Join us at one of the many climate action events throughout the state to help protect our planet and build sustainable communities.
Featured Events
California Biodiversity Day – September 7th
California Biodiversity Day is a statewide celebration that encourages all Californians to explore, appreciate, and help protect our incredible biodiversity. Organizations and individuals across the state host activities throughout the week, including guided nature walks, cultural demonstrations, restoration projects, art activities, family-friendly games, bioblitzes, and more. California Biodiversity Day events and outreach efforts run from September 5–13. Sign up here!
California Coastal Cleanup Day – September 19th
California Coastal Cleanup Day is California’s largest volunteer event, where people help clean creeks, rivers, lakes, and beaches to protect our coast and ocean. Virtually all bodies of water in California eventually flow to the sea, cleanups anywhere in California make a difference. California Coastal Cleanup Day is organized by the California Coastal Commission with support from local partners and is part of the global International Coastal Cleanup led by the Ocean Conservancy. Sign up here!
LA Community Climate Action Day – September 26th
Community Climate Action Days are an opportunity for Californians to work on projects that will protect their communities against the harshest impacts of climate change while improving quality of life and access to green spaces. Community Climate Action Days are more than a community service event – it’s a celebration of all that makes California unique: our food, our culture, and our deep commitment to make our community safer, greener, and more resilient. Sign up here!
September 2026 Events
Use the search box: Find volunteer opportunities by entering your city or county name or search by date.
| Date | Organization | Event | 10:00 a.m. — 12:00 p.m. | City | County | Register |
|---|---|---|---|---|---|---|
| 9/2 | Gardens to Grow In | Gardens To Grow In Community Greening Event | 10:00 a.m. — 12:00 p.m. | San Andreas | Calaveras | Sign up |
| 9/3 | Canopy | Young Tree Care Survey: Virtual Training | 10:00 a.m. — 12:00 p.m. | Online | Online | Sign up |
| 9/4 | Canopy | Young Tree Care Survey Session (Morning) | 10:00 a.m. — 12:00 p.m. | Palo Alto | San Mateo | Sign up |
| 9/4 | Canopy | Young Tree Care Survey Session (Evening) | 10:00 a.m. — 12:00 p.m. | Palo Alto | San Mateo | Sign up |
| 9/5 | Amigos de los Rios | Greening the Rio Hondo Trail | 10:00 a.m. — 12:00 p.m. | Arcadia | Los Angeles | Sign up |
| 9/5 | Arrowhead United Way | Arrowhead United Way Advancing Clean Energy Goals in San Bernardino County Project | 10:00 a.m. — 12:00 p.m. | San Bernardino | San Bernardino | Sign up |
| 9/5 | San Diego Bird Alliance | San Diego Bird Alliance Wildfire Resiliency Day | 10:00 a.m. — 12:00 p.m. | Vista | San Diego | Sign up |
| 9/5 | PacOut Green Team | PacOut Green Team Waste Reduction Event | 10:00 a.m. — 12:00 p.m. | Fortuna | Humboldt | Sign up |
| 9/5 | Old North Sacramento Community Association | Old North Sacramento Community Association Community Greening Event | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/5 | Trinidad Coastal Land Trust | California Coastal Cleanup Month: Luffenholtz Beach | 10:00 a.m. — 12:00 p.m. | Trinidad | Humboldt | Sign up |
| 9/5 | Don Edwards San Francisco Bay National Wildlife Refuge | Are There Gray Foxes in Your Backyard? | 10:00 a.m. — 12:00 p.m. | Fremont | Alameda | Sign up |
| 9/5 | California Academy of Sciences, El Tímpano, Friends of Sausal Creek | Dimond Park Bioblitz | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/5 | Oakland Zoo | Oakland Zoo Biodiversity Day(s) | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/5 | American River Conservancy | Wakamatsu Farm BioBlitz | 10:00 a.m. — 12:00 p.m. | Placerville | El Dorado | Sign up |
| 9/5 | Friends of The Arcata Marsh | Saturday, September 5, 2 to 4 pm -- Paul Wilson with Species Richness | 10:00 a.m. — 12:00 p.m. | Arcata | Humboldt | Sign up |
| 9/5 | Tuleyome | Berryessa Snow Mountain National Monument Bioblitz | 10:00 a.m. — 12:00 p.m. | Clearlake Oaks | Lake | Sign up |
| 9/5 | National Parks Service and Santa Monica Mountains Fund | Labor Day Restoration Planting | 10:00 a.m. — 12:00 p.m. | Agoura Hills | Los Angeles | Sign up |
| 9/5 | California State Parks | Boardwalk BioBlitz at Doheny State Beach | 10:00 a.m. — 12:00 p.m. | Dana Point | Orange | Sign up |
| 9/5 | Amigos de Bolsa Chica | Celebrate Bolsa Chica's Biodiversity | 10:00 a.m. — 12:00 p.m. | Huntington Beach | Orange | Sign up |
| 9/5 | Back Bay Science Center (California Department of Fish and Wildlife) | Back Bay Science Center BioBlitz | 10:00 a.m. — 12:00 p.m. | Newport Beach | Orange | Sign up |
| 9/5 | Back Bay Science Center (California Department of Fish and Wildlife) | Biodiversity Bash! | 10:00 a.m. — 12:00 p.m. | Newport Beach | Orange | Sign up |
| 9/5 | California State Parks/CDFW | Biodiversity Week Kickoff | 10:00 a.m. — 12:00 p.m. | Folsom | Sacramento | Sign up |
| 9/5 | Transition Habitat Conservancy and San Gabriel Mountains Chapter California Native Plant Society | Moth Night and Constellation Station! | 10:00 a.m. — 12:00 p.m. | Lancaster | San Bernardino | Sign up |
| 9/5 | Bugologist | Expeditions: Moth Night! | 10:00 a.m. — 12:00 p.m. | Chula Vista | San Diego | Sign up |
| 9/5 | California State Parks | Junior Rangers: Beach Wrack- Biodiversity at the Beach! | 10:00 a.m. — 12:00 p.m. | Del Mar | San Diego | Sign up |
| 9/5 | Preserve Calavera | Birding at Buddy Todd Park | 10:00 a.m. — 12:00 p.m. | Oceanside | San Diego | Sign up |
| 9/5 | Radio Wilderness | Moth Night at Grant Park | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/5 | San Francisco Zoo and Gardens | Conserving California's Biodiversity @San Francisco Zoo | 10:00 a.m. — 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/5 | Presidio Trust | Presidio Biodiversity Portraits | 10:00 a.m. — 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/5 | Carpinteria Weed Warriors and the City of Carpinteria | Carpinteria Salt Marsh Nature Park Weed Day | 10:00 a.m. — 12:00 p.m. | Carpinteria | Santa Barbara | Sign up |
| 9/5 | The Nature Conservancy | Dangermond Preserve Community Bioblitz | 10:00 a.m. — 12:00 p.m. | Lompoc | Santa Barbara | Sign up |
| 9/5 | Western Shasta Resource Conservation District | Biodiversity Day Bonanza | 10:00 a.m. — 12:00 p.m. | Redding | Shasta | Sign up |
| 9/5 | Pepperwood Preserve | 30 Species Challenge at Pepperwood | 10:00 a.m. — 12:00 p.m. | Santa Rosa | Sonoma | Sign up |
| 9/6 | California State Parks | Ano Nuevo State Park Invasive Species Removal/Habitat Restoration Event | 10:00 a.m. — 12:00 p.m. | Pescadero | San Mateo | Sign up |
| 9/6 | Bolsa Chica Land Trust | Bolsa Chica Stewards Habitat Restoration Volunteering | 10:00 a.m. — 12:00 p.m. | Huntington Beach | Orange | Sign up |
| 9/6 | EcoPress Sacramento | EcoPress Sacramento Waste Reduction Event | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/6 | Friends of the Arcata Marsh | Find 30 Species with Paul Johnson and Lynn Jones | 10:00 a.m. — 12:00 p.m. | Arcata | Humboldt | Sign up |
| 9/6 | California State Parks - Capitol Museum | California Biodiversity Week Capitol Park Tour | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/6 | California State Parks | Capitol Park Bird Talk & Walk | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/6 | Solana Beach Eco Rotary Club | SMRT Garden Bioblitz | 10:00 a.m. — 12:00 p.m. | Del Mar | San Diego | Sign up |
| 9/6 | San Francisco Zoo and Gardens | Conserving California's Biodiversity at SF Zoo | 10:00 a.m. — 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/6 | Presidio Trust | Presidio Biodiversity Day Portraits | 10:00 a.m. — 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/6 | Sonoma Ecology Center | Soundscape Listening Walk | 10:00 a.m. — 12:00 p.m. | Kenwood | Sonoma | Sign up |
| 9/6 | San Benito Agricultural Land Trust | September Ranch Day | 10:00 a.m. — 12:00 p.m. | San Juan Bautista | San Benito | Sign up |
| 9/7 | Friends of the Arcata Marsh | Paul Johnson, “The mysterious and seldom-seen parts of biodiversity” | 10:00 a.m. — 12:00 p.m. | Arcata | Humboldt | Sign up |
| 9/7 | Sacramento Shasta Chapter of The Wildlife Society | California Biodiversity Day 2026 Sacramento-Shasta BioBlitz | 10:00 a.m. — 12:00 p.m. | Redding | Lassen | Sign up |
| 9/7 | Sierra Streams Institute | Deer Creek Tribute Trail Bioblitz | 10:00 a.m. — 12:00 p.m. | Nevada City | Nevada | Sign up |
| 9/7 | Sacramento Bird Alliance | Biodiversity Day at Bushy Lake | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/7 | Preserve Calavera | Bats and Moths Night | 10:00 a.m. — 12:00 p.m. | Oceanside | San Diego | Sign up |
| 9/7 | California State Parks | Quarry Trail Bioblitz in Morro Bay State Park | 10:00 a.m. — 11:00 p.m. | Morro Bay | San Luis Obispo | Sign up |
| 9/7 | California Native Plant Society Channel Islands and the City of Carpinteria | Rincon Bluffs Bioblitz | 10:00 a.m. — 12:00 p.m. | Carpinteria | Santa Barbara | Sign up |
| 9/7 | City of Woodland Weeding Volunteers | Get into the Weeds: Saving Local Biodiversity at Woodland Regional Park Preserve! | 10:00 a.m. — 12:00 p.m. | Woodland | Yolo | Sign up |
| 9/8 | San Diego River Park Foundation | San Diego River Mouth Habitat Restoration | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/8 | San Francisco State University Climate HQ | ClimateHQ Open House Fall 2026 | 10:00 a.m. — 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/8 | Environmental Center of San Luis Obispo (ECOSLO) | Johnson Ranch Open Space Maintenance Project | 10:00 a.m. — 12:00 p.m. | San Luis Obispo | San Luis Obispo | Sign up |
| 9/8 | Friends of the Arcata Marsh | Lynn Jones, “How do we increase and steward greater biodiversity?” | 10:00 a.m. — 12:00 p.m. | Arcata | Humboldt | Sign up |
| 9/8 | Friends of Ballona Wetlands | Grow Native! Gardening Club | 10:00 a.m. — 12:00 p.m. | Playa Vista | Los Angeles | Sign up |
| 9/8 | California State Parks | Hummingbirds & Flowers Guided Nature Walk | 10:30 a.m. — 11:30 p.m. | Los Osos | San Luis Obispo | Sign up |
| 9/9 | Early Kidney Detection Foundation | Early Kidney Detection Foundation Disaster Readiness & Waste Reduction Volunteer Day | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/9 | Friends of the Arcata Marsh | Elliott Dabill, “How to identify eight common Arcata Marsh plant families” Lecture | 10:00 a.m. — 12:00 p.m. | Arcata | Humboldt | Sign up |
| 9/9 | Habematolel Pomo of Upper Lake EPA | Cultivate and Discover | 10:00 a.m. — 12:00 p.m. | Upper Lake | Lake | Sign up |
| 9/9 | California State Parks | Point Lobos BioBlitz | 9:00 a.m. — 1:30 p.m. | Big Sur | Monterey | Sign up |
| 9/9 | University of California, Riverside | Wild California: Stories of Science, Water & Life | 10:00 a.m. — 12:00 p.m. | Riverside | Riverside | Sign up |
| 9/9 | SacSewer Bufferlands | Bufferlands Fall Migration and Habitat Tour | 10:00 a.m. — 12:00 p.m. | Elk Grove | Sacramento | Sign up |
| 9/9 | California State Parks - Capitol Museum | Biodiversity Week Capitol Park Tour | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/9 | California Native Plant Society Yerba Buena Chapter | Habitat Restoration at Balboa Natural Area | 10:00 a.m. — 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/10 | Canopy | Young Tree Care Survey: Virtual Training | 10:00 a.m. — 12:00 p.m. | Online | Online | Sign up |
| 9/10 | Friends of the Arcata Marsh | Barbara Reisman, “Introduction to lichens at the Marsh” | 10:00 a.m. — 12:00 p.m. | Arcata | Humboldt | Sign up |
| 9/10 | California State Parks | Clear Lake State Park Bioblitz | 10:00 a.m. — 12:00 p.m. | Kelseyville | Lake | Sign up |
| 9/10 | California State Parks | Poetry in the Parks: California Biodiversity Week | 6:00 p.m. — 8:00 p.m. | Monterey | Monterey | Sign up |
| 9/10 | CAL FIRE | Aspen and Meadow Restoration | 10:00 a.m. — 12:00 p.m. | Nevada City | Placer | Sign up |
| 9/10 | California State Parks | BioBlitz Under the Pines! | 10:00 a.m. — 12:00 p.m. | Del Mar | San Diego | Sign up |
| 9/10 | Sempervirens Fund | Guided Hike at Cotoni-Coast Dairies | 10:00 a.m. — 12:00 p.m. | Davenport | Santa Cruz | Sign up |
| 9/10 | Santa Cruz Bird Club | Slow Birding @ Heart of Soquel Park | 10:00 a.m. — 12:00 p.m. | Soquel | Santa Cruz | Sign up |
| 9/11 | Canopy | Young Tree Care Survey Session (Morning) | 10:00 a.m. — 12:00 p.m. | Palo Alto | San Mateo | Sign up |
| 9/11 | Canopy | Young Tree Care Survey Session (Evening) | 10:00 a.m. — 12:00 p.m. | Palo Alto | San Mateo | Sign up |
| 9/11 | Earth Discovery Institute | Twilight Bioblitz Hike | 10:00 a.m. — 12:00 p.m. | El Cajon | San Diego | Sign up |
| 9/11 | California State Parks | Coon Creek BioBlitz | 10:00 a.m. — 12:00 p.m. | Los Osos | San Luis Obispo | Sign up |
| 9/12 | Amigos de los Rios | Greening Monrovia High School | 10:00 a.m. — 12:00 p.m. | Monrovia | Los Angeles | Sign up |
| 9/12 | Growing Hope | Soil, Seedlings & Sustainability: Urban Farm Renewal Day | 10:00 a.m. — 12:00 p.m. | Santa Monica | Los Angeles | Sign up |
| 9/12 | Inland Empire Resource Conservation District | Latino Conservation Week: Milkweed Seed Collection and Community Celebration | 10:00 a.m. — 12:00 p.m. | Jurupa Valley | Riverside | Sign up |
| 9/12 | Our City Forest | Greening Tully Fields with Our City Forest! | 10:00 a.m. — 12:00 p.m. | San Jose | Santa Clara | Sign up |
| 9/12 | Santa Clara County Parks | Hellyer Weeding Party | 10:00 a.m. — 12:00 p.m. | San Jose | Santa Clara | Sign up |
| 9/12 | Reuse Alliance | Fairfax Repair Fair | 10:00 a.m. — 12:00 p.m. | Fairfax | Marin | Sign up |
| 9/12 | Sacramento Valley Conservancy | Volunteer Service Day at Camp Pollock | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/12 | Canopy | Young Tree Care Survey Session | 10:00 a.m. — 12:00 p.m. | Palo Alto | San Mateo | Sign up |
| 9/12 | Conservation Works | Second Saturdays Stewardship | 10:00 a.m. — 12:00 p.m. | Fort Bragg | Mendocino | Sign up |
| 9/12 | Active San Gabriel Valley | Monrovia: Community Bike Audit Ride! | 10:00 a.m. — 12:00 p.m. | Monrovia | Los Angeles | Sign up |
| 9/12 | Amigos de los Rios | Greening Jackson Elementary - Site Care | 10:00 a.m. — 12:00 p.m. | Altadena | Los Angeles | Sign up |
| 9/12 | National Health Foundation | National Health Foundation Community Greening Event | 10:00 a.m. — 12:00 p.m. | Los Angeles | Los Angeles | Sign up |
| 9/12 | I Dig Calaveras | Volunteer to Build a Worm Bin and Bug Hotel at Calaveras Master Gardener Demonstration Garden | 10:00 a.m. — 12:00 p.m. | San Andreas | Calaveras | Sign up |
| 9/12 | Wildlands Conservancy | California Coastal Cleanup Month: Centerville Beach | 10:00 a.m. — 12:00 p.m. | Ferndale | Humboldt | Sign up |
| 9/12 | Six Rivers Solar and Eureka Natural Foods | California Coastal Cleanup Month: Clam Beach | 10:00 a.m. — 12:00 p.m. | Trinidad | Humboldt | Sign up |
| 9/12 | Shasta-Trinity National Forest | California Coastal Cleanup Month: Trinity River Clean-up | 10:00 a.m. — 12:00 p.m. | Weaverville | Trinity | Sign up |
| 9/12 | Port of Oakland | East Creek Slough (inside MLK Jr. Regional Shoreline Park) | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/12 | Livermore Area Recreation and Park District | California Biodiversity Day Bioblitz @ Sycamore Grove | 10:00 a.m. — 12:00 p.m. | Livermore | Alameda | Sign up |
| 9/12 | California State Parks | 2026 Tahoe Bear Fest | 10:00 a.m. — 12:00 p.m. | Tahoma | El Dorado | Sign up |
| 9/12 | United Indian Health Services, Inc. | Potawot Biodiversity Volunteer Event | 10:00 a.m. — 12:00 p.m. | Arcata | Humboldt | Sign up |
| 9/12 | Desert Tortoise Preserve Committee | Nighttime Bioblitz | 10:00 a.m. — 12:00 p.m. | California City | Kern | Sign up |
| 9/12 | California State Parks | Malibu Creek State Park Biodiversity Pop-Up | 10:00 a.m. — 12:00 p.m. | Calabasas | Los Angeles | Sign up |
| 9/12 | Arroyos & Foothills Conservancy | Native Plant Walk: Summer Dormancy | 10:00 a.m. — 12:00 p.m. | Glendale | Los Angeles | Sign up |
| 9/12 | Friends of Ballona Wetlands | Freshwater Marsh Tour / Caminata Bilingue Por Nuestra Marisma de Agua Dulce | 10:00 a.m. — 12:00 p.m. | Playa Vista | Los Angeles | Sign up |
| 9/12 | Jackson Demonstration State Forest | Owl Discovery Night | 10:00 a.m. — 12:00 p.m. | Comptche | Mendocino | Sign up |
| 9/12 | California Department of Fish & Wildlife | Nature Fiesta! | 10:00 a.m. — 12:00 p.m. | Royal Oaks | Monterey | Sign up |
| 9/12 | City of Costa Mesa | Biodiversity Through Books! | 10:00 a.m. — 12:00 p.m. | Costa Mesa | Orange | Sign up |
| 9/12 | 350 Elk Grove / City of Elk Grove | Biodiversity Chalkout | 10:00 a.m. — 12:00 p.m. | Elk Grove | Sacramento | Sign up |
| 9/12 | Cosumnes River Preserve | Biodiversity Guided Walk at the Cosumnes River Preserve | 10:00 a.m. — 12:00 p.m. | Galt | Sacramento | Sign up |
| 9/12 | Sacramento Valley Conservancy | Native Plant Service Day | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/12 | CactusToCloud Institute | Field Sketching and Nature Journaling at Big Morongo Canyon Preserve | 10:00 a.m. — 12:00 p.m. | Morongo Valley | San Bernardino | Sign up |
| 9/12 | Bugologist / Scales & Origins | Expeditions: Reptiles & Bugs Hike | 10:00 a.m. — 12:00 p.m. | Imperial Beach | San Diego | Sign up |
| 9/12 | San Diego River Park Foundation | San Diego River Gorge Overlook Hike | 10:00 a.m. — 12:00 p.m. | Julian | San Diego | Sign up |
| 9/12 | California State Parks | The Birds of Cuyamaca Rancho State Park with John Lovio | 10:00 a.m. — 12:00 p.m. | Julian | San Diego | Sign up |
| 9/12 | San Diego Bird Alliance, in partnership with The Nat, USFWS, SDCK and UC San Diego Natural Reserve System | Latino Conservation Week: Wander the Wetlands special event (Bilingual) | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/12 | Friends of Rose Creek | Rose Creek BioBlitz | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/12 | California Academy of Sciences | Ocean Beach Bioblitz | 10:00 a.m. — 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/12 | Cayucos Land Conservancy | Cayucos Land Conservancy (CLC) - Estero Bluffs Biodiversity Week - 2026 | 10:00 a.m. — 12:00 p.m. | Cayucos | San Luis Obispo | Sign up |
| 9/12 | San Francisco Bay Wildlife Society, Don Edwards San Francisco Bay National Wildlife Refuge, Santa Clara Valley Urban Runoff Pollution Prevention Program | Beginning Bird Watching | 10:00 a.m. — 12:00 p.m. | Alviso | Santa Clara | Sign up |
| 9/12 | Keep Coyote Creek Beautiful | Shady Oaks BioBlitz | 10:00 a.m. — 12:00 p.m. | San Jose | Santa Clara | Sign up |
| 9/12 | Santa Cruz Bird Club, Coastal Watershed Council, Santa Cruz Natural History Museum, Monterey Bay Salmon and Trout Project | San Lorenzo River Natural/Cultural History Walk | 10:00 a.m. — 12:00 p.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/12 | UC Nature | Younger Lagoon Reserve Free Beach Tour | 10:00 a.m. — 12:00 p.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/12 | California State Parks | BioBlitz at Sonoma Developmental Center (SDC) Open Space | 10:00 a.m. — 12:00 p.m. | Eldridge | Sonoma | Sign up |
| 9/12 | Tule River Parkway Association | Biodiversity Nature Bingo | 10:00 a.m. — 12:00 p.m. | Porterville | Tulare | Sign up |
| 9/12 | UC Davis Student Farm | UC Davis Student Farm Bioblitz | 10:00 a.m. — 12:00 p.m. | Davis | Yolo | Sign up |
| 9/12 | San Francisco Environment Department | Sunset Dunes Bioblitz | 10:00 a.m. — 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/12 | San Francisco Environment Department | Sunset Dunes Bioblitz | 10:00 a.m. — 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/12 | Planet Bee Foundation | Bee and Plant Habitat Restoration Day with Planet Bee Foundation | 10:00 a.m. — 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/13 | U.S. Fish and Wildlife Service | Birds, Bugs & Biodiversity: A Bilingual Binational Bioblitz | 10:00 a.m. — 12:00 p.m. | Imperial Beach | San Diego | Sign up |
| 9/13 | U.S. Fish and Wildlife Service | Planting Party at Tijuana Slough National Wildlife Refuge | 10:00 a.m. — 12:00 p.m. | Imperial Beach | San Diego | Sign up |
| 9/13 | Santa Clara County Parks | Viva Calle Event Support | 10:00 a.m. — 12:00 p.m. | San Jose | Santa Clara | Sign up |
| 9/13 | Active San Gabriel Valley | Learn to Bike Class in El Monte - Beginner Friendly! | 10:00 a.m. — 12:00 p.m. | El Monte | Los Angeles | Sign up |
| 9/13 | Amigos de los Rios | Greening Willard Elementary School - Site Care | 10:00 a.m. — 12:00 p.m. | Pasadena | Los Angeles | Sign up |
| 9/13 | San Diego Bird Alliance | San Diego Bird Alliance Community Greening Event | 10:00 a.m. — 12:00 p.m. | Imperial Beach | San Diego | Sign up |
| 9/13 | Northcoast Environmental Center | California Coastal Cleanup Month: Arcata Marsh | 10:00 a.m. — 12:00 p.m. | Arcata | Humboldt | Sign up |
| 9/13 | Monterey Audubon Society | Beginning Birding at Asilomar | 10:00 a.m. — 12:00 p.m. | Pacific Grove | Monterey | Sign up |
| 9/13 | Laguna Ocean Foundation | End of Summer BioBlast | 10:00 a.m. — 12:00 p.m. | Laguna Beach | Orange | Sign up |
| 9/13 | Laguna Ocean Foundation | Laguna Ocean Foundation - End of Summer BioBlast | 10:00 a.m. — 12:00 p.m. | Laguna Beach | Orange | Sign up |
| 9/13 | California Department of Fish & Wildlife | Bird Walk Along the American River | 10:00 a.m. — 12:00 p.m. | Gold River | Sacramento | Sign up |
| 9/13 | California State Parks - Capitol Museum | California Biodiversity Capitol Park Tour | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/13 | California State Parks, Leland Stanford Mansion SHP | Pollinators in Parks at Leland Stanford Mansion | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/13 | California Department of Fish and Wildlife and Cosumnes River Preserve | Bat Chat for California Biodiversity Day | 10:00 a.m. — 12:00 p.m. | Walnut Grove | Sacramento | Sign up |
| 9/13 | San Diego Bird Alliance, San Diego Natural History Museum, U.S. Fish and Wildlife Service, California State Parks Tijuana River National Estuarine Research Reserve | Birds, Bugs & Biodiversity: A Binational Bioblitz | 10:00 a.m. — 12:00 p.m. | Imperial Beach | San Diego | Sign up |
| 9/13 | San Francisco Bay Wildlife Society, San Mateo County Bird Alliance, Don Edwards San Francisco Bay National Wildlife Refuge | Bird Walk at Pond SF2 | 10:00 a.m. — 12:00 p.m. | Menlo Park | San Mateo | Sign up |
| 9/15 | Feeding San Diego | Feeding San Diego's Food Recovery Event | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/15 | Feeding San Diego | Feeding San Diego's Food Recovery Event | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/15 | Feeding San Diego | Feeding San Diego's Food Recovery Event | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/17 | Reuse Alliance | It's Not Trash: Reclaiming and Transforming | 10:00 a.m. — 12:00 p.m. | Petaluma | Sonoma | Sign up |
| 9/17 | Alturas Sunrise Rotary | Alturas Sunrise Rotary Community Greening Event | 10:00 a.m. — 12:00 p.m. | Alturas | Modoc | Sign up |
| 9/17 | Upper Merced River Watershed Council | Great Sierra River Cleanup | 10:00 a.m. — 12:00 p.m. | Mariposa | Mariposa | Sign up |
| 9/18 | Agua Hedionda Lagoon Foundation | Trail Restoration - Hubbs Trail | 10:00 a.m. — 12:00 p.m. | Carlsbad | San Diego | Sign up |
| 9/19 | San Diego River Park Foundation | San Diego River Park Foundation Waste Reduction Event | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | Amigos de los Rios | Greening Plymouth Elementary | 10:00 a.m. — 12:00 p.m. | Monrovia | Los Angeles | Sign up |
| 9/19 | Los Padres Forest Association | Los Padres Forest Association Discovering Nature Event | 10:00 a.m. — 12:00 p.m. | Santa Paula | Ventura | Sign up |
| 9/19 | Coastal Corridor Alliance | Special Beach Cleanup - CA Coastal Cleanup Day | 10:00 a.m. — 12:00 p.m. | Newport Beach | Orange | Sign up |
| 9/19 | I Heart Oakland-Alameda Estuary | California Coastal/Creek to Bay Day JLAC & Estuary Shore Cleanup | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Benicia Tree Foundation | Tree Care Day | 10:00 a.m. — 12:00 p.m. | Benicia | Solano | Sign up |
| 9/19 | Living Arroyos (via Alameda County Resource Conservation District) | California Coastal Cleanup Day | 10:00 a.m. — 12:00 p.m. | Livermore, Dublin, Pleasanton | Alameda | Sign up |
| 9/19 | OC Habitats | Coastal Clean Up Day | 10:00 a.m. — 12:00 p.m. | Huntington Beach | Orange | Sign up |
| 9/19 | Santa Clara County Parks | California Coastal Cleanup Day | 10:00 a.m. — 12:00 p.m. | San Jose, Cupertino, Morgan Hill, Gilroy | Santa Clara | Sign up |
| 9/19 | City of Santa Clarita | City of Santa Clarita Environmental Expo | 10:00 a.m. — 12:00 p.m. | Santa Clarita | Los Angeles | Sign up |
| 9/19 | Agua Hedionda Lagoon Foundation | Trail Restoration - Hubbs Trail | 10:00 a.m. — 12:00 p.m. | Carlsbad | San Diego | Sign up |
| 9/19 | Reuse Alliance | Healdsburg Repair Fair | 10:00 a.m. — 12:00 p.m. | Healdsburg | Sonoma | Sign up |
| 9/19 | Reuse Alliance | Bookbinding 101: Hardbound Book | 10:00 a.m. — 12:00 p.m. | Petaluma | Sonoma | Sign up |
| 9/19 | I Love A Clean San Diego | 42nd Annual Coastal Cleanup Day | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | Butte Environmental Council | 39th Annual Bidwell Park and Chico Creeks Cleanup | 10:00 a.m. — 12:00 p.m. | Chico | Butte | Sign up |
| 9/19 | Canopy | Celebrate Together: Latino Conservation Week with Canopy and Hope Horizon | Celebremos juntos: la Semana de la Conservación Latina con Canopy y Hope Horizon | 10:00 a.m. — 12:00 p.m. | East Palo Alto | San Mateo | Sign up |
| 9/19 | The Watershed Project | Coastal Cleanup Day at Shimada Friendship Park | 10:00 a.m. — 12:00 p.m. | Richmond | Contra Costa | Sign up |
| 9/19 | Heal the Bay | Heal the Bay Presents The 37th Annual Coastal Cleanup Day | 10:00 a.m. — 12:00 p.m. | Various | Los Angeles | Sign up |
| 9/19 | Bolsa Chica Land Trust | Bolsa Chica Stewards Habitat Restoration Volunteering | 10:00 a.m. — 12:00 p.m. | Huntington Beach | Orange | Sign up |
| 9/19 | Pacific Beach Coalition | California Coastal Cleanup Day | 10:00 a.m. — 12:00 p.m. | Various | San Mateo | Sign up |
| 9/19 | I Love A Clean San Diego | Coastal Clean Up day with I Love A Clean San Diego | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | Early Kidney Detection Foundation | Early Kidney Detection Foundation Disaster Readiness & Waste Reduction Volunteer Day | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/19 | River District | River Districts Community Greening Event | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/19 | Huntington Beach Wetlands Conservancy | Huntington Beach Wetlands Conservancy Coastal Clean Up Day | 10:00 a.m. — 12:00 p.m. | Huntington Beach | Orange | Sign up |
| 9/19 | LA Waterkeeper | LA Waterkeeper Waste Reduction Event | 10:00 a.m. — 12:00 p.m. | Long Beach | Los Angeles | Sign up |
| 9/19 | Arroyos & Foothills Conservancy | Arroyos & Foothills Conservancy Community Greening Event | 10:00 a.m. — 12:00 p.m. | Glendale | Los Angeles | Sign up |
| 9/19 | Hearts of Gold | Hearts of Gold Coastal Cleanup and Watershed Education Day | 10:00 a.m. — 12:00 p.m. | San Juan Capistrano | Orange | Sign up |
| 9/19 | San Francisco Baykeeper | San Francisco Baykeeper Water Quality Day | 10:00 a.m. — 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/19 | FoodCycle | Foodcycles Food Recovery Event | 10:00 a.m. — 12:00 p.m. | Culver City | Los Angeles | Sign up |
| 9/19 | Resilient Palisades | Resilient Palisades Wildfire Resiliency Event | 10:00 a.m. — 12:00 p.m. | Pacific Palisades | Los Angeles | Sign up |
| 9/19 | Inland Empire Waterkeeper | Inland Empire Waterkeeper Community Greening Event | 10:00 a.m. — 12:00 p.m. | Riverside | Riverside | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | 19th Annual Creeks to Coast Cleanup | 10:00 a.m. — 12:00 p.m. | San Luis Obispo | San Luis Obispo | Sign up |
| 9/19 | City of Berkeley | Coastal Cleanup Day Brickyard Cove | 10:00 a.m. — 12:00 p.m. | Berkeley | Alameda | Sign up |
| 9/19 | Garber Park Stewards | Coastal Cleanup Day Garber Park | 10:00 a.m. — 12:00 p.m. | Berkeley | Alameda | Sign up |
| 9/19 | City of Berkeley | Coastal Cleanup Day Shorebird Park Nature Center | 10:00 a.m. — 12:00 p.m. | Berkeley | Alameda | Sign up |
| 9/19 | Alameda County Resource Conservation District | California Coastal Cleanup Day @ Dublin Creek | 10:00 a.m. — 12:00 p.m. | Dublin | Alameda | Sign up |
| 9/19 | City of Emeryville | Emeryville Coastal Cleanup 2026 | 10:00 a.m. — 12:00 p.m. | Emeryville | Alameda | Sign up |
| 9/19 | City of Fremont, Environmental Services Division | Coastal Cleanup Day: Almond Ave. & Lee St., Fremont | 10:00 a.m. — 12:00 p.m. | Fremont | Alameda | Sign up |
| 9/19 | City of Fremont, Environmental Services Division | Coastal Cleanup Day: Crandall Creek, at Deep Creek Rd. | 10:00 a.m. — 12:00 p.m. | Fremont | Alameda | Sign up |
| 9/19 | City of Fremont, Environmental Services Division | Coastal Cleanup Day: Delaware Dr. and Sumter Ave., Fremont | 10:00 a.m. — 12:00 p.m. | Fremont | Alameda | Sign up |
| 9/19 | City of Fremont, Environmental Services Division | Coastal Cleanup Day: Central Park | 10:00 a.m. — 12:00 p.m. | Fremont | Alameda | Sign up |
| 9/19 | City of Fremont, Environmental Services Division | Coastal Cleanup Day: Crandall Creek | 10:00 a.m. — 12:00 p.m. | Fremont | Alameda | Sign up |
| 9/19 | City of Fremont, Environmental Services Division | Coastal Cleanup Day: Fremont Central Park | 10:00 a.m. — 12:00 p.m. | Fremont | Alameda | Sign up |
| 9/19 | City of Fremont, Environmental Services Division | Coastal Cleanup Day: Grimmer Blvd. and Blacow Rd., Fremont | 10:00 a.m. — 12:00 p.m. | Fremont | Alameda | Sign up |
| 9/19 | City of Fremont, Environmental Services Division | Coastal Cleanup Day: Hastings St., Fremont | 10:00 a.m. — 12:00 p.m. | Fremont | Alameda | Sign up |
| 9/19 | City of Fremont, Environmental Services Division | Coastal Cleanup Day: Roberts Ave. and Carol Ave. | 10:00 a.m. — 12:00 p.m. | Fremont | Alameda | Sign up |
| 9/19 | City of Fremont, Environmental Services Division | Coastal Cleanup Day: Sorting Stewards (Central Park ) | 10:00 a.m. — 12:00 p.m. | Fremont | Alameda | Sign up |
| 9/19 | City of Fremont, Environmental Services Division | Coastal Cleanup Day: Sorting Stewards (Crandall Creek) | 10:00 a.m. — 12:00 p.m. | Fremont | Alameda | Sign up |
| 9/19 | City of Fremont, Environmental Services Division | Coastal Cleanup Day: Sorting Stewards | 10:00 a.m. — 12:00 p.m. | Fremont | Alameda | Sign up |
| 9/19 | City of Fremont, Environmental Services Division | Coastal Cleanup Day: Sorting Stewards | 10:00 a.m. — 12:00 p.m. | Fremont | Alameda | Sign up |
| 9/19 | City of Fremont, Environmental Services Division | Coastal Cleanup Day: Tule Ponds South, Fremont (Site T) | 10:00 a.m. — 12:00 p.m. | Fremont | Alameda | Sign up |
| 9/19 | Alameda County Resource Conservation District | Coastal Cleanup Day: Altamont Creek and Arroyo Las Positas at Bluebell Dr | 10:00 a.m. — 12:00 p.m. | Livermore | Alameda | Sign up |
| 9/19 | Alameda County Resource Conservation District | Coastal Cleanup Day: Arroyo Las Positas at Northfront Rd | 10:00 a.m. — 12:00 p.m. | Livermore | Alameda | Sign up |
| 9/19 | Alameda County Resource Conservation District | Coastal Cleanup Day: Arroyo Mocho at Robertson Park | 10:00 a.m. — 12:00 p.m. | Livermore | Alameda | Sign up |
| 9/19 | Carmen Flores Recreation Center | Creek to Bay Day: Carmen Flores - Josie de la Cruz Education Garden | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Melrose 27X Neighborhood Council | Creek to Bay Day: Courtland Creek Park | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Friends of Sausal Creek | Creek to Bay Day: Courtland Creek Park:Dimond Canyon / Park | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Friends of Dimond Park | Creek to Bay Day: Dimond Park | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Friends of Sausal Creek | Creek to Bay Day: Fern Ravine | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | City of Oakland - OPRYD FM Smith | Creek to Bay Day: FM Smith Recreation Center/Park | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Friends of Glen Echo Park-PANIL | Creek to Bay Day: Glen Echo Park | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Hope Avenue | Hope Avenue | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | I Heart Oakland Alameda Estuary | IHOAE -Jack London Aquatic Center and Estuary Park Clean-up | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Jingletown Art Business & Community | Creek to Bay Day: Jingletown | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Joaquin Miller Open Space Stewards | Creek to Bay Day: JM Open Space & Overlook Gateway | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Friends of Jungle Hill | Creek to Bay Day: Jungle Hill | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | OKNIA.org (Oak Knoll Neighborhood Improvment Association) | Creek to Bay Day: King Estate Open Spacer | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Friends of Arroyo Viejo Creek | Knowland Park Cleanup | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Lake Merritt Institute | Creek to Bay Day: Lake Merritt Boating Institute | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Oakland, Parks, Recreation, & Youth Development | Creek to Bay Day: Lake Merritt Boating Center | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Lake Merritt Conservancy | Lakeside Park Snack Shack | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Piedmont Pines Neighborhood Association | Creek to Bay Day: Marjorie Saunders Park | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Nurture NATURE & Port of Oakland | Middle Harbor Shoreline Park | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Nurture NATURE | Middle Harbor Shoreline Park | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Friends of Sausal Creek | Monterey Redwoods | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Mosswood Recreation Center - City of Oakland | Creek to Bay Day: Mosswood Recreation Center | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Richmond Blvd Neighborhood Association | Creek to Bay Day: Oak Glen Park | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Diamond Equine Services | Creek to Bay Day: Oakland City Stables | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Oakland Don’t Play | Oakland Don’t Play | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Frontline Catalysts | Peralta Hacienda Historical Park | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Rockridge Temescal Greenbelt - FROG Park Committee | Creek to Bay Day: Rockridge Temescal Greenbelt - FROG Park | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Sacred Heart Oakland / Missionary Oblates | Creek to Bay Day: Sacred Heart Church | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Rotary Nature Center Friends | Creek to Bay Day: Sailboat House Marsh | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Friends of Sausal Creek | Sausal Creek Preserve | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | The Crucible | Creek to Bay Day: The Crucible | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Friends of The Gardens at Lake Merritt | The Gardens at Lake Merritt | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Community Rich | Creek to Bay Day: Warming Shelters Build - Community Rich | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Friends of Joaquin Miller Park | Creek to Bay Day: Woodminster Cascade | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Oakland Parks, Recreation & Youth Development | Davie Tennis Stadium | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | City of San Leandro - Recreation and Parks | San Leandro Marina Park | 10:00 a.m. — 12:00 p.m. | San Leandro | Alameda | Sign up |
| 9/19 | East Bay Regional Park District | California Coastal Cleanup: Robert W. Crown Regional Shoreline | 10:00 a.m. — 12:00 p.m. | Alameda | Alameda | Sign up |
| 9/19 | East Bay Regional Park District | California Coastal Cleanup: Pt. Isabel Regional Shoreline, end of Rydin Rd. | 10:00 a.m. — 12:00 p.m. | Richmond | Alameda | Sign up |
| 9/19 | East Bay Regional Park District | California Coastal Cleanup: Quarry Lakes Regional Recreation Area | 10:00 a.m. — 12:00 p.m. | Fremont | Alameda | Sign up |
| 9/19 | East Bay Regional Park District | California Coastal Cleanup: Hayward Regional Shoreline | 10:00 a.m. — 12:00 p.m. | Hayward | Alameda | Sign up |
| 9/19 | East Bay Regional Park District | California Coastal Cleanup: Del Valle Regional Park | 10:00 a.m. — 12:00 p.m. | Livermore | Alameda | Sign up |
| 9/19 | East Bay Regional Park District | California Coastal Cleanup Day: Martin Luther King Jr. Regional Shoreline | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Alpine Watershed Group | Alpine Watershed Group Creek Day 2026 | 10:00 a.m. — 12:00 p.m. | Markleeville | Alpine | Sign up |
| 9/19 | Foothill Conservancy | 2026 Mokelumne River Cleanup | 10:00 a.m. — 12:00 p.m. | Jackson | Amador | Sign up |
| 9/19 | Butte Environmental Council | 39th Annual Bidwell Park and Chico Creeks Cleanup | 10:00 a.m. — 12:00 p.m. | Chico | Butte | Sign up |
| 9/19 | The Watershed Project | Coastal Cleanup Day at the Albany Bulb | 10:00 a.m. — 12:00 p.m. | Albany | Contra Costa | Sign up |
| 9/19 | Volunteer Services East Bay Regional Park District | Bay Point Regional Shoreline: Coastal Cleanup 2026 | 10:00 a.m. — 12:00 p.m. | Bay Point | Contra Costa | Sign up |
| 9/19 | City of Concord and Friends of Concord Creeks | California Coastal Cleanup Day: Newhall Community Park | 10:00 a.m. — 12:00 p.m. | Concord | Contra Costa | Sign up |
| 9/19 | Contra Costa Resource Conservation District | California Coastal Cleanup Day: Crockett Waterfront | 10:00 a.m. — 12:00 p.m. | Crockett | Contra Costa | Sign up |
| 9/19 | City of El Cerrito | California Coastal Cleanup Day: Creekside Park | 10:00 a.m. — 12:00 p.m. | El Cerrito | Contra Costa | Sign up |
| 9/19 | John Muir Land Trust | California Coastal Cleanup Day: Pacheco Marsh | 10:00 a.m. — 12:00 p.m. | Martinez | Contra Costa | Sign up |
| 9/19 | Martinez Marina | California Coastal Cleanup Day: Martinez Marina | 10:00 a.m. — 12:00 p.m. | Martinez | Contra Costa | Sign up |
| 9/19 | City of Pinole | California Coastal Cleanup Day: Bayfront Park | 10:00 a.m. — 12:00 p.m. | Pinole | Contra Costa | Sign up |
| 9/19 | Pittsburg Marina | California Coastal Cleanup Day: Pittsburg Marina | 10:00 a.m. — 12:00 p.m. | Pittsburg | Contra Costa | Sign up |
| 9/19 | East Bay Trash Pandas | California Coastal Cleanup Day: Albany Marsh | 10:00 a.m. — 12:00 p.m. | Richmond | Contra Costa | Sign up |
| 9/19 | Groundwork Richmond | California Coastal Cleanup Day: Lucretia Edwards Shoreline Park | 10:00 a.m. — 12:00 p.m. | Richmond | Contra Costa | Sign up |
| 9/19 | The Watershed Project and Urban Tilth | California Coastal Cleanup Day: Wildcat Creek | 10:00 a.m. — 12:00 p.m. | Richmond | Contra Costa | Sign up |
| 9/19 | Contra Costa Resource Conservation District | California Coastal Cleanup Day: Lower Rodeo Creek | 10:00 a.m. — 12:00 p.m. | Rodeo | Contra Costa | Sign up |
| 9/19 | East Bay Regional Park District | California Coastal Cleanup Day: Bay Point Regional Shoreline | 10:00 a.m. — 12:00 p.m. | Bay Point | Contra Costa | Sign up |
| 9/19 | East Bay Regional Park District | California Coastal Cleanup Day: Radke Martinez Regional Shoreline | 10:00 a.m. — 12:00 p.m. | Martinez | Contra Costa | Sign up |
| 9/19 | East Bay Regional Park District | California Coastal Cleanup Day: Point Pinole Regional Shoreline | 10:00 a.m. — 12:00 p.m. | Richmond | Contra Costa | Sign up |
| 9/19 | American River Conservancy | Great Sierra River Cleanup: Marshall Gold Discovery | 10:00 a.m. — 12:00 p.m. | Coloma | El Dorado | Sign up |
| 9/19 | American River Conservancy | Great Sierra River Cleanup: Henningsen Lotus Park | 10:00 a.m. — 12:00 p.m. | Lotus | El Dorado | Sign up |
| 9/19 | American River Conservancy | Great Sierra River Cleanup: Greenwood Creek River Access | 10:00 a.m. — 12:00 p.m. | Pilot Hill | El Dorado | Sign up |
| 9/19 | American River Conservancy | Great Sierra River Cleanup: Happy Valley | 10:00 a.m. — 12:00 p.m. | Placerville | El Dorado | Sign up |
| 9/19 | Keep Tahoe Blue | Great Sierra River Cleanup: Pope Beach | 10:00 a.m. — 12:00 p.m. | South Lake Tahoe | El Dorado | Sign up |
| 9/19 | Humboldt Bay Aquatic Center and Surf Rider | Coastal Cleanup Month: Eureka Waterfront and Kayaking to Tuluwat Island | 10:00 a.m. — 12:00 p.m. | Eureka | Humboldt | Sign up |
| 9/19 | Peninsula Community Collaborative (and Redwood Community Action Agency) | Coastal Cleanup Month: Samoa and Fairhaven | 10:00 a.m. — 12:00 p.m. | Samoa | Humboldt | Sign up |
| 9/19 | Lake County Watershed Protection District | California Coastal Cleanup Day: Austin Beach | 10:00 a.m. — 12:00 p.m. | Clearlake | Lake | Sign up |
| 9/19 | Lake County Watershed Protection District | California Coastal Cleanup Day: Kelsey Creek | 10:00 a.m. — 12:00 p.m. | Kelseyville | Lake | Sign up |
| 9/19 | Lake County Watershed Protection District | California Coastal Cleanup Day: Highland Springs | 10:00 a.m. — 12:00 p.m. | Lakeport | Lake | Sign up |
| 9/19 | Lake County Watershed Protection District | California Coastal Cleanup Day: Library Park/ LKPT | 10:00 a.m. — 12:00 p.m. | Lakeport | Lake | Sign up |
| 9/19 | Lake County Watershed Protection District | California Coastal Cleanup Day: Rodman Slough | 10:00 a.m. — 12:00 p.m. | Lakeport | Lake | Sign up |
| 9/19 | Lake County Watershed Protection District | California Coastal Cleanup Day: Lucerne Harbor | 10:00 a.m. — 12:00 p.m. | Lucerne | Lake | Sign up |
| 9/19 | Lake County Watershed Protection District | California Coastal Cleanup Day: Bachelor Valley Grange #667 | 10:00 a.m. — 12:00 p.m. | Upper Lake | Lake | Sign up |
| 9/19 | California State Parks | California Coastal Cleanup Day: Malibu Creek State Park | 10:00 a.m. — 12:00 p.m. | Calabasas | Los Angeles | Sign up |
| 9/19 | Sierra Club, AKA | California Coastal Cleanup Day: Baldwin Hills Scenic Overlook Base | 10:00 a.m. — 12:00 p.m. | Culver City | Los Angeles | Sign up |
| 9/19 | Bike Culver City | California Coastal Cleanup Day: Ballona Creek Bike Path - Duquesne Ave. | 10:00 a.m. — 12:00 p.m. | Culver City | Los Angeles | Sign up |
| 9/19 | Ballona Creek Renaissance (BCR) | California Coastal Cleanup Day: Ballona Creek Bike Path - Overland Ave. | 10:00 a.m. — 12:00 p.m. | Culver City | Los Angeles | Sign up |
| 9/19 | Kiwanis Club of Los Angeles | California Coastal Cleanup Day: Ballona Creek Bike Path - Sepulveda Blvd | 10:00 a.m. — 12:00 p.m. | Culver City | Los Angeles | Sign up |
| 9/19 | ECHO HORIZON | California Coastal Cleanup Day: Ballona Creek Bike Path - Syd Kronenthal Park | 10:00 a.m. — 12:00 p.m. | Culver City | Los Angeles | Sign up |
| 9/19 | Bell Gardens High School | California Coastal Cleanup Day: Dockweiler State Beach - El Segundo Beach | 10:00 a.m. — 12:00 p.m. | El Segundo | Los Angeles | Sign up |
| 9/19 | City of Hermosa Beach | California Coastal Cleanup Day: Hermosa Beach - Pier | 10:00 a.m. — 12:00 p.m. | Hermosa Beach | Los Angeles | Sign up |
| 9/19 | AKA | California Coastal Cleanup Day: Apollo Community Regional Park | 10:00 a.m. — 12:00 p.m. | Lancaster | Los Angeles | Sign up |
| 9/19 | City of Long Beach | California Coastal Cleanup Day: 72nd Pl. and East Ocean Blvd. | 10:00 a.m. — 12:00 p.m. | Long Beach | Los Angeles | Sign up |
| 9/19 | City of Long Beach | California Coastal Cleanup Day: Alamitos Beach | 10:00 a.m. — 12:00 p.m. | Long Beach | Los Angeles | Sign up |
| 9/19 | City of Long Beach | California Coastal Cleanup Day: Belmont Pier | 10:00 a.m. — 12:00 p.m. | Long Beach | Los Angeles | Sign up |
| 9/19 | City of Long Beach | California Coastal Cleanup Day: Bluff Park Neighborhood Association | 10:00 a.m. — 12:00 p.m. | Long Beach | Los Angeles | Sign up |
| 9/19 | City of Long Beach | California Coastal Cleanup Day: Junipero Beach | 10:00 a.m. — 12:00 p.m. | Long Beach | Los Angeles | Sign up |
| 9/19 | City of Long Beach | California Coastal Cleanup Day: MacArthur Park | 10:00 a.m. — 12:00 p.m. | Long Beach | Los Angeles | Sign up |
| 9/19 | City of Long Beach | California Coastal Cleanup Day: Mother's Beach | 10:00 a.m. — 12:00 p.m. | Long Beach | Los Angeles | Sign up |
| 9/19 | City of Long Beach | California Coastal Cleanup Day: Rainbow Harbor | 10:00 a.m. — 12:00 p.m. | Long Beach | Los Angeles | Sign up |
| 9/19 | City of Long Beach | California Coastal Cleanup Day: Seal Beach Yacht Club | 10:00 a.m. — 12:00 p.m. | Long Beach | Los Angeles | Sign up |
| 9/19 | City of Long Beach | California Coastal Cleanup Day: Shoreline | 10:00 a.m. — 12:00 p.m. | Long Beach | Los Angeles | Sign up |
| 9/19 | Heal the Bay | California Coastal Cleanup Day: Inell Woods Park | 10:00 a.m. — 12:00 p.m. | Los Angeles | Los Angeles | Sign up |
| 9/19 | Gabrielino Tongva Springs Foundation | California Coastal Cleanup Day: Kuruvungna Springs | 10:00 a.m. — 12:00 p.m. | Los Angeles | Los Angeles | Sign up |
| 9/19 | Trout Unlimited | California Coastal Cleanup Day: LA River - Lewis MacAdams Riverfront Park | 10:00 a.m. — 12:00 p.m. | Los Angeles | Los Angeles | Sign up |
| 9/19 | California Wildlife Center | California Coastal Cleanup Day: Leo Carrillo State Beach | 10:00 a.m. — 12:00 p.m. | Malibu | Los Angeles | Sign up |
| 9/19 | CA State Parks | California Coastal Cleanup Day: Malibu Lagoon State Beach | 10:00 a.m. — 12:00 p.m. | Malibu | Los Angeles | Sign up |
| 9/19 | Fallon Loves Nature. Malibu Creek Ecosystem Restoration Project | California Coastal Cleanup Day: Malibu Surfrider Beach | 10:00 a.m. — 12:00 p.m. | Malibu | Los Angeles | Sign up |
| 9/19 | Nature Trust of the Santa Monica Mountains | California Coastal Cleanup Day: Nicholas Canyon Beach | 10:00 a.m. — 12:00 p.m. | Malibu | Los Angeles | Sign up |
| 9/19 | Kids Helping LA | California Coastal Cleanup Day: Topanga Beach | 10:00 a.m. — 12:00 p.m. | Malibu | Los Angeles | Sign up |
| 9/19 | Malibu West Swim Club | California Coastal Cleanup Day: Zuma Beach - Tower 16 | 10:00 a.m. — 12:00 p.m. | Malibu | Los Angeles | Sign up |
| 9/19 | Kinecta Federal Credit Union | California Coastal Cleanup Day: Manhattan Beach - Bruce's Beach | 10:00 a.m. — 12:00 p.m. | Manhattan Beach | Los Angeles | Sign up |
| 9/19 | International Business Machines Corp. | California Coastal Cleanup Day: Manhattan Beach - El Porto | 10:00 a.m. — 12:00 p.m. | Manhattan Beach | Los Angeles | Sign up |
| 9/19 | Roundhouse Aquarium | California Coastal Cleanup Day: Manhattan Beach - Pier | 10:00 a.m. — 12:00 p.m. | Manhattan Beach | Los Angeles | Sign up |
| 9/19 | Heal The Bay Volunteer Program | California Coastal Cleanup Day: Marina "Mother's" Beach | 10:00 a.m. — 12:00 p.m. | Marina Del Rey | Los Angeles | Sign up |
| 9/19 | Gruen Associates | California Coastal Cleanup Day: Will Rogers State Beach - Tower 15 | 10:00 a.m. — 12:00 p.m. | Pacific Palisades | Los Angeles | Sign up |
| 9/19 | Heal The Bay Volunteer Program | California Coastal Cleanup Day: Malaga Cove Beach - RAT Beach | 10:00 a.m. — 12:00 p.m. | Palos Verdes Estates | Los Angeles | Sign up |
| 9/19 | Heal The Bay Volunteer Program,AKA | California Coastal Cleanup Day: Arroyo Seco | 10:00 a.m. — 12:00 p.m. | Pasadena | Los Angeles | Sign up |
| 9/19 | Friends of Ballona Wetlands | California Coastal Cleanup Day: Ballona Wetlands Ecological Reserve | 10:00 a.m. — 12:00 p.m. | Playa Del Rey | Los Angeles | Sign up |
| 9/19 | Heal The Bay Volunteer Program | California Coastal Cleanup Day: Dockweiler State Beach - Tower 54 | 10:00 a.m. — 12:00 p.m. | Playa Del Rey | Los Angeles | Sign up |
| 9/19 | LA County Dept of Beaches & Harbors: Heal The Bay | California Coastal Cleanup Day: Dockweiler Youth Center | 10:00 a.m. — 12:00 p.m. | Playa Del Rey | Los Angeles | Sign up |
| 9/19 | Heal The Bay Volunteer Program | California Coastal Cleanup Day: Playa Del Rey Beach - Toes Beach | 10:00 a.m. — 12:00 p.m. | Playa Del Rey | Los Angeles | Sign up |
| 9/19 | Heal The Bay Volunteer Program | California Coastal Cleanup Day: Founders Park | 10:00 a.m. — 12:00 p.m. | Rancho Palos Verdes | Los Angeles | Sign up |
| 9/19 | Terranea Resort | California Coastal Cleanup Day: Terranea Cove | 10:00 a.m. — 12:00 p.m. | Rancho Palos Verdes | Los Angeles | Sign up |
| 9/19 | Heal The Bay Volunteer Program | California Coastal Cleanup Day: Redondo Beach - Ave C | 10:00 a.m. — 12:00 p.m. | Redondo Beach | Los Angeles | Sign up |
| 9/19 | South Bay Association of Realtors | California Coastal Cleanup Day: Redondo Beach - Pier (Southside) | 10:00 a.m. — 12:00 p.m. | Redondo Beach | Los Angeles | Sign up |
| 9/19 | Rancho Vista Elementary School | California Coastal Cleanup Day: Redondo Beach - Topaz Street | 10:00 a.m. — 12:00 p.m. | Redondo Beach | Los Angeles | Sign up |
| 9/19 | Cabrillo Marine Aquarium | California Coastal Cleanup Day: Cabrillo Beach | 10:00 a.m. — 12:00 p.m. | San Pedro | Los Angeles | Sign up |
| 9/19 | AKA and Santa Monica College | California Coastal Cleanup Day: Santa Monica State Beach - Bay St/The Ink Well Monument | 10:00 a.m. — 12:00 p.m. | Santa Monica | Los Angeles | Sign up |
| 9/19 | Team Marine, Santa Monica High School. IKAR | California Coastal Cleanup Day: Santa Monica State Beach - Ocean Park Blvd | 10:00 a.m. — 12:00 p.m. | Santa Monica | Los Angeles | Sign up |
| 9/19 | Heal The Bay | California Coastal Cleanup Day: Santa Monica State Beach - Pier (Northside) | 10:00 a.m. — 12:00 p.m. | Santa Monica | Los Angeles | Sign up |
| 9/19 | La Canada Engineering Club | California Coastal Cleanup Day: Santa Monica State Beach - Tower 12 | 10:00 a.m. — 12:00 p.m. | Santa Monica | Los Angeles | Sign up |
| 9/19 | California Gay Adventures | California Coastal Cleanup Day: Will Rogers State Beach - Ginger Rogers Beach | 10:00 a.m. — 12:00 p.m. | Santa Monica | Los Angeles | Sign up |
| 9/19 | Heal The Bay. Our Lady of the Miraculous Medal Parish School. Hunter's Heart Foundation | California Coastal Cleanup Day: Whittier Narrows Recreation Area | 10:00 a.m. — 12:00 p.m. | South El Monte | Los Angeles | Sign up |
| 9/19 | AKA and City of Torrance | California Coastal Cleanup Day: Torrance Beach | 10:00 a.m. — 12:00 p.m. | Torrance | Los Angeles | Sign up |
| 9/19 | Corazon Tlalli | California Coastal Cleanup Day: Tujunga Wash Greenway | 10:00 a.m. — 12:00 p.m. | Valley Glen | Los Angeles | Sign up |
| 9/19 | Heal the Bay | California Coastal Cleanup Day: Venice Beach - Pier (Southside) | 10:00 a.m. — 12:00 p.m. | Venice | Los Angeles | Sign up |
| 9/19 | Heal The Bay Volunteer Program | California Coastal Cleanup Day: Venice Beach - Rose Avenue | 10:00 a.m. — 12:00 p.m. | Venice | Los Angeles | Sign up |
| 9/19 | Heal the Bay | California Coastal Cleanup Day: Venice Beach - Tower 19 | 10:00 a.m. — 12:00 p.m. | Venice | Los Angeles | Sign up |
| 9/19 | Volunteer Captains | California Coastal Cleanup Day: Belvedere Beach (San Rafael Ave. Seawall) | 10:00 a.m. — 12:00 p.m. | Belvedere Tiburon | Marin | Sign up |
| 9/19 | Richardson Bay Harbor Seal Protection Initative | California Coastal Cleanup Day: Blackie's Pasture | 10:00 a.m. — 12:00 p.m. | Belvedere Tiburon | Marin | Sign up |
| 9/19 | Richardson Bay Audubon | California Coastal Cleanup Day: Richardson Bay Audubon Center & Sanctuary - Aramburu Island | 10:00 a.m. — 12:00 p.m. | Belvedere Tiburon | Marin | Sign up |
| 9/19 | Marin County Stormwater Program | California Coastal Cleanup Day: Agate Beach | 10:00 a.m. — 12:00 p.m. | Bolinas | Marin | Sign up |
| 9/19 | Marin County Parks & Open Space | California Coastal Cleanup Day: Kent Island | 10:00 a.m. — 12:00 p.m. | Bolinas | Marin | Sign up |
| 9/19 | Refugia Marin | California Coastal Cleanup Day: Corte Madera Pond | 10:00 a.m. — 12:00 p.m. | Corte Madera | Marin | Sign up |
| 9/19 | Corte Madera Community Foundation and Corte Madera Lions Club | California Coastal Cleanup Day: Shorebird Marsh | 10:00 a.m. — 12:00 p.m. | Corte Madera | Marin | Sign up |
| 9/19 | Marin County Parks | California Coastal Cleanup Day: Hal Brown Park at Creekside | 10:00 a.m. — 12:00 p.m. | Greenbrae | Marin | Sign up |
| 9/19 | National Park Service - Point Reyes National Seashore | California Coastal Cleanup Day: Drakes Beach | 10:00 a.m. — 12:00 p.m. | Inverness | Marin | Sign up |
| 9/19 | Wilcox/Hajar Family | California Coastal Cleanup Day: Kehoe Beach | 10:00 a.m. — 12:00 p.m. | Inverness | Marin | Sign up |
| 9/19 | California State Parks | California Coastal Cleanup Day: Millerton Point - Alan Sieroty Beach | 10:00 a.m. — 12:00 p.m. | Inverness | Marin | Sign up |
| 9/19 | Mill Valley Art Club and Marin County Parks and Open Space | California Coastal Cleanup Day: Bothin Marsh North | 10:00 a.m. — 12:00 p.m. | Mill Valley | Marin | Sign up |
| 9/19 | Volunteer Captains | California Coastal Cleanup Day: Muir Beach | 10:00 a.m. — 12:00 p.m. | Muir Beach | Marin | Sign up |
| 9/19 | Volunteer Captains | California Coastal Cleanup Day: Samuel P. Taylor State Park | 10:00 a.m. — 12:00 p.m. | Nicasio | Marin | Sign up |
| 9/19 | Marin County Parks & Open Space | California Coastal Cleanup Day: Black Point Boat Launch | 10:00 a.m. — 12:00 p.m. | Novato | Marin | Sign up |
| 9/19 | Point Blue Conservation Science | California Coastal Cleanup Day: Hamilton Wetlands | 10:00 a.m. — 12:00 p.m. | Novato | Marin | Sign up |
| 9/19 | Rotary Club of Novato | California Coastal Cleanup Day: Novato Creek/Warner Creek and Scottsdale Pond | 10:00 a.m. — 12:00 p.m. | Novato | Marin | Sign up |
| 9/19 | Marin County Parks and Open Space | California Coastal Cleanup Day: Rush Creek Open Space | 10:00 a.m. — 12:00 p.m. | Novato | Marin | Sign up |
| 9/19 | Environmental Action Committee of West Marin | California Coastal Cleanup Day: Sites Throughout West Marin | 10:00 a.m. — 12:00 p.m. | Point Reyes Station | Marin | Sign up |
| 9/19 | Volunteer Captains | California Coastal Cleanup Day: Remillard Park | 10:00 a.m. — 12:00 p.m. | San Quentin | Marin | Sign up |
| 9/19 | Volunteer Captains | California Coastal Cleanup Day: Bayside Park | 10:00 a.m. — 12:00 p.m. | San Rafael | Marin | Sign up |
| 9/19 | Volunteer Captains | California Coastal Cleanup Day: Loch Lomond Marina | 10:00 a.m. — 12:00 p.m. | San Rafael | Marin | Sign up |
| 9/19 | Marin County Parks | California Coastal Cleanup Day: McInnis Park - Gallinas Creek | 10:00 a.m. — 12:00 p.m. | San Rafael | Marin | Sign up |
| 9/19 | City of San Rafael | California Coastal Cleanup Day: Pickleweed Park | 10:00 a.m. — 12:00 p.m. | San Rafael | Marin | Sign up |
| 9/19 | 101 Surf Sports | California Coastal Cleanup Day: San Rafael Canal - By Water | 10:00 a.m. — 12:00 p.m. | San Rafael | Marin | Sign up |
| 9/19 | Friends of China Camp | California Coastal Cleanup Day: China Camp State Park | 10:00 a.m. — 12:00 p.m. | Santa Venetia | Marin | Sign up |
| 9/19 | National Park Service | California Coastal Cleanup Day: Rodeo Beach and Lagoon | 10:00 a.m. — 12:00 p.m. | Sausalito | Marin | Sign up |
| 9/19 | Sea Trek | California Coastal Cleanup Day: Sausalito By Water | 10:00 a.m. — 12:00 p.m. | Sausalito | Marin | Sign up |
| 9/19 | Golden Gate National Parks Conservancy | California Coastal Cleanup Day: Stinson Beach | 10:00 a.m. — 12:00 p.m. | Stinson Beach | Marin | Sign up |
| 9/19 | City of Fort Bragg | California Coastal Cleanup Day: Glass Beach | 10:00 a.m. — 12:00 p.m. | Fort Bragg | Mendocino | Sign up |
| 9/19 | Mendocino Land Trust | California Coastal Cleanup Day: Hare Creek Beach | 10:00 a.m. — 12:00 p.m. | Fort Bragg | Mendocino | Sign up |
| 9/19 | Noyo Center for Marine Science | California Coastal Cleanup Day: Noyo Harbor Beach | 10:00 a.m. — 12:00 p.m. | Fort Bragg | Mendocino | Sign up |
| 9/19 | Mendocino Land Trust | California Coastal Cleanup Day: Seaside Beach | 10:00 a.m. — 12:00 p.m. | Fort Bragg | Mendocino | Sign up |
| 9/19 | Mendocino Coast Audubon | California Coastal Cleanup Day: Ten Mile Beach | 10:00 a.m. — 12:00 p.m. | Fort Bragg | Mendocino | Sign up |
| 9/19 | North Coast Brewing Company | California Coastal Cleanup Day: Virgin Creek Beach | 10:00 a.m. — 12:00 p.m. | Fort Bragg | Mendocino | Sign up |
| 9/19 | California State Parks | California Coastal Cleanup Day: Van Damme Beach | 10:00 a.m. — 12:00 p.m. | Little River | Mendocino | Sign up |
| 9/19 | MendoParks | California Coastal Cleanup Day: Big River | 10:00 a.m. — 12:00 p.m. | Mendocino | Mendocino | Sign up |
| 9/19 | Coastal Mendocino Association of Realtors | California Coastal Cleanup Day: Caspar Beach | 10:00 a.m. — 12:00 p.m. | Mendocino | Mendocino | Sign up |
| 9/19 | California State Parks | California Coastal Cleanup Day: Russian Gulch | 10:00 a.m. — 12:00 p.m. | Mendocino | Mendocino | Sign up |
| 9/19 | California State Parks | California Coastal Cleanup Day: Navarro Beach | 10:00 a.m. — 12:00 p.m. | Navarro | Mendocino | Sign up |
| 9/19 | California State Parks | California Coastal Cleanup Day: Westport-Union Landing State Beach | 10:00 a.m. — 12:00 p.m. | Westport | Mendocino | Sign up |
| 9/19 | Town of Mammoth Lakes | California Coastal Cleanup Day: Annual Lakes Basin Cleanup | 10:00 a.m. — 12:00 p.m. | Mammoth Lakes | Mono | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Andrew Molera State Park | 10:00 a.m. — 12:00 p.m. | Big Sur | Monterey | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Pfeiffer Big Sur State Park | 10:00 a.m. — 12:00 p.m. | Big Sur | Monterey | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Carmel River State Beach | 10:00 a.m. — 12:00 p.m. | Carmel | Monterey | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Carmel Sunset Beach | 10:00 a.m. — 12:00 p.m. | Carmel | Monterey | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Garrapata State Beach | 10:00 a.m. — 12:00 p.m. | Carmel-By-The-Sea | Monterey | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Monastery Beach | 10:00 a.m. — 12:00 p.m. | Carmel-By-The-Sea | Monterey | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Salinas River State Beach at Molera Rd. | 10:00 a.m. — 12:00 p.m. | Castroville | Monterey | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Fort Ord Dunes State Beach | 10:00 a.m. — 12:00 p.m. | Marina | Monterey | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Marina State Beach at Reservation Rd | 10:00 a.m. — 12:00 p.m. | Marina | Monterey | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Del Monte Beach at Wharf II | 10:00 a.m. — 12:00 p.m. | Monterey | Monterey | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: North Del Monte/Tide Avenue/Casa Verde Beach | 10:00 a.m. — 12:00 p.m. | Monterey | Monterey | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Moss Landing State Beach | 10:00 a.m. — 12:00 p.m. | Moss Landing | Monterey | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Zmudowski State Beach | 10:00 a.m. — 12:00 p.m. | Moss Landing | Monterey | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Asilomar State Beach | 10:00 a.m. — 12:00 p.m. | Pacific Grove | Monterey | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Lovers Point Beach & Park | 10:00 a.m. — 12:00 p.m. | Pacific Grove | Monterey | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Salinas River National Wildlife Reuge | 10:00 a.m. — 12:00 p.m. | Salinas | Monterey | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Upper Carr Lake | 10:00 a.m. — 12:00 p.m. | Salinas | Monterey | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Laguna Grande Regional Park & Roberts Lake | 10:00 a.m. — 12:00 p.m. | Seaside | Monterey | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Monterey State Beach | 10:00 a.m. — 12:00 p.m. | Seaside | Monterey | Sign up |
| 9/19 | South Yuba River Citizens League | California Coastal Cleanup Day: BYLT: Wildflower preserve | 10:00 a.m. — 12:00 p.m. | Grass Valley | Nevada | Sign up |
| 9/19 | South Yuba River Citizens League | California Coastal Cleanup Day: Wolf Creek: Idaho-Maryland Rd | 10:00 a.m. — 12:00 p.m. | Grass Valley | Nevada | Sign up |
| 9/19 | South Yuba River Citizens League | California Coastal Cleanup Day: Wolf Creek: Wolf Creek Trail/Glen Jones Park | 10:00 a.m. — 12:00 p.m. | Grass Valley | Nevada | Sign up |
| 9/19 | South Yuba River Citizens League | California Coastal Cleanup Day: Bear Yuba Land Trust: Sugarloaf Trail | 10:00 a.m. — 12:00 p.m. | Nevada City | Nevada | Sign up |
| 9/19 | South Yuba River Citizens League | California Coastal Cleanup Day: Deer Creek: Downtown | 10:00 a.m. — 12:00 p.m. | Nevada City | Nevada | Sign up |
| 9/19 | South Yuba River Citizens League | California Coastal Cleanup Day: Deer Creek: Pioneer Park | 10:00 a.m. — 12:00 p.m. | Nevada City | Nevada | Sign up |
| 9/19 | South Yuba River Citizens League | California Coastal Cleanup Day: San Juan Ridge: Shady Creek | 10:00 a.m. — 12:00 p.m. | Nevada City | Nevada | Sign up |
| 9/19 | South Yuba River Citizens League | California Coastal Cleanup Day: San Juan Ridge: Spring Creek | 10:00 a.m. — 12:00 p.m. | Nevada City | Nevada | Sign up |
| 9/19 | South Yuba River Citizens League | California Coastal Cleanup Day: South Yuba: Edwards Crossing | 10:00 a.m. — 12:00 p.m. | Nevada City | Nevada | Sign up |
| 9/19 | South Yuba River Citizens League | California Coastal Cleanup Day: South Yuba: Highway 49 Crossing | 10:00 a.m. — 12:00 p.m. | Nevada City | Nevada | Sign up |
| 9/19 | South Yuba River Citizens League | California Coastal Cleanup Day: South Yuba: Jones Bar | 10:00 a.m. — 12:00 p.m. | Nevada City | Nevada | Sign up |
| 9/19 | South Yuba River Citizens League | California Coastal Cleanup Day: South Yuba: Lang's Crossing/Emerald Pools | 10:00 a.m. — 12:00 p.m. | Nevada City | Nevada | Sign up |
| 9/19 | South Yuba River Citizens League | California Coastal Cleanup Day: South Yuba: Poorman creek Trailhead | 10:00 a.m. — 12:00 p.m. | Nevada City | Nevada | Sign up |
| 9/19 | South Yuba River Citizens League | California Coastal Cleanup Day: South Yuba: Purdon Crossing | 10:00 a.m. — 12:00 p.m. | Nevada City | Nevada | Sign up |
| 9/19 | South Yuba River Citizens League | California Coastal Cleanup Day: TNF: Golden Quartz | 10:00 a.m. — 12:00 p.m. | Nevada City | Nevada | Sign up |
| 9/19 | South Yuba River Citizens League | California Coastal Cleanup Day: TNF: Pioneer Trail/Harmony Ridge | 10:00 a.m. — 12:00 p.m. | Nevada City | Nevada | Sign up |
| 9/19 | South Yuba River Citizens League | California Coastal Cleanup Day: South Yuba: Bridgeport | 10:00 a.m. — 12:00 p.m. | Penn Valley | Nevada | Sign up |
| 9/19 | South Yuba River Citizens League | California Coastal Cleanup Day: Squirrel Creek: Western Gateway Park | 10:00 a.m. — 12:00 p.m. | Penn Valley | Nevada | Sign up |
| 9/19 | South Yuba River Citizens League | California Coastal Cleanup Day: South Yuba: Little Town of Washington Beach at the Bridge | 10:00 a.m. — 12:00 p.m. | Washington | Nevada | Sign up |
| 9/19 | City of Brea | California Coastal Cleanup Day: Brea Creek Channel | 10:00 a.m. — 12:00 p.m. | Brea | Orange | Sign up |
| 9/19 | City of Dana Point | California Coastal Cleanup Day: Capo Beach/Palisades | 10:00 a.m. — 12:00 p.m. | Dana Point | Orange | Sign up |
| 9/19 | California State Parks | California Coastal Cleanup Day: Doheny State Beach | 10:00 a.m. — 12:00 p.m. | Dana Point | Orange | Sign up |
| 9/19 | Stand Up To Trash | California Coastal Cleanup Day: Ocean Institute | 10:00 a.m. — 12:00 p.m. | Dana Point | Orange | Sign up |
| 9/19 | Planet Purpose Solutions | California Coastal Cleanup Day: Salt Creek Beach/Park | 10:00 a.m. — 12:00 p.m. | Dana Point | Orange | Sign up |
| 9/19 | City Of Huntington Beach | California Coastal Cleanup Day: Bartlett Park | 10:00 a.m. — 12:00 p.m. | Huntington Beach | Orange | Sign up |
| 9/19 | City of Huntington Beach | California Coastal Cleanup Day: Beach Blvd./PCH | 10:00 a.m. — 12:00 p.m. | Huntington Beach | Orange | Sign up |
| 9/19 | Amigos de Bolsa Chica | California Coastal Cleanup Day: Bolsa Chica Ecological Reserve South Parking Lot | 10:00 a.m. — 12:00 p.m. | Huntington Beach | Orange | Sign up |
| 9/19 | Bolsa Chica Land Trust | California Coastal Cleanup Day: Bolsa Chica Land Trust | 10:00 a.m. — 12:00 p.m. | Huntington Beach | Orange | Sign up |
| 9/19 | Bolsa Chica State Beach | California Coastal Cleanup Day: Bolsa Chica State Beach | 10:00 a.m. — 12:00 p.m. | Huntington Beach | Orange | Sign up |
| 9/19 | Cliff Hangers Association | California Coastal Cleanup Day: Huntington Beach Cliffs | 10:00 a.m. — 12:00 p.m. | Huntington Beach | Orange | Sign up |
| 9/19 | Orange County Coastkeeper | California Coastal Cleanup Day: Huntington State Beach Tower 7 | 10:00 a.m. — 12:00 p.m. | Huntington Beach | Orange | Sign up |
| 9/19 | Irvine Ranch Water District | California Coastal Cleanup Day: San Diego Creek at San Joaquin Marsh | 10:00 a.m. — 12:00 p.m. | Irvine | Orange | Sign up |
| 9/19 | City of La Habra | California Coastal Cleanup Day: Coyote Creek Bike Trail | 10:00 a.m. — 12:00 p.m. | La Habra | Orange | Sign up |
| 9/19 | Laguna Ocean Foundation | California Coastal Cleanup Day: Aliso Beach | 10:00 a.m. — 12:00 p.m. | Laguna Beach | Orange | Sign up |
| 9/19 | City of Laguna Hills | California Coastal Cleanup Day: Laguna Hills Community Center | 10:00 a.m. — 12:00 p.m. | Laguna Hills | Orange | Sign up |
| 9/19 | American Legion Yacht Club | California Coastal Cleanup Day: American Legion Yacht Club | 10:00 a.m. — 12:00 p.m. | Newport Beach | Orange | Sign up |
| 9/19 | Newport Whales | California Coastal Cleanup Day: Newport Whales | 10:00 a.m. — 12:00 p.m. | Newport Beach | Orange | Sign up |
| 9/19 | Crystal Cove State Park | California Coastal Cleanup Day: Pelican Point Parking Lot 3 | 10:00 a.m. — 12:00 p.m. | Newport Beach | Orange | Sign up |
| 9/19 | Crystal Cove State Park | California Coastal Cleanup Day: Reef Point | 10:00 a.m. — 12:00 p.m. | Newport Beach | Orange | Sign up |
| 9/19 | Surfrider Foundation: North Orange County | California Coastal Cleanup Day: The Wedge - Newport Beach | 10:00 a.m. — 12:00 p.m. | Newport Beach | Orange | Sign up |
| 9/19 | Coastal Corridor Alliance | California Coastal Cleanup Day: Tower 74 | 10:00 a.m. — 12:00 p.m. | Newport Beach | Orange | Sign up |
| 9/19 | OC Parks / Newport Bay Conservancy | California Coastal Cleanup Day: Upper Newport Bay | 10:00 a.m. — 12:00 p.m. | Newport Beach | Orange | Sign up |
| 9/19 | Santiago Creek Greenway Alliance | California Coastal Cleanup Day: Hart Park | 10:00 a.m. — 12:00 p.m. | Orange | Orange | Sign up |
| 9/19 | Santiago Creek Greenway Alliance | California Coastal Cleanup Day: Yorba Park | 10:00 a.m. — 12:00 p.m. | Orange | Orange | Sign up |
| 9/19 | City of San Clemente | California Coastal Cleanup Day: San Clemente Pier | 10:00 a.m. — 12:00 p.m. | San Clemente | Orange | Sign up |
| 9/19 | California State Parks | California Coastal Cleanup Day: San Clemente State Beach | 10:00 a.m. — 12:00 p.m. | San Clemente | Orange | Sign up |
| 9/19 | San Clemente Rotary | California Coastal Cleanup Day: T-Street Beach | 10:00 a.m. — 12:00 p.m. | San Clemente | Orange | Sign up |
| 9/19 | City of San Juan Capistrano | California Coastal Cleanup Day: Descanso Park | 10:00 a.m. — 12:00 p.m. | San Juan Capistrano | Orange | Sign up |
| 9/19 | City of Santa Ana | California Coastal Cleanup Day: Santa Ana Gardens Channel @ Jerome Park | 10:00 a.m. — 12:00 p.m. | Santa Ana | Orange | Sign up |
| 9/19 | Save Our Beach | California Coastal Cleanup Day: Seal Beach | 10:00 a.m. — 12:00 p.m. | Seal Beach | Orange | Sign up |
| 9/19 | Fire Safe Council East Orange County Canyons | California Coastal Cleanup Day: Santiago Canyons Watershed | 10:00 a.m. — 12:00 p.m. | Silverado | Orange | Sign up |
| 9/19 | South Yuba River Citizens League | California Coastal Cleanup Day: Wider Watershed: Bear River Fishing Access | 10:00 a.m. — 12:00 p.m. | Colfax | Placer | Sign up |
| 9/19 | Placer Land Trust | California Coastal Cleanup Day: Lake Clementine Preserve | 10:00 a.m. — 12:00 p.m. | Auburn | Placer | Sign up |
| 9/19 | Inland Empire Waterkeeper | California Coastal Cleanup Day: Doty Trust Park | 10:00 a.m. — 12:00 p.m. | Riverside | Riverside | Sign up |
| 9/19 | American River Parkway Foundation | California Coastal Cleanup Day: ARPF Ancil Hoffman | 10:00 a.m. — 12:00 p.m. | Carmichael | Sacramento | Sign up |
| 9/19 | American River Parkway Foundation | California Coastal Cleanup Day: ARPF William B Pond Park | 10:00 a.m. — 12:00 p.m. | Carmichael | Sacramento | Sign up |
| 9/19 | American River Parkway Foundation | California Coastal Cleanup Day: ARPF On Water Clean-Up | 10:00 a.m. — 12:00 p.m. | Fair Oaks | Sacramento | Sign up |
| 9/19 | American River Parkway Foundation | California Coastal Cleanup Day: ARPF Sailor Bar Park | 10:00 a.m. — 12:00 p.m. | Fair Oaks | Sacramento | Sign up |
| 9/19 | American River Parkway Foundation | California Coastal Cleanup Day: ARPF Sunrise Recreation Area | 10:00 a.m. — 12:00 p.m. | Rancho Cordova | Sacramento | Sign up |
| 9/19 | American River Parkway Foundation | California Coastal Cleanup Day: ARPF Cal Expo | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/19 | American River Parkway Foundation | California Coastal Cleanup Day: ARPF Discovery Park | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/19 | American River Parkway Foundation | California Coastal Cleanup Day: ARPF Gristmill | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/19 | American River Parkway Foundation | California Coastal Cleanup Day: ARPF Guy West Bridge | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/19 | American River Parkway Foundation | California Coastal Cleanup Day: ARPF Howe Ave River Access | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/19 | American River Parkway Foundation | California Coastal Cleanup Day: ARPF Larchmont | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/19 | American River Parkway Foundation | California Coastal Cleanup Day: ARPF Northgate | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/19 | American River Parkway Foundation | California Coastal Cleanup Day: ARPF Paradise Beach | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/19 | American River Parkway Foundation | California Coastal Cleanup Day: ARPF River Bend Park | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/19 | American River Parkway Foundation | California Coastal Cleanup Day: ARPF Sutter's Landing | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/19 | American River Parkway Foundation | California Coastal Cleanup Day: ARPF Township9 Park | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/19 | American River Parkway Foundation | California Coastal Cleanup Day: ARPF Watt Ave River Access | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/19 | Delta Conservancy and Rio Vista Windsports Association | California Coastal Cleanup Day: Sherman Island | 10:00 a.m. — 12:00 p.m. | Rio Vista | Sacramento | Sign up |
| 9/19 | River City Waterway Alliance | California Coastal Cleanup Day: RCWA Sacramento River Cleanup | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/19 | City of Redlands | California Coastal Cleanup Day: Redlands Santa Ana River Wash | 10:00 a.m. — 12:00 p.m. | Redlands | San Bernardino | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Bonita - Bonita Long Canyon | 10:00 a.m. — 12:00 p.m. | Bonita | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Bonita - Sweetwater Community Garden | 10:00 a.m. — 12:00 p.m. | Bonita | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Solana Beach - San Elijo Lagoon County Park | 10:00 a.m. — 12:00 p.m. | Cardiff | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Carlsbad - Carlsbad Village | 10:00 a.m. — 12:00 p.m. | Carlsbad | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Carlsbad - Frazee Beach | 10:00 a.m. — 12:00 p.m. | Carlsbad | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Carlsbad - Quarry Creek (El Salto Falls) | 10:00 a.m. — 12:00 p.m. | Carlsbad | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Chula Vista - Broadway Marsh | 10:00 a.m. — 12:00 p.m. | Chula Vista | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Chula Vista - Broadway Marsh | 10:00 a.m. — 12:00 p.m. | Chula Vista | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Chula Vista - Chula Vista Wildlife Reserve | 10:00 a.m. — 12:00 p.m. | Chula Vista | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Chula Vista - Salt Mine Street Sweep | 10:00 a.m. — 12:00 p.m. | Chula Vista | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Chula Vista- Marina View Park | 10:00 a.m. — 12:00 p.m. | Chula Vista | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Cornodado - Silver Strand State Beach | 10:00 a.m. — 12:00 p.m. | Coronado | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Del Mar - Dog Beach | 10:00 a.m. — 12:00 p.m. | Del Mar | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Del Mar - San Dieguito Lagoon | 10:00 a.m. — 12:00 p.m. | Del Mar | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Blossom Valley - Flinn Springs County Park | 10:00 a.m. — 12:00 p.m. | El Cajon | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Carlsbad - South Ponto State Beach | 10:00 a.m. — 12:00 p.m. | Encinitas | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Encinitas - Cottonwood Creek Park | 10:00 a.m. — 12:00 p.m. | Encinitas | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Escondido - Dixon Lake | 10:00 a.m. — 12:00 p.m. | Escondido | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Escondido - Lake Wohlford | 10:00 a.m. — 12:00 p.m. | Escondido | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Escondido- Harmony Grove Creek | 10:00 a.m. — 12:00 p.m. | Escondido | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Fallbrook - De Luz- Ross Lake | 10:00 a.m. — 12:00 p.m. | Fallbrook | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Fallbrook - Live Oak County Park | 10:00 a.m. — 12:00 p.m. | Fallbrook | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Imperial Beach - YMCA Camp Surf | 10:00 a.m. — 12:00 p.m. | Imperial Beach | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: La Jolla - Children's Pool | 10:00 a.m. — 12:00 p.m. | La Jolla | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: La Jolla - Ellen Browning Scripps Park | 10:00 a.m. — 12:00 p.m. | La Jolla | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: La Jolla - La Jolla Cove | 10:00 a.m. — 12:00 p.m. | La Jolla | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: La Jolla - Windansea Beach | 10:00 a.m. — 12:00 p.m. | La Jolla | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: La Mesa - La Alvarado Avenue Street Sweep | 10:00 a.m. — 12:00 p.m. | La Mesa | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: La Mesa - Lake Murray | 10:00 a.m. — 12:00 p.m. | La Mesa | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Mission Bay - Fiesta Island (South) | 10:00 a.m. — 12:00 p.m. | La Mesa | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Lakeside - Vine Street | 10:00 a.m. — 12:00 p.m. | Lakeside | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Oceanside - Buccaneer Beach Park | 10:00 a.m. — 12:00 p.m. | Oceanside | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Oceanside - Quarry Creek (College Blvd) | 10:00 a.m. — 12:00 p.m. | Oceanside | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Ramona - Main Street Sweep | 10:00 a.m. — 12:00 p.m. | Ramona | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Ramona - Walnut Street Street Sweep | 10:00 a.m. — 12:00 p.m. | Ramona | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Allied Gardens - Rancho Mission Canyon | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Azalea Park - Poplar Street Sweep | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Balboa Park - Redwood Circle Trail | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Barrio Logan - Port Park | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: City Heights - Cooper Canyon | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: City Heights - Northeast Swan Canyon | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: City Heights - University Avenue Street Sweep | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: College West - Montezuma Road Street Sweep | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Fiesta Island - San Diego Canoe and Kayak Team | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Golden Hill - G Street Sweep | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Golden Hill - South Juniper Canyon | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Hillcrest - Pride Square Street Sweep | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Julian - Volcan Mountain | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Linda Vista - Tecolote Canyon | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Mission Bay - Belmont Park | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Mission Bay - Bonita Cove | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Mission Bay - Fiesta Island (North) | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Mission Bay - Gleason Road Street Sweep | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Mission Beach - South Mission Beach | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Oak Park - Chollas Lake | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Ocean Beach - Dog Beach | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Pacific Beach - Tourmaline Surf Park | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Point Loma - Famosa Slough | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Point Loma - Shelter Island | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Point Loma - South Western Yahct Club | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Point Loma - Sunset Cliffs Natural Park | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Rancho Penasquitos - Park Village Road Street Sweep | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Serra Mesa - Library Canyon | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Southcrest - Southcrest Recreation Center Park | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Tijuana River Valley - Tijuana River Valley Community Garden | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Cardiff - Seaside State Beach | 10:00 a.m. — 12:00 p.m. | Solana Beach | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Solana Beach - Fletcher Cove | 10:00 a.m. — 12:00 p.m. | Solana Beach | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Solana Beach - Shopping Center Creek Sweep | 10:00 a.m. — 12:00 p.m. | Solana Beach | San Diego | Sign up |
| 9/19 | I Love a Clean San Diego | California Coastal Cleanup Day: Vista - Buena Vista Creek Trail | 10:00 a.m. — 12:00 p.m. | Vista | San Diego | Sign up |
| 9/19 | SF Environment Department, Treasure Island Development Authority, San Francisco Recreation and Parks Department | California Coastal Cleanup Day: Coastal Cleanup Day on Treasure Island! | 10:00 a.m. — 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/19 | National Park Service and Golden Gate National Parks Conservancy | California Coastal Cleanup Day: Crissy Field East Beach | 10:00 a.m. — 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/19 | SF Greenagers | California Coastal Cleanup Day: Herons Head Park Eco Center | 10:00 a.m. — 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/19 | San Francisco Recreation and Parks Department Yacht Harbor Team | California Coastal Cleanup Day: Marina Yacht Harbor | 10:00 a.m. — 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/19 | National Park Service and Golden Gate National Parks Conservancy | California Coastal Cleanup Day: Ocean Beach | 10:00 a.m. — 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/19 | San Francisco Port Authority & Golden Gate Bird Alliance | California Coastal Cleanup Day: Pier 94 | 10:00 a.m. — 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/19 | San Francisco Recreation & Parks Department PSA 9 | California Coastal Cleanup Day: Sunset Dunes Park | 10:00 a.m. — 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/19 | San Francisco Recreation & Parks Department | California Coastal Cleanup Day: India Basin Waterfront Park | 10:00 a.m. — 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/19 | Kayaks Unlimted & Port of San Francisco | California Coastal Cleanup Day: Islais Creek Park | 10:00 a.m. — 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/19 | U.S. Army Corps of Engineers | California Coastal Cleanup Day: McHenry Recreation Area | 10:00 a.m. — 12:00 p.m. | Escalon | San Joaquin | Sign up |
| 9/19 | City of Lodi | California Coastal Cleanup Day: Lodi Lake-Mokelumne River | 10:00 a.m. — 12:00 p.m. | Lodi | San Joaquin | Sign up |
| 9/19 | San Joaquin County Public Works | California Coastal Cleanup Day: American Legion Park | 10:00 a.m. — 12:00 p.m. | Stockton | San Joaquin | Sign up |
| 9/19 | City of Stockton | California Coastal Cleanup Day: Buckley Cove | 10:00 a.m. — 12:00 p.m. | Stockton | San Joaquin | Sign up |
| 9/19 | Sierra Club-University of the Pacific | California Coastal Cleanup Day: Calaveras River | 10:00 a.m. — 12:00 p.m. | Stockton | San Joaquin | Sign up |
| 9/19 | City of Tracy | California Coastal Cleanup Day: Adams Park | 10:00 a.m. — 12:00 p.m. | Tracy | San Joaquin | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Arroyo Grande Creek | 10:00 a.m. — 12:00 p.m. | Arroyo Grande | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Lopez Lake | 10:00 a.m. — 12:00 p.m. | Arroyo Grande | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Oak Park Blvd./West Branch St. | 10:00 a.m. — 12:00 p.m. | Arroyo Grande | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Oso Flaco | 10:00 a.m. — 12:00 p.m. | Arroyo Grande | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Avila Park | 10:00 a.m. — 12:00 p.m. | Avila Beach | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Bob Jones Trailhead | 10:00 a.m. — 12:00 p.m. | Avila Beach | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Fisherman's Beach and Olde Port Beach | 10:00 a.m. — 12:00 p.m. | Avila Beach | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Pirates Cove/Cave Landing | 10:00 a.m. — 12:00 p.m. | Avila Beach | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Fiscalini Ranch | 10:00 a.m. — 12:00 p.m. | Cambria | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Moonstone Beach/Santa Rosa Creek | 10:00 a.m. — 12:00 p.m. | Cambria | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Shamel Park | 10:00 a.m. — 12:00 p.m. | Cambria | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Cayucos Pier | 10:00 a.m. — 12:00 p.m. | Cayucos | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Estero Bluffs State Beach | 10:00 a.m. — 12:00 p.m. | Cayucos | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Morro Bay Dog Beach/Torro Creek | 10:00 a.m. — 12:00 p.m. | Cayucos | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Morro Strand State Beach Day Use Area | 10:00 a.m. — 12:00 p.m. | Cayucos | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Grover Beach @ Grand Ave | 10:00 a.m. — 12:00 p.m. | Grover Beach | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Cuesta Inlet | 10:00 a.m. — 12:00 p.m. | Los Osos | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Bayshore Bluffs | 10:00 a.m. — 12:00 p.m. | Morro Bay | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Morro Bay Embarcadero | 10:00 a.m. — 12:00 p.m. | Morro Bay | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Morro Rock | 10:00 a.m. — 12:00 p.m. | Morro Bay | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Morro Strand South at Hwy. 41 | 10:00 a.m. — 12:00 p.m. | Morro Bay | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Olde Towne Nipomo | 10:00 a.m. — 12:00 p.m. | Nipomo | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Centennial Creek | 10:00 a.m. — 12:00 p.m. | Paso Robles | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Larry Moore Park | 10:00 a.m. — 12:00 p.m. | Paso Robles | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Salinas River Walk | 10:00 a.m. — 12:00 p.m. | Paso Robles | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Pismo Pier | 10:00 a.m. — 12:00 p.m. | Pismo Beach | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Baywood Pier / Paradise Point | 10:00 a.m. — 12:00 p.m. | San Luis Obispo | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Cuesta Park (SLO) | 10:00 a.m. — 12:00 p.m. | San Luis Obispo | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Downtown SLO (Mission Plaza) | 10:00 a.m. — 12:00 p.m. | San Luis Obispo | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: FirstFruit Farm | 10:00 a.m. — 12:00 p.m. | San Luis Obispo | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Laguna Lake (SLO) | 10:00 a.m. — 12:00 p.m. | San Luis Obispo | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Meadow Park | 10:00 a.m. — 12:00 p.m. | San Luis Obispo | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Santa Rosa Park | 10:00 a.m. — 12:00 p.m. | San Luis Obispo | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Sinsheimer Park (SLO) | 10:00 a.m. — 12:00 p.m. | San Luis Obispo | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Tank farm and Higuera Creek Bed | 10:00 a.m. — 12:00 p.m. | San Luis Obispo | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Elephant Seal Viewing Point | 10:00 a.m. — 12:00 p.m. | San Simeon | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Hearst Memorial State Beach | 10:00 a.m. — 12:00 p.m. | San Simeon | San Luis Obispo | Sign up |
| 9/19 | Environmental Center of San Luis Obispo (ECOSLO) | California Coastal Cleanup Day: Templeton Community Services District | 10:00 a.m. — 12:00 p.m. | Templeton | San Luis Obispo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: Belmont City Hall | 10:00 a.m. — 12:00 p.m. | Belmont | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: Brisbane | 10:00 a.m. — 12:00 p.m. | Brisbane | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: Burlingame - Bayfront Cleanup | 10:00 a.m. — 12:00 p.m. | Burlingame | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: Mussel Rock | 10:00 a.m. — 12:00 p.m. | Daly City | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: Thornton Vista | 10:00 a.m. — 12:00 p.m. | Daly City | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: Cooley Landing | 10:00 a.m. — 12:00 p.m. | East Palo Alto | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: Dunes Beach | 10:00 a.m. — 12:00 p.m. | El Granada | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: Surfer's Beach | 10:00 a.m. — 12:00 p.m. | El Granada | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: Foster City Lagoon | 10:00 a.m. — 12:00 p.m. | Foster City | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: Don Horsley Park at Tunitas Creek Beach | 10:00 a.m. — 12:00 p.m. | Half Moon Bay | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: Pillar Point Harbor | 10:00 a.m. — 12:00 p.m. | Half Moon Bay | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: Poplar Beach | 10:00 a.m. — 12:00 p.m. | Half Moon Bay | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: Venice Beach | 10:00 a.m. — 12:00 p.m. | Half Moon Bay | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: San Francisquito Creek, Menlo Park | 10:00 a.m. — 12:00 p.m. | Menlo Park | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: Bayfront Park | 10:00 a.m. — 12:00 p.m. | Millbrae | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: Central Park | 10:00 a.m. — 12:00 p.m. | Millbrae | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: Montara State Beach | 10:00 a.m. — 12:00 p.m. | Montara | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: Linda Mar Beach | 10:00 a.m. — 12:00 p.m. | Pacifica | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: Rockaway Beach | 10:00 a.m. — 12:00 p.m. | Pacifica | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: San Pedro Creek | 10:00 a.m. — 12:00 p.m. | Pacifica | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: Esplanade | 10:00 a.m. — 12:00 p.m. | Pacifica | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: Sharp Park | 10:00 a.m. — 12:00 p.m. | Pacifica | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: Peninsula Youth Sailing Foundation | 10:00 a.m. — 12:00 p.m. | Redwood City | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: Redwood City | 10:00 a.m. — 12:00 p.m. | Redwood City | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: San Gregorio State Beach | 10:00 a.m. — 12:00 p.m. | San Gregorio | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: Baywinds Park | 10:00 a.m. — 12:00 p.m. | San Mateo | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: Seal Point Park | 10:00 a.m. — 12:00 p.m. | San Mateo | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: Colma Creek | 10:00 a.m. — 12:00 p.m. | South San Francisco | San Mateo | Sign up |
| 9/19 | San Mateo County Health - Environmental Health Services | California Coastal Cleanup Day: South San Francisco - Haskins Way | 10:00 a.m. — 12:00 p.m. | South San Francisco | San Mateo | Sign up |
| 9/19 | San Francisco Bay Wildlife Society | California Coastal Cleanup Day: Don Edwards National Wildlife Refuge, San Jose | 10:00 a.m. — 12:00 p.m. | Alviso | Santa Clara | Sign up |
| 9/19 | South Bay Yacht Club | California Coastal Cleanup Day: South Bay Yacht Club, San Jose | 10:00 a.m. — 12:00 p.m. | Alviso | Santa Clara | Sign up |
| 9/19 | Campbell City Council | California Coastal Cleanup Day: Campbell Park, Campbell | 10:00 a.m. — 12:00 p.m. | Campbell | Santa Clara | Sign up |
| 9/19 | Santa Clara County Parks | California Coastal Cleanup Day: Stevens Creek Reservoir, Cupertino | 10:00 a.m. — 12:00 p.m. | Cupertino | Santa Clara | Sign up |
| 9/19 | Santa Clara County Parks | California Coastal Cleanup Day: Coyote Lake, Gilroy | 10:00 a.m. — 12:00 p.m. | Gilroy | Santa Clara | Sign up |
| 9/19 | Creek Connections Action Group | California Coastal Cleanup Day: Heritage Oaks Park, San Jose | 10:00 a.m. — 12:00 p.m. | Los Altos | Santa Clara | Sign up |
| 9/19 | Santa Clara County Parks | California Coastal Cleanup Day: Uvas Reservoir, Morgan Hill | 10:00 a.m. — 12:00 p.m. | Morgan Hill | Santa Clara | Sign up |
| 9/19 | Creek Connections Action Group | California Coastal Cleanup Day: Matadero Creek, Palo Alto | 10:00 a.m. — 12:00 p.m. | Palo Alto | Santa Clara | Sign up |
| 9/19 | City of Palo Alto | California Coastal Cleanup Day: San Francisquito Creek, Palo Alto | 10:00 a.m. — 12:00 p.m. | Palo Alto | Santa Clara | Sign up |
| 9/19 | City of San Jose - Airport Department, Planning & Development | California Coastal Cleanup Day: Airport Parkway, San Jose | 10:00 a.m. — 12:00 p.m. | San Jose | Santa Clara | Sign up |
| 9/19 | San Jose Bay Yacht Club - Alviso | California Coastal Cleanup Day: Almaden Lake, San Jose | 10:00 a.m. — 12:00 p.m. | San Jose | Santa Clara | Sign up |
| 9/19 | Santa Clara County Parks | California Coastal Cleanup Day: Calero Reservoir, San Jose | 10:00 a.m. — 12:00 p.m. | San Jose | Santa Clara | Sign up |
| 9/19 | Many Paths One Destination | California Coastal Cleanup Day: Coyote Creek, San Jose | 10:00 a.m. — 12:00 p.m. | San Jose | Santa Clara | Sign up |
| 9/19 | Capitol Park Goss Dobern Neighborhood Association | California Coastal Cleanup Day: Lower Silver Creek, San Jose | 10:00 a.m. — 12:00 p.m. | San Jose | Santa Clara | Sign up |
| 9/19 | Keep Coyote Creek Beautiful | California Coastal Cleanup Day: Olinder Dog Park, San Jose | 10:00 a.m. — 12:00 p.m. | San Jose | Santa Clara | Sign up |
| 9/19 | Creek Connections Action Group and De Mattei Construction | California Coastal Cleanup Day: Penitencia Creek Park, San Jose | 10:00 a.m. — 12:00 p.m. | San Jose | Santa Clara | Sign up |
| 9/19 | Creek Connections Action Group | California Coastal Cleanup Day: River Oaks Park, San Jose | 10:00 a.m. — 12:00 p.m. | San Jose | Santa Clara | Sign up |
| 9/19 | By Creek Connections Action Group | California Coastal Cleanup Day: Roosevelt Park, San Jose | 10:00 a.m. — 12:00 p.m. | San Jose | Santa Clara | Sign up |
| 9/19 | Creek Connections Action Group | California Coastal Cleanup Day: Thompson Creek, San Jose | 10:00 a.m. — 12:00 p.m. | San Jose | Santa Clara | Sign up |
| 9/19 | Green Roots Community Foundation | California Coastal Cleanup Day: Everett N. "Eddie" Souza Park, Santa Clara | 10:00 a.m. — 12:00 p.m. | Santa Clara | Santa Clara | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Beer Can Beach | 10:00 a.m. — 12:00 p.m. | Aptos | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Hidden Beach | 10:00 a.m. — 12:00 p.m. | Aptos | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Rio Del Mar State Beach | 10:00 a.m. — 12:00 p.m. | Aptos | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Seacliff State Beach | 10:00 a.m. — 12:00 p.m. | Aptos | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: San Lorenzo River @ Ben Lomond Highlands Park | 10:00 a.m. — 12:00 p.m. | Ben Lomond | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: San Lorenzo River@ Boulder Creek Barbara Day Park | 10:00 a.m. — 12:00 p.m. | Boulder Creek | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Capitola City Beach | 10:00 a.m. — 12:00 p.m. | Capitola | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: New Brighton State Beach | 10:00 a.m. — 12:00 p.m. | Capitola | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Davenport Landing Beach | 10:00 a.m. — 12:00 p.m. | Davenport | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Davenport Main Beach | 10:00 a.m. — 12:00 p.m. | Davenport | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Greyhound Rock Beach | 10:00 a.m. — 12:00 p.m. | Davenport | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Scott Creek Beach | 10:00 a.m. — 12:00 p.m. | Davenport | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Waddell State Beach | 10:00 a.m. — 12:00 p.m. | Davenport | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Lompico Creek | 10:00 a.m. — 12:00 p.m. | Felton | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: San Lorenzo River @ Felton Covered Bridge Park | 10:00 a.m. — 12:00 p.m. | Felton | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Ano Nuevo State Beach | 10:00 a.m. — 12:00 p.m. | Pescadero | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: 3-Mile State Beach | 10:00 a.m. — 12:00 p.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: 4-Mile State Beach | 10:00 a.m. — 12:00 p.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Blacks Beach | 10:00 a.m. — 12:00 p.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Bonny Doon State Beach | 10:00 a.m. — 12:00 p.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Corcoran Lagoon Beach | 10:00 a.m. — 12:00 p.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Cowell/Main Beach | 10:00 a.m. — 12:00 p.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: It's Beach/Lighthouse Field State Beach | 10:00 a.m. — 12:00 p.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Laguna Creek Beach | 10:00 a.m. — 12:00 p.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Mitchell's Cove Beach | 10:00 a.m. — 12:00 p.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Moran Lake Beach | 10:00 a.m. — 12:00 p.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Natural Bridges State Beach | 10:00 a.m. — 12:00 p.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Panther State Beach | 10:00 a.m. — 12:00 p.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Pleasure Point Beaches | 10:00 a.m. — 12:00 p.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: San Lorenzo River @ Josephine St. (Hwy. 1 overpass to Soquel Ave) | 10:00 a.m. — 12:00 p.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: San Lorenzo River @ Soquel Ave. to Rivermouth | 10:00 a.m. — 12:00 p.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: San Lorenzo River @ The Tannery Arts Center | 10:00 a.m. — 12:00 p.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: SC Wharf SCUBA | 10:00 a.m. — 12:00 p.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Seabright State Beach | 10:00 a.m. — 12:00 p.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Shark Fin Cove State Beach | 10:00 a.m. — 12:00 p.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Sunny Cove Beach | 10:00 a.m. — 12:00 p.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Twin Lakes State Beach | 10:00 a.m. — 12:00 p.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Manresa State Beach | 10:00 a.m. — 12:00 p.m. | Watsonville | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Pajaro River @ Pajaro River Park | 10:00 a.m. — 12:00 p.m. | Watsonville | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Palm Beach State Park | 10:00 a.m. — 12:00 p.m. | Watsonville | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Sunset State Beach | 10:00 a.m. — 12:00 p.m. | Watsonville | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Watsonville Ohlone Loop Trail @ Struve Slough | 10:00 a.m. — 12:00 p.m. | Watsonville | Santa Cruz | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: West Struve Slough @ Pajaro Valley High School | 10:00 a.m. — 12:00 p.m. | Watsonville | Santa Cruz | Sign up |
| 9/19 | Solano County Parks | California Coastal Cleanup Day: McGary road and creek | 10:00 a.m. — 12:00 p.m. | American Canyon | Solano | Sign up |
| 9/19 | City of Benicia | California Coastal Cleanup Day: Alvarez 9th Street Park (Foot of West 9th Street) | 10:00 a.m. — 12:00 p.m. | Benicia | Solano | Sign up |
| 9/19 | City of Benicia | California Coastal Cleanup Day: Yacht Club | 10:00 a.m. — 12:00 p.m. | Benicia | Solano | Sign up |
| 9/19 | City of Dixon | California Coastal Cleanup Day: Pond B2 (Doyle Pond) | 10:00 a.m. — 12:00 p.m. | Dixon | Solano | Sign up |
| 9/19 | Solano Resource Conservation District | California Coastal Cleanup Day: Ulatis Creek/Delta | 10:00 a.m. — 12:00 p.m. | Dixon | Solano | Sign up |
| 9/19 | Fairfield-Suisun Sewer District | California Coastal Cleanup Day: American Canyon Creek | 10:00 a.m. — 12:00 p.m. | Fairfield | Solano | Sign up |
| 9/19 | Fairfield-Suisun Sewer District | California Coastal Cleanup Day: Green Valley Creek | 10:00 a.m. — 12:00 p.m. | Fairfield | Solano | Sign up |
| 9/19 | Fairfield-Suisun Sewer District | California Coastal Cleanup Day: Lower Dan Wilson Creek | 10:00 a.m. — 12:00 p.m. | Fairfield | Solano | Sign up |
| 9/19 | Fairfield-Suisun Sewer District | California Coastal Cleanup Day: Lower Laurel Creek | 10:00 a.m. — 12:00 p.m. | Fairfield | Solano | Sign up |
| 9/19 | Fairfield-Suisun Sewer District | California Coastal Cleanup Day: Lower Ledgewood Creek | 10:00 a.m. — 12:00 p.m. | Fairfield | Solano | Sign up |
| 9/19 | Fairfield-Suisun Sewer District | California Coastal Cleanup Day: Lower Union Creek | 10:00 a.m. — 12:00 p.m. | Fairfield | Solano | Sign up |
| 9/19 | Fairfield-Suisun Sewer District | California Coastal Cleanup Day: Mid-Section Laurel Creek | 10:00 a.m. — 12:00 p.m. | Fairfield | Solano | Sign up |
| 9/19 | Fairfield-Suisun Sewer District | California Coastal Cleanup Day: Upper Dan Wilson Creek - Solano Community College | 10:00 a.m. — 12:00 p.m. | Fairfield | Solano | Sign up |
| 9/19 | Fairfield-Suisun Sewer District | California Coastal Cleanup Day: Upper Laurel Creek | 10:00 a.m. — 12:00 p.m. | Fairfield | Solano | Sign up |
| 9/19 | Fairfield-Suisun Sewer District | California Coastal Cleanup Day: Upper Ledgewood Creek | 10:00 a.m. — 12:00 p.m. | Fairfield | Solano | Sign up |
| 9/19 | Fairfield-Suisun Sewer District | California Coastal Cleanup Day: Suisun Boat Ramp (Main St.) | 10:00 a.m. — 12:00 p.m. | Suisun City | Solano | Sign up |
| 9/19 | Solano County Parks | California Coastal Cleanup Day: Sandy Beach/Rio Vista | 10:00 a.m. — 12:00 p.m. | Rio Vista | Solano | Sign up |
| 9/19 | Fairfield-Suisun Sewer District | California Coastal Cleanup Day: Grizzly Island Trail | 10:00 a.m. — 12:00 p.m. | Suisun City | Solano | Sign up |
| 9/19 | Fairfield-Suisun Sewer District | California Coastal Cleanup Day: Hill Slough | 10:00 a.m. — 12:00 p.m. | Suisun City | Solano | Sign up |
| 9/19 | Fairfield-Suisun Sewer District | California Coastal Cleanup Day: Marina Channel at Suisun Slough | 10:00 a.m. — 12:00 p.m. | Suisun City | Solano | Sign up |
| 9/19 | Fairfield-Suisun Sewer District | California Coastal Cleanup Day: McCoy Creek Bike Path | 10:00 a.m. — 12:00 p.m. | Suisun City | Solano | Sign up |
| 9/19 | Fairfield-Suisun Sewer District | California Coastal Cleanup Day: Suisun City Waterfront | 10:00 a.m. — 12:00 p.m. | Suisun City | Solano | Sign up |
| 9/19 | Solano Resource Conservation District | California Coastal Cleanup Day: Andrews Park | 10:00 a.m. — 12:00 p.m. | Vacaville | Solano | Sign up |
| 9/19 | Solano Resource Conservation District | California Coastal Cleanup Day: Winco | 10:00 a.m. — 12:00 p.m. | Vacaville | Solano | Sign up |
| 9/19 | VALCORE/Vallejo Flood and Wastewater District | California Coastal Cleanup Day: Blue Rock Springs Park | 10:00 a.m. — 12:00 p.m. | Vallejo | Solano | Sign up |
| 9/19 | VALCORE/Vallejo Flood and Wastewater District | California Coastal Cleanup Day: Cullinan Ranch | 10:00 a.m. — 12:00 p.m. | Vallejo | Solano | Sign up |
| 9/19 | VALCORE/Vallejo Flood and Wastewater District | California Coastal Cleanup Day: Dan Foley Park | 10:00 a.m. — 12:00 p.m. | Vallejo | Solano | Sign up |
| 9/19 | VALCORE/Vallejo Flood and Wastewater District | California Coastal Cleanup Day: Delta Meadows Park | 10:00 a.m. — 12:00 p.m. | Vallejo | Solano | Sign up |
| 9/19 | VALCORE/Vallejo Flood and Wastewater District | California Coastal Cleanup Day: Glen Cove Marina | 10:00 a.m. — 12:00 p.m. | Vallejo | Solano | Sign up |
| 9/19 | VALCORE/Vallejo Flood and Wastewater District | California Coastal Cleanup Day: Glen Cove Waterfront Park | 10:00 a.m. — 12:00 p.m. | Vallejo | Solano | Sign up |
| 9/19 | VALCORE/Vallejo Flood and Wastewater District | California Coastal Cleanup Day: Hanns Park (upper) | 10:00 a.m. — 12:00 p.m. | Vallejo | Solano | Sign up |
| 9/19 | VALCORE/Vallejo Flood and Wastewater District | California Coastal Cleanup Day: Lake Dalwigk | 10:00 a.m. — 12:00 p.m. | Vallejo | Solano | Sign up |
| 9/19 | VALCORE/Vallejo Flood and Wastewater District | California Coastal Cleanup Day: Meadows | 10:00 a.m. — 12:00 p.m. | Vallejo | Solano | Sign up |
| 9/19 | VALCORE/Vallejo Flood and Wastewater District | California Coastal Cleanup Day: Rindler Creek | 10:00 a.m. — 12:00 p.m. | Vallejo | Solano | Sign up |
| 9/19 | VALCORE/Vallejo Flood and Wastewater District | California Coastal Cleanup Day: River Park | 10:00 a.m. — 12:00 p.m. | Vallejo | Solano | Sign up |
| 9/19 | VALCORE/Vallejo Flood and Wastewater District | California Coastal Cleanup Day: Sacramento Street @ Hwy. 37 | 10:00 a.m. — 12:00 p.m. | Vallejo | Solano | Sign up |
| 9/19 | VALCORE/Vallejo Flood and Wastewater District | California Coastal Cleanup Day: Vallejo Municipal Marina | 10:00 a.m. — 12:00 p.m. | Vallejo | Solano | Sign up |
| 9/19 | VALCORE/Vallejo Flood and Wastewater District | California Coastal Cleanup Day: White Slough | 10:00 a.m. — 12:00 p.m. | Vallejo | Solano | Sign up |
| 9/19 | Solano County Parks | California Coastal Cleanup Day: Lake Solano County Park | 10:00 a.m. — 12:00 p.m. | Winters | Solano | Sign up |
| 9/19 | Putah Creek Council | California Coastal Cleanup Day: Winters Putah Creek Nature Park | 10:00 a.m. — 12:00 p.m. | Winters | Solano | Sign up |
| 9/19 | City of Santa Rosa | California Coastal Cleanup Day: Santa Rosa Creek to Coast Cleanup | 10:00 a.m. — 12:00 p.m. | Santa Rosa | Sonoma | Sign up |
| 9/19 | City of Camarillo | California Coastal Cleanup Day: Camarillo— Calleguas Creek | 10:00 a.m. — 12:00 p.m. | Camarillo | Ventura | Sign up |
| 9/19 | City of Camarillo | California Coastal Cleanup Day: Camarillo— Mission Oaks Barranca (F Canyon) | 10:00 a.m. — 12:00 p.m. | Camarillo | Ventura | Sign up |
| 9/19 | City of Fillmore | California Coastal Cleanup Day: Fillmore— Shiell's Park | 10:00 a.m. — 12:00 p.m. | Fillmore | Ventura | Sign up |
| 9/19 | Not provided on map | California Coastal Cleanup Day: Moorpark— Villa Campesina Park | 10:00 a.m. — 12:00 p.m. | Moorpark | Ventura | Sign up |
| 9/19 | Wishtoyo Foundation (Ventura Coastalkeeper Program) | California Coastal Cleanup Day: Oxnard— Mugu Rock Beach | 10:00 a.m. — 12:00 p.m. | Oxnard | Ventura | Sign up |
| 9/19 | City of Thousand Oaks | California Coastal Cleanup Day: Thousand Oaks— Arroyo Conejo Creek | 10:00 a.m. — 12:00 p.m. | Newbury Park | Ventura | Sign up |
| 9/19 | CSU Channel Islands Boating Center | California Coastal Cleanup Day: Oxnard— Channel Islands Boating Center | 10:00 a.m. — 12:00 p.m. | Oxnard | Ventura | Sign up |
| 9/19 | City of Oxnard | California Coastal Cleanup Day: Oxnard— olo?koy Beach Park | 10:00 a.m. — 12:00 p.m. | Oxnard | Ventura | Sign up |
| 9/19 | Coastal Keepers | California Coastal Cleanup Day: Oxnard— Ormond Lagoon | 10:00 a.m. — 12:00 p.m. | Oxnard | Ventura | Sign up |
| 9/19 | Ventura County Watershed Protection District | California Coastal Cleanup Day: Oxnard— Silver Strand Beach | 10:00 a.m. — 12:00 p.m. | Oxnard | Ventura | Sign up |
| 9/19 | Piru Neighborhood Council & Friends of the Santa Clara River | California Coastal Cleanup Day: Piru— Warring Park | 10:00 a.m. — 12:00 p.m. | Piru | Ventura | Sign up |
| 9/19 | Surfrider Foundation | California Coastal Cleanup Day: Port Hueneme — Ormond Beach Lot C | 10:00 a.m. — 12:00 p.m. | Port Hueneme | Ventura | Sign up |
| 9/19 | The Port of Huneme | California Coastal Cleanup Day: Port Hueneme— Hueneme Beach (West End at Hueneme Wharf Plaza | 10:00 a.m. — 12:00 p.m. | Port Hueneme | Ventura | Sign up |
| 9/19 | City of Port Hueneme | California Coastal Cleanup Day: Port Huneme— Hueneme Beach (Alaska Flight 216 Memorial) | 10:00 a.m. — 12:00 p.m. | Port Hueneme | Ventura | Sign up |
| 9/19 | County of Ventura | California Coastal Cleanup Day: Santa Paula— Steckel Park | 10:00 a.m. — 12:00 p.m. | Santa Paula | Ventura | Sign up |
| 9/19 | City of Simi Valley | California Coastal Cleanup Day: Simi Valley— Duck Pond Park | 10:00 a.m. — 12:00 p.m. | Simi Valley | Ventura | Sign up |
| 9/19 | Ventura Suburban Kiwanis | California Coastal Cleanup Day: Ventura— Marina Park Beach | 10:00 a.m. — 12:00 p.m. | Ventura | Ventura | Sign up |
| 9/19 | Volunteer Captain | California Coastal Cleanup Day: Ventura— Rincon Parkway | 10:00 a.m. — 12:00 p.m. | Ventura | Ventura | Sign up |
| 9/19 | State Parks | California Coastal Cleanup Day: Ventura— San Buenventura State Beach | 10:00 a.m. — 12:00 p.m. | Ventura | Ventura | Sign up |
| 9/19 | The Nature Conservancy | California Coastal Cleanup Day: Ventura— Santa Clara River Gateway | 10:00 a.m. — 12:00 p.m. | Ventura | Ventura | Sign up |
| 9/19 | Channel Islands National Park | California Coastal Cleanup Day: Ventura— Ventura Harbor Beaches | 10:00 a.m. — 12:00 p.m. | Ventura | Ventura | Sign up |
| 9/19 | Cache Creek Conservancy | California Coastal Cleanup Day: Esparto | 10:00 a.m. — 12:00 p.m. | Esparto | Yolo | Sign up |
| 9/19 | Lake Washington Sailing Club | California Coastal Cleanup Day: Lake Washington | 10:00 a.m. — 12:00 p.m. | West Sacramento | Yolo | Sign up |
| 9/19 | River City Rowing Club | California Coastal Cleanup Day: River City Rowing Club | 10:00 a.m. — 12:00 p.m. | West Sacramento | Yolo | Sign up |
| 9/19 | City of Woodland | California Coastal Cleanup Day: East Regional Pond | 10:00 a.m. — 12:00 p.m. | Woodland | Yolo | Sign up |
| 9/19 | South Yuba River Citizens's League | California Coastal Cleanup Day: Lower Yuba: Hammon Grove | 10:00 a.m. — 12:00 p.m. | Browns Valley | Yuba | Sign up |
| 9/19 | South Yuba River Citizens's League | California Coastal Cleanup Day: Lower Yuba: Parks Bar | 10:00 a.m. — 12:00 p.m. | Browns Valley | Yuba | Sign up |
| 9/19 | South Yuba River Citizens's League | California Coastal Cleanup Day: Marysville: Yuba/Feather Confluence | 10:00 a.m. — 12:00 p.m. | Marysville | Yuba | Sign up |
| 9/19 | South Yuba River Citizens's League | California Coastal Cleanup Day: Tahoe National Forest: Oregon Creek Day-Use Area | 10:00 a.m. — 12:00 p.m. | North San Juan | Yuba | Sign up |
| 9/19 | South Yuba River Citizens's League | California Coastal Cleanup Day: Lower Yuba: EnglebrightLake | 10:00 a.m. — 12:00 p.m. | Smartsville | Yuba and Nevada | Sign up |
| 9/19 | RefuseRefuse | Refuse Refuse Community Greening Event | 10:00 a.m. — 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/19 | Food ED | Food ED Green Care Day - Monrovia Community Garden | 10:00 a.m. — 12:00 p.m. | Monrovia | Los Angeles | Sign up |
| 9/19 | Inland Empire Waterkeeper | Inland Empire Waterkeeper Community Greening Event | 10:00 a.m. — 12:00 p.m. | Riverside | Riverside | Sign up |
| 9/19 | Tolowa Dee-ni' Nation | California Coastal Cleanup Day: Dat-naa-svt | 10:00 a.m. — 12:00 p.m. | Smith River | Del Norte | Sign up |
| 9/19 | California State Parks, Redwoods Parks Conservancy, Smith River Alliance | California Coastal Cleanup Day: Del Norte County | 10:00 a.m. — 12:00 p.m. | Crescent City | Del Norte | Sign up |
| 9/19 | Save Our Shores | California Coastal Cleanup Day: Sand City Beach at Playa Ave | 10:00 a.m. — 12:00 p.m. | Seaside | Monterey | Sign up |
| 9/20 | Amigos de los Rios | Greening Washington Elementary - Site Care | 10:00 a.m. — 12:00 p.m. | Pasadena | Los Angeles | Sign up |
| 9/20 | Pacific Beach Coalition | Calera Creek Restoration | 10:00 a.m. — 12:00 p.m. | Pacifica | San Mateo | Sign up |
| 9/20 | Active San Gabriel Valley | Bike Rodeo and Bike Skills Course in El Monte | 10:00 a.m. — 12:00 p.m. | El Monte | Los Angeles | Sign up |
| 9/20 | Nevada California Oregon Railway | Nevada California Oregon Railway Community Greening Event | 10:00 a.m. — 12:00 p.m. | Alturas | Modoc | Sign up |
| 9/20 | California Climate Action Now! | California Climate Action Now! Community Greening Event | 10:00 a.m. — 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/20 | Friends of Sausal Creek | Bridgeview Trailhead and Pollinator Garden | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/20 | Friends of the Lost Coast | California Coastal Cleanup Month: Shelter Cove | 10:00 a.m. — 12:00 p.m. | Whitethorn | Humboldt | Sign up |
| 9/20 | National Park Service and Golden Gate National Parks Conservancy | California Coastal Cleanup Day: Fort Mason | 10:00 a.m. — 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/22 | Napa Resource Conservation District | Napa Creek- corner of Main and Pearl St. | 10:00 a.m. — 12:00 p.m. | Napa | Napa | Sign up |
| 9/23 | Solana Center for Environmental Innovation | Backyard Composting Basics Webinar | 10:00 a.m. — 12:00 p.m. | Online | Online | Sign up |
| 9/23 | Mount Shasta Bioregional Ecology Center | Wildfire Preparedness | 10:00 a.m. — 12:00 p.m. | Mt. Shasta | Siskiyou | Sign up |
| 9/23 | City of Berkeley | California Coastal Cleanup Day | 10:00 a.m. — 12:00 p.m. | Berkeley | Alameda | Sign up |
| 9/23 | Napa Resource Conservation District | Kennedy Park: boat dock | 10:00 a.m. — 12:00 p.m. | Napa | Napa | Sign up |
| 9/24 | Active San Gabriel Valley | Alhambra Rain Gardens Walking Tour | 10:00 a.m. — 12:00 p.m. | Alhambra | Los Angeles | Sign up |
| 9/24 | SLO Climate Coalition | SLO Climate Coalition Vehicle Electrification Event | 10:00 a.m. — 12:00 p.m. | San Luis Obispo | San Luis Obispo | Sign up |
| 9/24 | Napa Resource Conservation District | Napa County Library | 10:00 a.m. — 12:00 p.m. | Napa | Napa | Sign up |
| 9/25 | Rio Hondo College - College Corps | Rio Hondo College Community Greening Event | 10:00 a.m. — 12:00 p.m. | Whittier | Los Angeles | Sign up |
| 9/25 | Napa Resource Conservation District | Oxbow District, meet at CIA Copia | 10:00 a.m. — 12:00 p.m. | Napa | Napa | Sign up |
| 9/26 | California Volunteers, Keep California Beautiful, Los Angeles Rec & Parks, Shine LA, UCLA Volunter Center | South LA Wetlands Park Native Planting & Mulching | 10:00 a.m. — 12:00 p.m. | Los Angeles | Los Angeles | Sign up |
| 9/26 | Amigos de los Rios | Greening the San Gabriel River - Site Care | 10:00 a.m. — 12:00 p.m. | El Monte | Los Angeles | Sign up |
| 9/26 | One Arroyo Foundation | Wildfire Resiliency with One Arroyo Foundation | 10:00 a.m. — 12:00 p.m. | South Pasadena | Los Angeles | Sign up |
| 9/26 | Solana Center for Environmental Innovation | Gardening Practices that Save Water Workshop | 10:00 a.m. — 12:00 p.m. | Pine Valley | San Diego | Sign up |
| 9/26 | GrowGood, Inc | Grow for Good: Veterans Garden Volunteer Day | 10:00 a.m. — 12:00 p.m. | Los Angeles | Los Angeles | Sign up |
| 9/26 | Keep California Beautiful, Shine LA, Community Climate Action Day, Riordan PTA | Campus Garden Beautification & Native Planting Day | 10:00 a.m. — 12:00 p.m. | Los Angeles | Los Angeles | Sign up |
| 9/26 | SLO Climate Coalition | SLO Climate Coalition Vehicle Electrification Event | 10:00 a.m. — 12:00 p.m. | Arroyo Grande | San Luis Obispo | Sign up |
| 9/26 | Shine LA and Community Climate Action Day (CCAD) – Los Angeles County, RCD of the Santa Monica Mountains, Xerces Society | Monarch Habitat Restoration Day at Topanga State Park | 10:00 a.m. — 12:00 p.m. | Topanga | Los Angeles | Sign up |
| 9/26 | Santa Clara County Parks | Alviso Habitat Restoration Day | 10:00 a.m. — 12:00 p.m. | Alviso | Santa Clara | Sign up |
| 9/26 | Santa Clara County Parks | Hellyer Weeding Party | 10:00 a.m. — 12:00 p.m. | San Jose | Santa Clara | Sign up |
| 9/26 | One Arroyo Foundation | Habitat Restoration with One Arroyo | 10:00 a.m. — 12:00 p.m. | Pasadena | Los Angeles | Sign up |
| 9/26 | Reuse Alliance | Reuse Bazaar | 10:00 a.m. — 12:00 p.m. | Santa Rosa | Sonoma | Sign up |
| 9/26 | Breathe Southern California and Rio Hondo College | California Elementary School Garden Build | 10:00 a.m. — 12:00 p.m. | La Puente | Los Angeles | Sign up |
| 9/26 | Groundwork San Diego Chollas Creek | Community Greening Event with Groundwork San Diego | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/26 | Friends of the Los Angeles River | Habitat Restoration Day with Friends of the Los Angeles River | 10:00 a.m. — 12:00 p.m. | Van Nuys | Los Angeles | Sign up |
| 9/26 | Rollingwood Neighborhood Alliance | Rolling Neighborhood Alliance Litter Clean up | 10:00 a.m. — 12:00 p.m. | San Pablo | Contra Costa | Sign up |
| 9/26 | Ventura County Resource Conservation District | Ventura County Resource Conservation District Wildfire Resilience Event | 10:00 a.m. — 12:00 p.m. | Ojai | Ventura | Sign up |
| 9/26 | Friends of Auburn Ravine | Friends of Auburn Ravine Creek Clean Up | 10:00 a.m. — 12:00 p.m. | Lincoln | Placer | Sign up |
| 9/26 | San Diego Bird Alliance | San Diego Bird Alliance Community Greening Event | 10:00 a.m. — 12:00 p.m. | Chula Vista | San DIego | Sign up |
| 9/26 | KIDSHA - Kids Helping LA | KIDSHA - Kids Helping LA Community Greening Event | 10:00 a.m. — 12:00 p.m. | Los Angeles | Los Angeles | Sign up |
| 9/26 | One Arroyo Foundation | One Arroyo Foundation Community Greening Event | 10:00 a.m. — 12:00 p.m. | South Pasadena | Los Angeles | Sign up |
| 9/26 | The Bay Foundation | Manhattan Beach Dune Restoration with The Bay Foundation | 10:00 a.m. — 12:00 p.m. | Manhattan Beach | Los Angeles | Sign up |
| 9/26 | Contra Costa Resource Conservation District/FoMCW/MCWC | Upper Sand Creek Basin | 10:00 a.m. — 12:00 p.m. | Antioch | Contra Costa | Sign up |
| 9/26 | Volunteer Trail Stewards | Bay Trail | 10:00 a.m. — 12:00 p.m. | Arcata | Humboldt | Sign up |
| 9/26 | Volunteer Trail Stewards | Humboldt Bay Trail | 10:00 a.m. — 12:00 p.m. | Arcata | Humboldt | Sign up |
| 9/26 | Wildlands Conservancy | Centerville Beach | 10:00 a.m. — 12:00 p.m. | Ferndale | Humboldt | Sign up |
| 9/26 | Napa RCD | Salvador Creek, Vinatge High School, off Trower Rd. | 10:00 a.m. — 12:00 p.m. | Napa | Napa | Sign up |
| 9/26 | Breathe Southern California | Let's build some planters for a school community garden | 10:00 a.m. — 12:00 p.m. | La Puente | Los Angeles | Sign up |
| 9/26 | LA Compost | Urban Greening with LA Compost | 10:00 a.m. — 12:00 p.m. | Los Angeles | Los Angeles | Sign up |
| 9/26 | Food ED Community Climate Action Day - Temple City High School | Food ED Community Climate Action Day - Temple City High School | 10:00 a.m. — 12:00 p.m. | Temple City | Los Angeles | Sign up |
| 9/26 | Friends of Runyon Canyon | Runyon Canyon Park Invasive Species Removal | 10:00 a.m. — 12:00 p.m. | Los Angeles | Los Angeles | Sign up |
| 9/26 | City of Glendora | Dawson Avenue Park Restoration Day | 10:00 a.m. — 12:00 p.m. | Glendora | Los Angeles | Sign up |
| 9/26 | South Bay Center for Counseling | Heart of the Harbor Community Farm Garden Day | 10:00 a.m. — 12:00 p.m. | Los Angeles | Los Angeles | Sign up |
| 9/26 | City of Glendora | South Hills Park Restoration Day | 10:00 a.m. — 12:00 p.m. | Glendora | Los Angeles | Sign up |
| 9/27 | Amigos de los Rios | Greening Santa Fe Middle School - Site Care | 10:00 a.m. — 12:00 p.m. | Monrovia | Los Angeles | Sign up |
| 9/27 | Pacific Beach Coalition | Linda Mar Habitat Restoration | 10:00 a.m. — 12:00 p.m. | Pacifica | San Mateo | Sign up |
| 9/27 | Active San Gabriel Valley | Intermediate Community Bike Ride: Visit the Santa Fe Dam Nature Center! | 10:00 a.m. — 12:00 p.m. | El Monte | Los Angeles | Sign up |
| 9/27 | Napa RCD | South Wetlands (End of Jefferson Street) | 10:00 a.m. — 12:00 p.m. | Napa | Napa | Sign up |
| 9/28 | City of St Helena | Jacob Meily Park | 10:00 a.m. — 12:00 p.m. | St. Helena | Napa | Sign up |
| 9/29 | Mount Shasta Bioregional Ecology Center | Saving Nature with Your Yard | 10:00 a.m. — 12:00 p.m. | Mt. Shasta | Siskiyou | Sign up |
| 9/29 | Calistoga Rotary | Tedeschi Field | 10:00 a.m. — 12:00 p.m. | Calistoga | Napa | Sign up |
| 9/30 | Sustainable Claremont | Sustainable Claremont Community Greening Event | 10:00 a.m. — 12:00 p.m. | Claremont | Los Angeles | Sign up |
| 8/26, 9/26, 10/31, 11/28, 12/26 | SAYLOVE | SAYLOVE Saturday | 10:00 a.m. — 12:00 p.m. | Yuba City, Marysville, Olivehurst | Sutter and Yuba | Sign up |
| 9/19 | Lake Merritt Conservancy | Creek to Bay Day with the Conservancy | 10:00 a.m. — 12:00 p.m. | Oakland | Alameda | Sign up |
| 9/19 | Groundwork San Diego - Chollas Creek | Stewardship Saturday - Rooted in Community | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/19 | River District | Great American River Clean-Up- Township 9 Park | 10:00 a.m. — 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/19 | I Love A Clean San Diego | Coastal Cleanup Day | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| 9/20 | Creative Art Events | Trashion Show Long Beach | 10:00 a.m. — 12:00 p.m. | Long Beach | Los Angeles | Sign up |
| 9/25 | Lakeside's River Park Conservancy | Willow Staking Project | 10:00 a.m. — 12:00 p.m. | Lakeside | San Diego | Sign up |
| 9/26 | California Institute of Environmental Design & Management (CIEDM) | California Institute of Environmental Design & Management (CIEDM) Climate Actions @ Arcadia Ecohome Microforest | 10:00 a.m. — 12:00 p.m. | Arcadia | Los Angeles | Sign up |
| 9/6, 9/20, 10/4,10/18 | Fresno Metro Ministry | Yo'ville Farmer's Market | 10:00 a.m. — 12:00 p.m. | Fresno | Fresno | Sign up |
| Various | HandsOn San Diego | FOOD: Organize/Set Up a Community Market | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| Various | HandsOn San Diego | SORT: Clothing Processor at Sharia's Closet | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| Various | HandsOn San Diego | FOOD: Food Pantry Operations Volunteer | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| Various | HandsOn San Diego | FOOD: Community Market Food Rescue Driver | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| Various | HandsOn San Diego | FOOD: Food Pantry Operations Volunteer | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
| Various | HandsOn San Diego | FOOD: Dreams for Change Food Bank | 10:00 a.m. — 12:00 p.m. | San Diego | San Diego | Sign up |
