Join us at one of the many climate action events throughout the state to help protect our planet and build sustainable communities.
Featured Events
Climate Action Counts – Ongoing
Climate Action Counts is an effort to unite Californians to take everyday climate actions at home and in your neighborhood. Take the pledge during Climate Action Month (September) and be entered for a chance to win one of five $100 incentives towards a local farmers market or a CSA (community supported agriculture) farm box program thanks to the California Volunteers Fund! Sign up here.
LA Community Climate Action Day – September 27
California Volunteers and our partners host Community Climate Action Days to bring us together to work on projects protecting communities from climate change while improving quality of life and access to green spaces. Sign up here.
California Clean Air Day – October 1
California Clean Air Day is built on the idea that shared experiences unite people to action to improve our community health. By joining together for a unified day of action we can create new habits to clear the air for all members of California’s diverse communities. Sign up here.
September Events
Use the search box: Find volunteer opportunities by entering your city or county name or search by date.
| Date | Organization | Event | Start/End Times | City | County | Register |
|---|---|---|---|---|---|---|
| 9/2 | I Love A Clean San Diego | Love SD Litter Cleanup - Belmont Park | 3:00 p.m. - 5:00 p.m. | San Diego | San Diego | Sign up |
| 9/3 | Butte County Local Food Network | Community Composting with Butte County Local Food Network | 7:30 a.m. - 12:00 p.m. | Chico | Butte | Sign up |
| 9/3 | LA Compost | Food Scraps Collection | 3:00 p.m. - 5:45 p.m. | Los Angeles | Los Angeles | Sign up |
| 9/4 | Mount Shasta Bioregional Ecology Center | Citizen Science Workshop | 6:00 p.m. - 7:00 p.m. | Mount Shasta | Siskiyou | Sign up |
| 9/4 | Town of Mammoth Lake | Trashy Thursdays | 5:00 p.m. - 6:00 p.m. | Mammoth Lakes | Mono | Sign up |
| 9/5 | HandsOn San Diego | ECO: Weed Warriors | 8:00 a.m. - 10:00 a.m. | San Diego | San Diego | Sign up |
| 9/5 | OC Habitats | OCH Restoration at the Upper Newport Bay (Salt Marsh) | 8:30 a.m. - 10:30 a.m. | Newport Beach | Orange | Sign up |
| 9/5 | Siskiyou Land Trust | Wherrit Property - Sweet Pea Removal | 9:30 a.m. - 11:30 a.m. | Mount Shasta | Siskiyou | Sign up |
| 9/5 | Solano Resource Conservation District | First Friday at Ledgewood | 10:00 a.m. - 12:00 p.m. | Fairfield | Solano | Sign up |
| 9/6 | Alta Peak Chapter, California Native Plant Society; The Blue Oak Nursery | California Biodiversity Day 2025 - Springville Bioblitz | 9:00 a.m. - 11:30 a.m. | Springville | Tulare | Sign up |
| 9/6 | Amigos de Bolsa Chica | Bolsa Chica Bioblitz | 9:00 a.m. - 10:30 a.m. | Huntington Beach | Orange | Sign up |
| 9/6 | Big Sur Land Trust | California Biodiversity Day bioblitz at Marks Ranch | 9:00 a.m. - 12:00 p.m. | Salinas | Monterey | Sign up |
| 9/6 | Breathe Southern California | Fresh, Fit & Fun Fair with Fontana | 9:00 a.m. - 11:00 a.m. | Fontana | San Bernadino | Sign up |
| 9/6 | California Central Coast Chapter of the Wildlife Society; UCSC Fort Ord Natural Reserve | Guided Hike: UCSC Ord Natural Reserve | 8:00 a.m. - 11:00 a.m. | Marina | Monterey | Sign up |
| 9/6 | California Department of Fish and Wildlife | Biodiversity Bash! | 1:00 p.m. - 4:00 p.m. | Newport Beach | Orange | Sign up |
| 9/6 | California Department of Fish and Wildlife | Tour of San Joaquin Fish Hatchery and FINS Biodiversity Blitz! | 9:00 a.m. - 10:00 a.m. | Friant | Fresno | Sign up |
| 9/6 | California State Parks | Biodiversity Day at Caswell Memorial State Park | 8:30 a.m. - 10:00 a.m. | Ripon | San Joaquin | Sign up |
| 9/6 | California State Parks | CA Biodiversity Week Bioblitz at South Cardiff State Beach | 8:30 a.m. - 12:00 p.m. | Solana Beach | San Diego | Sign up |
| 9/6 | California State Parks | Junior Rangers - Campground Critter Count | 9:00 a.m. - 10:00 a.m. | Carlsbad | San Diego | Sign up |
| 9/6 | California State Parks | Beach, Birds & BioBlitz at Carmel River State Beach | 9:00 a.m. - 12:00 p.m. | Carmel | Montery | Sign up |
| 9/6 | California State Parks | Asilomar Community Bioblitz | 10:00 a.m. - 4:00 p.m. | Pacific Grove | Monterey | Sign up |
| 9/6 | Feather River Land Trust | Full Moon Hike | 5:30 p.m. - 7:30 p.m. | Beckworth | Plumas | Sign up |
| 9/6 | Fresno Discovery Center | Fresno Discovery Center Volunteer Day | 8:30 a.m. - 11:30 p.m. | Fresno | Fresno | Sign up |
| 9/6 | HandsOn San Diego | ECO: Day in the EarthLab Garden | 8:30 a.m. - 11:30 a.m. | San Diego | San Diego | Sign up |
| 9/6 | Kern County Economic Development Division | Lake Isabella Boulevard Clean-up | 7:00 a.m. - 10:00 a.m. | Lake Isabella | Kern | Sign up |
| 9/6 | Mount Shasta Bioregional Ecology Center and Siskiyou Land Trust | Friends Family Nature Walk: CA Biodiversity Day Sensing the Seasons Summer Edition & Bioblitz | 10:00 a.m. - 2:00 p.m. | Medicine Lake | Modoc | Sign up |
| 9/6 | Peninsula Open Space Trust | Bair Island Volunteer Day | 9:00 a.m. - 12:00 p.m. | Redwood City | San Mateo | Sign up |
| 9/6 | Pepperwood Foundation | 30x30 Species Challenge at Pepperwood | 1:30 p.m. - 4:30 p.m. | Santa Rosa | Sonoma | Sign up |
| 9/6 | Radio Wilderness | Bird Adventure at Fenton Pond | 8:00 a.m. - 10:00 a.m. | San Diego | San Diego | Sign up |
| 9/6 | Sacramento Audubon | Biodiversity Day at Bushy Lake | 6:30 a.m. - 10:30 a.m. | Sacramento | Sacramento | Sign up |
| 9/6 | Sacramento Valley Conservancy | Biodiversity Day and BioBlitz | 9:00 a.m. - 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/6 | San Diego Canyonlands | Stewardship Saturday in Swan Canyon | 8:00 a.m. - 10:30 a.m. | San Diego | San Diego | Sign up |
| 9/6 | San Francisco Environment | D2 Beautification Day | 8:30 a.m. - 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/6 | Santa Cruz Museum of Natural History | Native Wildflower Seed Bombing | 10:00 a.m. - 11:30 a.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/6 | Sonoma Ecology Center | Senderos: La biodiversidad en Sugarloaf | 10:00 a.m. - 1:00 p.m. | Kenwood | Sonoma | Sign up |
| 9/6 | Stewards of the Coast and Redwoods | Find 30 Species Coastal Walk | 10:00 a.m. - 12:00 p.m. | Jenner | Sonoma | Sign up |
| 9/6 | Transition Habitat Conservancy | Celebrate Biodiversity | 6:00 p.m. - 11:59 p.m. | Lancaster | Los Angeles | Sign up |
| 9/6 | UC San Diego Natural Reserve System | Docent-led walks at Scripps Coastal Reserve | 9:00 a.m. - 11:00 a.m. | La Jolla | San Diego | Sign up |
| 9/6 | Wildlife Jewels | Plant For Hummingbirds Day | 11:00 a.m. - 1:00 p.m. | Newport Beach | Orange | Sign up |
| 9/6 | Pacific Beach Coalition | Rockaway Beach Cleanup | 09:00 a.m. - 11:00 a.m. | Pacifica | San Mateo | Sign up |
| 9/7 | Amigos de los Rios | Greening the San Gabriel River - Planting & Site Care | 8:00 a.m. - 11:00 a.m. | El Monte | Los Angeles | Sign up |
| 9/7 | Amigos de los Rios | Greening Plymouth Elementary - Site Care | 8:00 a.m. - 11:00 a.m. | Monrovia | Los Angeles | Sign up |
| 9/7 | California Department of Fish and Wildlife & City of San Diego Parks and Recreation Department | La Jolla Tidepools Bioblitz | 10:00 a.m. - 2:00 p.m. | La Jolla | San Diego | Sign up |
| 9/7 | California State Capitol Museum | Capitol Park Bird Talk and Walk | 9:30 a.m. - 10:30 a.m. | Sacramento | Sacramento | Sign up |
| 9/7 | California State Parks | California Biodiversity Park Tour | 11:00 a.m. - 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/7 | California State Parks | Big Sur Bioblitz Nature Walk | 2:00 p.m. - 3:30 p.m. | Big Sur | Monterey | Sign up |
| 9/7 | California State Parks | Trestles Treasures: A Bioblitz Hike! | 9:00 a.m. - 10:30 a.m. | San Clemente | Orange | Sign up |
| 9/7 | California State Parks | South Grove Guided Hike at Calaveras Big Trees State Park | 10:00 a.m. - 1:00 p.m. | Arnold | Calaveras | Sign up |
| 9/7 | Conservation Works | Rainwater Harvesting Tank Demonstration | 10:00 a.m. - 1:00 p.m. | Boonville | Mendocino | Sign up |
| 9/7 | East Bay Regional Park District - Del Valle | CA Biodiversity Day 2025- Del Valle Regional Park | 9:30 a.m. - 12:00 p.m. | Livermore | Alameda | Sign up |
| 9/7 | Empire Mine SHP Guided Backcountry Hike | Empire Mine SHP Guided Backcountry Hike | 9:00 a.m. - 11:00 a.m. | Grass Valley | Nevada | Sign up |
| 9/7 | Golden Gate Bird Alliance | Bird Curious BioBlitz @ North Lake, Golden Gate Park | 9:00 a.m. - 11:00 a.m. | San Francisco | San Francisco | Sign up |
| 9/7 | HandsOn San Diego | HELP OUT: Restore Historic HiPass Camp in Boulevard | 2:00 p.m. - 7:00 p.m. | Boulevard | San Diego | Sign up |
| 9/7 | Livermore Area Recreation and Park District | Biodiversity Day @ Sycamore Grove | 10:00 a.m. - 12:00 p.m. | Livermore | Alameda | Sign up |
| 9/7 | Oakland Pride | Volunteer at Oakland Pride Parade & Festival | Various | Oakland | Alameda | Sign up |
| 9/7 | Olompali State Historic Park | Olompali Nature Walk and ID Klatch | 8:30 a.m. - 12:00 p.m. | Novato | Marin | Sign up |
| 9/7 | Radio Wilderness | Moth Night at Paradise Marsh | 7:30 p.m. - 10:00 p.m. | National City | San Diego | Sign up |
| 9/7 | Redwood Parks Conservancy | Habitat Restoration - Tolowa Dunes State Park | 10:00 a.m. - 2:00 p.m. | Crescent City | Del Norte | Sign up |
| 9/7 | San Diego River Park Foundation | Peutz Creek (near Alpine) Birding Expedition | 8:30 a.m. - 10:30 a.m. | Alpine | San Diego | Sign up |
| 9/7 | San Fernando Valley Audubon Society | Sepulveda Basin Bird Walk | 8:00 a.m. - 11:00 a.m. | Van Nuys | Los Angeles | Sign up |
| 9/7 | San Francisco Bay Wildlife Society | California Biodiversity Day BioBlitz at the Refuge | 10:30 a.m. - 12:00 p.m. | San Jose | Santa Clara | Sign up |
| 9/7 | Sonoma Ecology Center | BirdBlitz! (CA Biodiversity Week 2025) | 9:00 a.m. - 11:30 a.m. | Kenwood | Sonoma | Sign up |
| 9/7 | Stewards of the Arroyo Seco, Council of Arroyo Seco Organizations | Arroyo Seco Biodiversity Day | 3:00 p.m. - 6:00 p.m. | Various | Los Angeles | Sign up |
| 9/7 | Trinity River Resource Conservation District | 2025 Trinity River Clean Up | 9:00 a.m. - 1:00 p.m. | Helena | Trinity | Sign up |
| 9/8 | San Diego River Park Foundation | Birding BioBlitz at Grant Park (Mission Valley) | 8:00 a.m. - 10:30 a.m. | San Diego | San Diego | Sign up |
| 9/9 | California State Parks | BioBlitz at the Marina Peninsula Trail | 10:00 a.m. - 11:00 a.m. | Morro Bay | San Luis Obispo | Sign up |
| 9/10 | Butte County Local Food Network | Community Composting with Butte County Local Food Network | 7:30 a.m. - 12:00 p.m. | Chico | Butte | Sign up |
| 9/10 | California State Parks | CA Biodiversity Day 2025 McArthur-Burney Falls Memorial State Park | 10:00 a.m. - 3:00 p.m. | Burney | Shasta | Sign up |
| 9/10 | California State Parks | California Biodiversity Park Tour | 11:00 a.m. - 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/10 | California State Parks | BioBlitz at Hatton Canyon Ishxenta State Park | 9:00 a.m. - 12:00 p.m. | Hatton Canyon | Monterey | Sign up |
| 9/10 | North Coast California Native Plant Society | CNPS Nursery Visit & Volunteer Workday | 11:00 a.m. - 1:00 p.m. | Eureka | Humboldt | Sign up |
| 9/10 | Radio Wilderness | Moth and friends at the SWC Otay Mesa campus | 8:00 p.m. - 10:00 p.m. | San Diego | San Diego | Sign up |
| 9/10 | UC Davis Center for Community and Citizen Science | Exploring Our Campus Schoolyard Bioblitz | 8:00 a.m. - 2:00 p.m. | Dixon | Solano | Sign up |
| 9/11 | AmeriCorps & Feeding America | 9/11 Day Meal Pack | Various | Los Angeles | Los Angeles | Sign up |
| 9/11 | LA Works | 9/11 Day of Service | 9:00 a.m. - 1:00 p.m. | Los Angeles | Los Angeles | Sign up |
| 9/11 | Santa Cruz Bird Club | San Lorenzo River Levee Walk | 9:00 a.m. - 10:00 a.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/11 | Town of Mammoth Lake | Trashy Thursdays | 5:00 p.m. - 6:00 p.m. | Mammoth Lakes | Mono | Sign up |
| 9/12 | California State Parks | Bioblitz on the Moonstone Beach Boardwalk | 10:30 a.m. - 11:30 a.m. | Cambria | San Luis Obispo | Sign up |
| 9/12 | California State Parks | Tour Terrific Tide Pools In Mackerricher State Park | 8:30 a.m. - 10:30 a.m. | Fort Bragg | Mendocino | Sign up |
| 9/12 | California State Parks | Beach Bioblitz Pop-up | 9:30 a.m. - 11:30 a.m. | Grover Beach | San Luis Obispo | Sign up |
| 9/12 | City of Long Beach | Restoration Fridays | 2:00 p.m. - 3:30 p.m. | Long Beach | Los Angeles | Sign up |
| 9/12 | Folsom Lake State Recreation Area | Water Hyacinth Removal Paddle and Bioblitz | 9:00 a.m. - 11:30 a.m. | Folsom | Sacramento | Sign up |
| 9/12 | Natural Bridges State Beach | Join the Bioblitz to document and explore the incredibly diverse invertebrates of the Natural Bridges Tidepools | 9:30 a.m. - 11:30 a.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/12 | San Diego Canyonlands | Sips & Sagebrush at Mission Hills Canyon | 9:00 a.m. - 11:00 a.m. | San Diego | San Diego | Sign up |
| 9/12 | Santa Cruz District, State Parks | Wilder Ranch State Park Biodiversity Week 2025 Bioblitz | 9:00 a.m. - 11:00 a.m. | Santa Cruz | Santa Cruz | Sign up |
| 9/12 | Torrey Pines State Natural Reserve | Torrey Treasures - Blitz the Reserve! | 8:00 a.m. - 7:00 p.m. | La Jolla | San Diego | Sign up |
| 9/12 | US Forest Service Pacific Southwest Research Station | Tahoe Environmental Observatory Network: Hands-on Biodiversity and Environmental Quality Data | 10:00 a.m. - 12:30 p.m. | South Lake Tahoe | El Dorado | Sign up |
| 9/13 | Amigos de los Rios | Greening the San Gabriel River - Planting & Site Care | 8:00 a.m. - 11:00 a.m. | El Monte | Los Angeles | Sign up |
| 9/13 | Amigos de los Rios | Greening Monrovia High School - Site Care | 8:00 a.m. - 11:00 a.m. | Monrovia | Los Angeles | Sign up |
| 9/13 | Anza-Borrego Desert State Park Visitor Center | Nocturnal Life at Anza-Borrego Desert State Park! | 8:00 p.m. - 9:00 p.m. | Borrego Springs | San Diego | Sign up |
| 9/13 | Arroyos & Foothills Conservancy | Sycamore Canyon BioBlitz | 8:00 a.m. - 9:30 a.m. | Glendale | Los Angeles | Sign up |
| 9/13 | Bird Walk at the Nimbus Fish Hatchery | Bird Walk at the Nimbus Fish Hatchery | 8:00 a.m. - 11:00 a.m. | Gold River | Sacramento | Sign up |
| 9/13 | Butte County Fire Safe Council | Butte Creek Canyon Grazing Workshop | 9:00 a.m. - 1:00 p.m. | Chico | Butte | Sign up |
| 9/13 | California Academy of Sciences | Lake Merced Watershed California Bioblitz | 10:30 a.m. - 1:30 p.m. | San Francisco | San Francisco | Sign up |
| 9/13 | California Department of Fish and Wildlife | Elkhorn Slough Reserve Biodiversity Celebration | 9:30 a.m. - 4:30 p.m. | Royal Oaks | San Benito | Sign up |
| 9/13 | California Department of Fish and Wildlife and the Wiyot Tribe | Ocean Ranch Restoration Day | 10:00 a.m. - 1:00 p.m. | Loleta | Humboldt | Sign up |
| 9/13 | California State Parks | Family Fun -Bioblitz Nature Walk | 11:00 a.m. - 12:00 p.m. | Big Sur | Monterey | Sign up |
| 9/13 | California State Parks | Biodiversity Day at Caswell Memorial State Park | 8:30 a.m. - 10:00 a.m. | Ripon | San Joaquin | Sign up |
| 9/13 | California State Parks | Hidden Habitat Hike - Guided Bioblitz Walk at Tomato Fields (Ecke Parcel) | 8:30 a.m. - 10:30 a.m. | Carlsbad | San Diego | Sign up |
| 9/13 | California State Parks | 30 Species Challenge Hike | 9:00 a.m. - 1:00 p.m. | Mill Valley | Marin | Sign up |
| 9/13 | California State Parks | Nature Bio-Blitz, Story Time book, Jr. Ranger program, Seed Giveaway, Scavenger Hunt, and Butterfly Release | 9:00 a.m. - 11:00 a.m. | Oroville | Butte | Sign up |
| 9/13 | California State Parks | Celebrating Biodiversity at Dos Rios | 9:00 a.m. - 2:00 p.m. | Modesto | Stanislaus | Sign up |
| 9/13 | California State Parks | Biodiversity by Firelight | 7:00 p.m. - 7:45 p.m. | Mill Valley | Marin | Sign up |
| 9/13 | California State Parks | Delta Meadows Bird Walk | 9:00 a.m. - 10:30 a.m. | Walnut Grove | Sacramento | Sign up |
| 9/13 | California State Parks | Rooted in Relationship: Biocultural Diversity at Ishxenta State Park | 9:30a.m. - 12:30 p.m. | Carmel | Monterey | Sign up |
| 9/13 | City of Chula Vista | Free Compost Event | 8:00 a.m. - 12:00 p.m. | Chula Vista | San Diego | Sign up |
| 9/13 | City of Eureka | Sequoia Park Ivy Removal | 9:00 a.m. - 1:00 p.m. | Eureka | Humboldt | Sign up |
| 9/13 | Earth Discovery Institute | Twilight BioBlitz Hike | 5:30 p.m. - 7:00 p.m. | El Cajon | San Diego | Sign up |
| 9/13 | Fairview Park Alliance | Explore Fairview Park's Biodiversity | 9:00 a.m. - 11:00 a.m. | Costa Mesa | Orange | Sign up |
| 9/13 | Folsom Powerhouse State Historic Park | Folsom Powerhouse 130th Anniversary Bioblitz | 10:00 a.m. - 3:00 p.m. | Folsom | Sacramento | Sign up |
| 9/13 | Food Exploration & Discovery | Green Care Day | 8:30 a.m. - 11:30 a.m. | Monrovia | Los Angeles | Sign up |
| 9/13 | Friends of Rose Creek | Rose Creek Native Plant Garden Work Party | 9:00 a.m. - 11:00 a.m. | San Diego | San Diego | Sign up |
| 9/13 | Friends of the Dunes | BioBlitz & DERT Restoration Day at the Dunes | 10:00 a.m. - 1:00 p.m. | Arcata | Humboldt | Sign up |
| 9/13 | Grassroots Ecology | CA Biodiversity Day: Volunteer at Pearson- Arastradero Preserve | 8:30 a.m. - 11:30 a.m. | Palo Alto | Santa Clara | Sign up |
| 9/13 | HandsOn San Diego | LEARN: Tree Treks - Informational Walks | 10:00 a.m. - 11:30 a.m. | Santee | San Diego | Sign up |
| 9/13 | North Coast California Native Plant Society | Meet the Native Plants @Farmers Market | 9:00 a.m. - 1:00 p.m. | Arcata | Humboldt | Sign up |
| 9/13 | OC Habitats | Santiago Park Clean-up & Restoration | 9:00 a.m. - 12:00 p.m. | Santa Ana | Orange | Sign up |
| 9/13 | One Seed At A Time | Fig Fest On The River | 12:00 a.m. - 4:00 p.m. | Red Bluff | Tehama | Sign up |
| 9/13 | Reuse Alliance | San Anselmo Repair Fair | 1:00 p.m. - 4:00 p.m. | San Anselmo | Marin | Sign up |
| 9/13 | San Anselmo Library | San Anselmo Repair Fair | 1:00 p.m. - 4:00 p.m | San Anselmo | Marin | Sign up |
| 9/13 | San Joaquin Chapter of The Wildlife Society | O'Neill Forebay Wildlife Area Bioblitz | 8:00 a.m. - 11:00 a.m. | Gustine | Merced | Sign up |
| 9/13 | Sonoma Ecology Center | Sugarloaf Reptiles (CA Biodiversity Week 2025) | 6:45 p.m. - 9:00 p.m. | Kenwood | Sonoma | Sign up |
| 9/13 | Sonoma Land Trust | BioBlitz on the Santa Rosa Southeast Greenway | 11:00 a.m. - 1:00 p.m. | Santa Rosa | Sonoma | Sign up |
| 9/13 | The Edible Schoolyard - Berkeley | Native Pollinator Corridor - Work & Learn Series | 9:00 a.m. - 1:00 p.m. | Berkeley | Alameda | Sign up |
| 9/13 | Tule River Parkway Association, Alta Peak Chapter of CA Native Plant Societ | Art and Science of Biodiversity | 9:00 a.m. - 12:00 p.m. | Poterville | Tulare | Sign up |
| 9/13 | University of California Davis Natural Reserve System | Cold Canyon Bioblitz | 8:00 a.m. - 12:00 p.m. | Winters | Yolo | Sign up |
| 9/13 | Verdant Venice Group | Cityscape Bioblitz, Venice, CA | 8:00 a.m. - 11:00 a.m. | Venice | Los Angeles | Sign up |
| 9/13 | Yosemite Climbing Association | Groveland Facelift | 8:00 a.m. - 3:00 p.m. | Groveland | Tuolumne | Sign up |
| 9/14 | Amigos de los Rios | Greening Jackson Elementary - Site Care | 8:00 a.m. - 11:00 a.m. | Altadena | Los Angeles | Sign up |
| 9/14 | Amigos de los Rios | Greening the San Gabriel River - Planting & Site Care | 8:00 a.m. - 11:00 a.m. | El Monte | Los Angeles | Sign up |
| 9/14 | California State Parks | California Biodiversity Park Tour | 11:00 a.m. - 12:00 p.m. | Sacramento | Sacramento | Sign up |
| 9/14 | California State Parks | Underwater BioBlitz at Point Lobos | 8:30 a.m. - 12:30 p.m. | Carmel | Monterey | Sign up |
| 9/14 | California State Parks | South Grove Guided Hike at Calaveras Big Trees State Park | 10:00 a.m. - 1:00 p.m. | Arnold | Calaveras | Sign up |
| 9/14 | California State Parks, Bay Area District | Biodiversi-tea Café and BioBlitz at Mount Tamalpais SP | 8:00 a.m. - 1:00 p.m. | Mill Valley | Marin | Sign up |
| 9/14 | East Bay Regional Park District | Shoreline BioBlitz​ | 10:00 a.m. - 12:00 p.m. | Martinez | Contra Costa | Sign up |
| 9/14 | East Bay Regional Park District | California Biodiversity Day in Sunol! | 9:00 a.m. - 12:00 p.m. | Sunol | Alameda | Sign up |
| 9/14 | East Bay Regional Park District | CA Biodiversity Week 2025 - Brushy Peak | 9:30 a.m. - 12:00 p.m. | Livermore | Alameda | Sign up |
| 9/14 | Friends of Ballona Wetlands | Nature Walk for Photographers | 10:00 a.m. - 12:00 p.m. | Playa Vista | Los Angeles | Sign up |
| 9/14 | Golden Gate Bird Alliance | Bird Curious at Glen Canyon Park | 9:00 a.m. - 11:00 a.m. | San Francisco | San Francisco | Sign up |
| 9/14 | Monterey Audubon Society | Beginning Birding at Asilomar State Beach & Conference Grounds | 9:00 a.m. - 12:00 p.m. | Pacific Grove | Monterey | Sign up |
| 9/14 | San Diego Bird Alliance | Silverwood After Sunset: Moth and Owl Outing | 6:30 p.m. - 9:30 p.m. | Lakeside | San Diego | Sign up |
| 9/14 | Santa Monica Mountains National Recreation Area | Beginners Nature Journaling in the Park | 9:30 a.m. - 11:00 a.m. | Calabasas | Calaveras | Sign up |
| 9/15 | City of Berkeley | Household Fire Weather Planning | 12:00 p.m. - 1:00 p.m. | Berkeley | Alameda | Sign up |
| 9/17 | California State Library and the California State Parks | Resilient CA Webinar: Jedediah Smith Redwoods - Salmon in the Smith River | 12:00 p.m. - 1:30 p.m. | Virtual | Virtual | Sign up |
| 9/17 | Pinyon Community Climate Action Network Community Open House | Pinyon Community Climate Action Network Community Open House | 6:00 p.m. - 8:30 p.m. | Bishop | Inyo | Sign up |
| 9/17 | UC Davis Arboretum and Public Garden | Walk With Warren | 12:00 p.m. - 1:00 p.m. | Davis | Yolo | Sign up |
| 9/17 | UCCE Master Gardener Program in Glenn County | Master Gardener Plant Clinic | 2:00 a.m. - 4:00 p.m. | Orland | Glenn | Sign up |
| 9/18 | Canopy | Mountain View Tree Care Training & Workshop | 8:00 a.m. - 1:00 p.m. | Mountain View | Santa Clara | Sign up |
| 9/18 | Town of Mammoth Lake | Trashy Thursdays | 5:00 p.m. - 6:00 p.m. | Mammoth Lakes | Mono | Sign up |
| 9/19 | Salmon River Restoration Council | 2025 Coastal Cleanup Day Site: Lower Salmon River Road | 10:00 a.m. - 2:00 p.m. | Somes Bar | Siskiyou | Sign up |
| 9/20 | Alpine Watershed Group | Creek Day | 9:00 a.m. - 12:00 p.m. | Markleeville | Alpine | Sign up |
| 9/20 | American River Conservancy | 2025 Coastal Cleanup Day Site: Hangtown Creek | 9:00 a.m. - 11:00 a.m. | Placerville | El Dorado | Sign up |
| 9/20 | American River Conservancy | 2025 Coastal Cleanup Day Site: Marshall Gold Discovery State Historic Park | 9:00 a.m. - 12:00 p.m. | Coloma | El Dorado | Sign up |
| 9/20 | American River Conservancy | 2025 Coastal Cleanup Day Site: Henningsen Lotus Park | 9:00 a.m. - 12:00 p.m. | Lotus | El Dorado | Sign up |
| 9/20 | American River Conservancy | 2025 Coastal Cleanup Day Site: Happy Valley | 9:00 a.m. - 12:00 p.m. | Pleasant Valley | El Dorado | Sign up |
| 9/20 | Amigos de los Rios | Greening the Rio Hondo Trail - Planting & Site Care | 8:00 a.m. - 11:00 a.m. | Arcadia | Los Angeles | Sign up |
| 9/20 | Arnold Rim Trail Association | Volunteer Trail Building Morning | 8:30 a.m. - 11:30 am | Hathaway Pines | Calaveras | Sign up |
| 9/20 | Bolsa Chica Land Trust | Bolsa Chica Land Trust Coastal Clean Up | 9:00 a.m. - 12:00 p.m. | Huntington Beach | Orange | Sign up |
| 9/20 | Butte Environmental Council | 38th Annual Bidwell Park & Chico Creeks Cleanup | 9:00 a.m - 12:00 p.m. | Chico | Butte | Sign up |
| 9/20 | California State Parks | 2025 Coastal Cleanup Day Site: Navarro Beach | 9:00 a.m. - 12:00 p.m. | Navarro | Mendocino | Sign up |
| 9/20 | California State Parks | 2025 Coastal Cleanup Day Site: San Buenaventura State Beach | 9:00 a.m. - 12:00 p.m. | Ventura | Ventura | Sign up |
| 9/20 | City of Fort Bragg | 2025 Coastal Cleanup Day Site: Glass Beach | 9:00 a.m. - 12:00 p.m. | Fort Bragg | Mendocino | Sign up |
| 9/20 | City of Oxnard | 2025 Coastal Cleanup Day Site: Oxnard Beach Park | 9:00 a.m. - 12:00 p.m. | Oxnard | Ventura | Sign up |
| 9/20 | City of Port Hueneme | 2025 Coastal Cleanup Day Site: Port Hueneme Beach | 9:00 a.m. - 12:00 p.m. | Port Hueneme | Ventura | Sign up |
| 9/20 | Critical Mass Arcata | Coastal Cleanup Day - Humboldt Bay Train North | 9:00 a.m. - 12:00 p.m. | Arcata | Humboldt | Sign up |
| 9/20 | Explore Ecology | 2025 Coastal Cleanup Day Site: Leadbetter Beach | 9:00 a.m. - 12:00 p.m. | Santa Barbara | Santa Barbara | Sign up |
| 9/20 | Friends of Auburn Ravine | 2025 Coastal Cleanup Day Site: Auburn Ravine | 9:00 a.m. - 12:00 p.m. | Lincoln | Placer | Sign up |
| 9/20 | HandsOn San Diego | ECO: Restore Olivia Canyon | 8:00 a.m. - 10:30 a.m. | San Diego | San Diego | Sign up |
| 9/20 | Heal The Bay | Coastal Clean Up Day | 9:00 a.m. - 12:00 p.m. | Various | Los Angeles | Sign up |
| 9/20 | Imperial Valley Food Bank | Let's Grow Salsa | 8:30 a.m. - 11:30 am | Imperial | Imperial | Sign up |
| 9/20 | Inland Empire Waterkeeper | Crest to Coast Cleanup Program (Inland Empire Waterkeeper's River and Creek Cleanup) | 9:00 a.m. - 11:00 a.m. | Riverside | Riverside | Sign up |
| 9/20 | Lake County Water Resources Department | Coastal Cleanup Day 2025 | 9:00 a.m. - 12:00 p.m. | Various | Lake | Sign up |
| 9/20 | Napa County Resource Conservation District | 2025 Napa County Coastal Cleanup Day | 9:00 a.m. - 12:00 p.m. | Various | Napa | Sign up |
| 9/20 | OC Habitats | OCH Restoration at Huntington Beach Wetlands Conservancy | 9:00 a.m. - 12:00 p.m. | Huntington Beach | Orange | Sign up |
| 9/20 | Pinyon Community Climate Action Network Community Open House | Great Sierra River Clean Up | 8:00 a.m. - 12:00 p.m. | Bishop | Inyo | Sign up |
| 9/20 | Putah Creek Council | Coastal Cleanup Day | 9:00 a.m. - 12:00 p.m. | Winters | Yolo | Sign up |
| 9/20 | Putah Creek Council | Coastal Cleanup Day | 9:00 a.m. - 12:00 p.m. | Davis | Yolo | Sign up |
| 9/20 | Redwood Community Action Agency | Coastal Cleanup Day - Samoa Power Poles to Fairhaven | 9:00 a.m. - 11:00 a.m. | Samoa | Humboldt | Sign up |
| 9/20 | Reuse Alliance | Bodega Bay Repair Fair + Clothing Swap | 1:00 p.m. - 4:00 p.m. | Bodega Bay | Sonoma | Sign up |
| 9/20 | San Francisco Public Library | Clothing Repair Clinic - Main Library | 11:00 a.m. - 1:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/20 | Solano Resource Conservation District | Solano County Coastal Cleanup Day | 9:00 a.m. - 12:00 p.m. | Various | Solano | Sign up |
| 9/20 | South Yuba River Citizens League | 2025 Coastal Cleanup Day Site: Lower Yuba: Shad Pad | 9:00 a.m. - 12:00 p.m. | Marysville | Yuba | Sign up |
| 9/20 | South Yuba River Citizens League | Annual Yuba River Cleanup | 9:00 a.m. - 12:00 p.m. | Various | Nevada | Sign up |
| 9/20 | South Yuba River Citizens League | 2025 Coastal Cleanup Day Site: South Yuba: Jones Bar | 9:00 a.m. - 12:00 p.m. | Nevada | Nevada | Sign up |
| 9/20 | Surfrider Humboldt | Coastal Cleanup Day - North Jetty Samoa Dunes | 9:00 a.m. - 12:00 p.m. | Samoa | Humboldt | Sign up |
| 9/20 | The Watershed Project | Coastal Cleanup Day: Shimada Friendship Park | 9:00 a.m. - 12:00 p.m. | Richmond | Contra Costa | Sign up |
| 9/20 | Ventura County Watershed Protection District | 2025 Coastal Cleanup Day Site: Silver Strand Beach | 9:00 a.m. - 12:00 p.m. | Oxnard | Ventura | Sign up |
| 9/20 | Ventura Suburban Kiwanis | 2025 Coastal Cleanup Day Site: Marina Park Beach | 9:00 a.m. - 12:00 p.m. | Ventura | Ventura | Sign up |
| 9/20 | Wishtoyo | 2025 Coastal Cleanup Day Site: Mugu Rock Beach | 9:00 a.m. - 12:00 p.m. | Malibu | Ventura | Sign up |
| 9/20 | Pacific Beach Coalition | CA Coastal Cleanup Day | 09:00 a.m. - 11:00 a.m. | Daly City | San Mateo | Sign up |
| 9/20 | Pacific Beach Coalition | CA Coastal Cleanup Day | 09:00 a.m. - 11:00 a.m. | Pacifica | San Mateo | Sign up |
| 9/20 | Pacific Beach Coalition | CA Coastal Cleanup Day | 09:00 a.m. - 11:00 a.m. | Montara | San Mateo | Sign up |
| 9/20 | Pacific Beach Coalition | CA Coastal Cleanup Day | 09:00 a.m. - 11:00 a.m. | Half Moon Bay | San Mateo | Sign up |
| 9/20 | Pacific Beach Coalition | CA Coastal Cleanup Day | 09:00 a.m. - 11:00 a.m. | Foster Ctiy | San Mateo | Sign up |
| 9/20 | Golden Gate Bird Alliance | White Crowned Sparrow Habitat Restoration at the Bison Paddock9/20/25 | 9:00 a.m. - 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/20 | California Coastal Commission | Coastal Cleanup Marina Yacht Harbor | 9:00 a.m. - 12:00 p.m. | San Francisco | San Francisco | Sign up |
| 9/20 | Refuse Refuse | KEEP Ocean Beach Clean | 10:00 a.m. - 11:30 a.m. | San Francisco | San Francisco | Sign up |
| 9/21 | Amigos de los Rios | Greening the San Gabriel River - Planting & Site Care | 8:00 a.m. - 11:00 a.m. | South El Monte | Los Angeles | Sign up |
| 9/21 | Creative Art Events | Trashion Show Long Beach- Volunteer | 5:00 p.m. - 7:30 p.m. | Long Beach | Los Angeles | Sign up |
| 9/21 | North Coast Regional Land Trust | Stewardship Work Day in Partnership with the Humboldt Trails Council | 9:00 a.m. - 12:00 p.m. | Eureka | Humboldt | Sign up |
| 9/21 | Berkeley Sun Day | Berkeley Sun Day 2025 | 2:00 p.m. - 5:00 p.m. | Berkeley | Alameda | Sign up |
| 9/24 | California Native Plant Society | California Native Plant Society Volunteer Workday | 9:30 a.m. - 12:30 a.m. | Bodega Bay | Sonoma | Sign up |
| 9/24 | Yosemite Climbing Association | Yosemite Facelift | 8:00 a.m. - 4:00 p.m. | Yosemite | Mariposa | Sign up |
| 9/25 | Climate HQ, San Francisco State | Climate HQ Student Breakfast | 9:30 a.m. - 11:30 a.m. | San Francisco | San Francisco | Sign up |
| 9/25 | Town of Mammoth Lake | Trashy Thursdays | 5:00 p.m. - 6:00 p.m. | Mammoth Lakes | Mono | Sign up |
| 9/26 | San Diego Canyonlands | Sips & Sagebrush at Mission Hills Canyon | 9:00 a.m. - 11:00 a.m. | San Diego | San Diego | Sign up |
| 9/26 | Santa Monica Mountains Fund | FREE PLANT FRIDAYS! - Native Plant Nursery Volunteering | 9:00 a.m. - 2:00 p.m. | Thousand Oaks | Ventura | Sign up |
| 9/27 | Agua Hedionda Lagoon Foundation | National Public Lands Day | 9:00 a.m. - 12:00 p.m. | Carlsbad | San Diego | Sign up |
| 9/27 | AHEAD With Horses | Landscape Project at AHEAD With Horses | 9:00 a.m. - 12:00 p.m. | Lake View Terrace | Los Angeles | Sign up |
| 9/27 | Amigos de los Rios | Greening the San Gabriel River - Planting & Site Care | 8:00 a.m. - 11:00 a.m. | El Monte | Los Angeles | Sign up |
| 9/27 | Breathe Southern California | Let’s Build a Garden Together at Rio Hondo College | 9:00 a.m. - 12:30 p.m. | Whittier | Los Angeles | Sign up |
| 9/27 | California Native Plant Society - Central Sierra Chapter | Gardening with California Native Plants | 9:00 a.m. - 12:00 p.m. | Jackson | Amador | Sign up |
| 9/27 | Carthay School of Env. Studies & STEM Magnet | Carthay School Greening Project | 9:00 a.m. - 12:00 p.m. | Los Angeles | Los Angeles | Sign up |
| 9/27 | City of Los Angeles, Office of Mayor Karen Bass & Hope the Mission | A day of service with Mayor Karen Bass and Hope the Mission | 9:00 a.m. - 12:00 p.m. | Los Angeles | Los Angeles | Sign up |
| 9/27 | Community Action for a Sustainable Alameda | City of Alameda Sea Level Rise Planning Fair | 11:00 a.m. - 2:00 p.m. | Alameda | Alameda | Sign up |
| 9/27 | Community Magnet Charter School (LAUSD) | Community Magnet Charter School Campus Beautification | 9:00 a.m. - 12:00 p.m. | Los Angeles | Los Angeles | Sign up |
| 9/27 | Fairburn Avenue Elementary Boosters | Beautification of Fairburn Avenue Elementary (LAUSD) | 9:00 a.m. - 12:00 p.m. | Los Angeles | Los Angeles | Sign up |
| 9/27 | Friends of the Los Angeles River | Habitat Restoration with Friends of the LA River (FoLAR) | 9:00 a.m. - 12:00 p.m. | Van Nuys | Los Angeles | Sign up |
| 9/27 | Good Earth Community Garden | Every Day Is Earth Day at Good Earth | 9:00 a.m. - 12:00 p.m. | Los Angeles | Los Angeles | Sign up |
| 9/27 | HandsOn San Diego | ECO: Creek Day | 8:30 a.m. - 12:00 p.m. | National City | San Diego | Sign up |
| 9/27 | Housing Authority of the City of Los Angeles | Estrada Courts Community Clean Up | 9:00 a.m. - 12:00 p.m. | Los Angeles | Los Angeles | Sign up |
| 9/27 | Humboldt Unitarian Universalists Fellowship | Coastal Cleanup Day - Arcata Marsh | 11:00 a.m. - 2:00 p.m. | Arcata | Humboldt | Sign up |
| 9/27 | LandPaths | Volunteer Stewardship Day at Grove of Old Trees | 9:00 a.m. - 1:00 p.m. | Occidental | Sonoma | Sign up |
| 9/27 | Lassen Land and Trails Trust | Susanville Community Action Day in honor of Nat'l Public Lands Day! | 9:00 a.m. - 12:00 p.m. | Susanville | Lassen | Sign up |
| 9/27 | Northcoast Environmental Center | Coastal Cleanup Day - NEC Block | 11:00 a.m. - 2:00 p.m. | Arcata | Humboldt | Sign up |
| 9/27 | Orange County Pride | Orange County Pride Festival & Parade | Various | Costa Mesa | Orange | Sign up |
| 9/27 | Puente Latino Association | Gen Z Youth for Change | 10:00 a.m - 1:00 p.m. | Long Beach | Los Angeles | Sign up |
| 9/27 | Redwood National & State Parks | Coastal Cleanup Day - Freshwater Beach | 10:00 a.m. - 1:00 p.m. | Orick | Humboldt | Sign up |
| 9/27 | Sage Hill at UCLA | Sage Hill Fall 2025 Clean Up | 9:00 a.m. - 12:00 p.m. | Los Angeles | Los Angeles | Sign up |
| 9/27 | Say Love | Remembering 9/11 Through Service | 7:30 a.m. - 1:00 p.m. | Yuba City | Sutter | Sign up |
| 9/27 | The Midnight Mission | Soup Kitchen Volunteer | Various | Los Angeles | Los Angeles | Sign up |
| 9/27 | The Watershed Project | Wildcat Creek Clean Up | 9:00 a.m. - 12:00 p.m. | Richmond | Contra Costa | Sign up |
| 9/27 | TreePeople | San Francisquito Canyon Chaparral Restoration | 9:00 a.m. - 11:00 a.m. | Beverly Hills | Los Angeles | Sign up |
| 9/27 | TreePeople | Shade and fruit tree giveaway at Canoga Park Farmers Market | 9:00 a.m. - 12:00 p.m. | Canoga Park | Los Angeles | Sign up |
| 9/27 | Verdant Venice Group | Venice Corridor Creation | 9:00 a.m. - 11:00 a.m. | Los Angeles | Los Angeles | Sign up |
| 9/27 | West Slope Foundation | Disaster Preparedness Workshop | 9:00 a.m. - 1:00 p.m. | Mt. Aukum | El Dorado | Sign up |
| 9/27 | Westside Food Bank | Box Packing at Westside Food Bank | 9:00 a.m. - 11:00 a.m. | Santa Monica | Los Angeles | Sign up |
| 9/27 | Westwood Greenway, Inc. | Sustainability tour and Stewardship work day at the Westwood Greenway | 9:00 a.m. - 12:00 p.m. | Los Angeles | Los Angeles | Sign up |
| 9/27 | Willowbrook Community Garden | Garden Clean Up at Willowbrook Community Garden | 9:00 a.m. - 12:00 p.m. | Los Angeles | Los Angeles | Sign up |
| 9/27 | Zawadi Cultural Collective | Food Distribution with Zawadi Cultural Collective | 9:00 a.m. - 12:00 p.m. | Winnetka | Los Angeles | Sign up |
| 9/27 | Refuse Refuse | KEEP Ocean Beach Clean | 10:00 a.m. - 11:30 a.m. | San Francisco | San Francisco | Sign up |
| 9/28 | U.S. Arts and Design Irvine | 2025 Biodiversity and Climate Action (youth art show) | 2:30 p.m. - 4:00 p.m. | Irvine | Orange County | Sign up |
| 9/28 | REAP Climate Center | Volunteer Day & Open House at REAP Climate Center | 10:00 a.m. - Sunset | Alameda | Alameda | Sign up |
| 9/30 | UCCE Master Gardener of Colusa County | Become A Master Gardener | 9:00 a.m. - 12:00 p.m. | Colusa | Colusa | Sign up |
| Ongoing | Colusa County Library | General Library, Literacy, & Children's Programs | Ongoing | Colusa | Colusa | Sign up |
| Ongoing | Hands On Central Valley | Become An AmeriCorps Senior Volunteer | Various | Various | Madera | Sign up |
| Ongoing | Sierra County | Become A Volunteer FireFighter or EMT | Various | Various | Sierra | Sign up |
| Ongoing | White Pony Express | Food Rescue Volunteering | Various | Concord | Contra Costa | Sign up |
| Various | Meals on Wheels Solano County | Volunteer With Meals On Wheels | 9:00 a.m. - 1:00 p.m. | Fairfield | Solano | Sign up |
| Various | Move LA | Transit Month - Move LA | Various | Various | Los Angeles | Sign up |
| Various | St. Brigid Community Outreach Center | St. Brigid Community Outreach Center | 8:30 a.m. - 12:30 p.m. | Hanford | Kings | Sign up |
