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Restoring Bolinas Lagoon
Major milestone: Restored waterways, safer roads, thousands of native plants >>
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Learn more about our Marin Wildlife Watch program >>
More Community Science >>
Photo: One Tam's Marin Wildlife Watch program
Hope for Monarch Butterflies in Marin
Find out how you can help >>
'Rooted in Connection' guided hike series
Explore the stories and
science behind healthy forests
Prescribed fire
Bringing health and balance
back to the Mt. Tam landscape
Photo: Marin Water
Forest trails in the Bay Area
Best hikes through redwoods & more
Explore now
Photo: Kirke Wrench
News and Events
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Support One Tam
to care for Mt. Tam
Join One Tam today
for a healthy Mt. Tam tomorrow
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Photo by Lieven Leroy
Explore
Learn about Mt. Tamalpais and get trail tips
Support
Join One Tam to support our work and your mountain
Volunteer
Get involved in habitat restoration, community science, and more!
Events
See all One Tam partner events
One Mountain, One Team
With its sweeping views, miles of trails, and ancient forests, Mt. Tamalpais is a beloved local treasure. But the mountain also faces many challenges such as invasive weeds, forest diseases,
and the effects of climate change.
The One Tam partnership mobilizes the resources of the National Park Service, California State Parks, The Marin Municipal Water District, Marin County Parks and Golden Gate National Parks Conservancy
to ensure a vibrant future for Mt. Tamalpais.
Join Us!
Upcoming Events
April 22, 2026
Mt. Tamalpais Earth Day Stewardship
Source: One Tam Calendar
Providing us with drinking water, incredible trails, habitat for beloved species, and so much more: Mt.
April 25, 2026
Spring Flowers and Fire Bioblitz
Source: One Tam Calendar
In partnership with OneTam, celebrate the
April 25, 2026
Sunrise Hike
Source: Marin County Parks
Deer Island Preserve
Saturday, April 25, 2026, 6:30 – 8am
April 26, 2026
Mount Burdell Wildflowers
Source: Marin County Parks
Mount Burdell Preserve
Sunday, April 26, 2026, 10am – 2pm
April 29, 2026
Chimney Rock Wildflowers
Source: Marin County Parks
Point Reyes National Seashore
Wednesday, April 29, 2026, 10am – 2pm
May 2, 2026
Mt. Tamalpais Trail Stewardship Day With Marin Water
Marin Water Volunteer Events Calendar
May 3, 2026
The Baltimore Canyon Story
Source: Marin County Parks
Baltimore Canyon Summit Preserve
Sunday, May 3, 2026, 9 – 11am
May 4, 2026
Johnstone Trail
Source: Marin County Parks
Tomales Bay State Park
Monday, May 4, 2026, 10am – 2pm
May 6, 2026
Invasive Plant Patrol
Source: One Tam Calendar
When:
Wednesdays, 10 am–2:30 pm; Registration Required
May 6, 2026
Senior Stroll: Earthquake Trail
Source: Marin County Parks
Point Reyes National Seashore
Wednesday, May 6, 2026, 10am – 12pm
May 10, 2026
Mount Burdell Birds
Source: Marin County Parks
Mount Burdell Preserve
Sunday, May 10, 2026, 10am – 2pm
May 10, 2026
Mother's Day Flowers
Source: Marin County Parks
McNears Beach Park
Sunday, May 10, 2026, 11:30am – 1pm
May 12, 2026
Loma Alta: Blossoms and Birds
Source: Marin County Parks
Loma Alta Preserve
Tuesday, May 12, 2026, 10am – 2pm
May 13, 2026
Invasive Plant Patrol
Source: One Tam Calendar
When:
Wednesdays, 10 am–2:30 pm; Registration Required
May 16, 2026
Habitat Restoration
Marin Water Volunteer Events Calendar
May 17, 2026
Indian Valley
Source: Marin County Parks
Indian Valley Preserve
Sunday, May 17, 2026, 10am – 2pm
May 17, 2026
Juice with a Ranger
Source: Marin County Parks
Deer Island Preserve
Sunday, May 17, 2026, 11am – 1pm
May 19, 2026
Tennessee Valley Tuesday Stewards
Source: One Tam Calendar
When:
3rd & 5th Tuesdays, 10 am–2 pm
May 20, 2026
Abbotts Lagoon Plants
Source: Marin County Parks
Point Reyes National Seashore
Wednesday, May 20, 2026, 10am – 2pm
May 24, 2026
Stargazing at Mount Burdell
Source: Marin County Parks
Mount Burdell Preserve
Saturday, May 23, 2026, 8:15 – 10:15pm
June 16, 2026
Tennessee Valley Tuesday Stewards
Source: One Tam Calendar
When:
3rd & 5th Tuesdays, 10 am–2 pm
June 30, 2026
Tennessee Valley Tuesday Stewards
Source: One Tam Calendar
When:
3rd & 5th Tuesdays, 10 am–2 pm
All Events
Featured Work
Monarch Habitat Enhancement
One Tam partners are now working to identify monarch butterfly overwintering and breeding habitat for restoration in the region, and to plan enhancement efforts.
Roy’s Redwoods
Long loved by the San Geronimo Valley community, Roy’s Redwoods Open Space Preserve offers visitors an immersive experience in an old-growth redwood grove.
Bothin Marsh
With climate change and sea level rise, flooding is increasing in frequency and duration throughout Bothin Marsh - this project is creating a shared community vision for its future.
All Programs & Projects
What
People Say
I walk out of this program with more perspective and a powerful mindset, to get out there and make a change. The One Tam LINC high school program made me realize that this is exactly what I want to do with my life: be outdoors and explore, while at the same time giving back to my community.
Nhi Nguyen
LINC 2018 Student
The mountain gives to all of us selflessly and constantly. The challenge is for each of us to consider in what way we can repay the generosity. Invent something, donate, pull weeds, shore up trails, volunteer with One Tam and you will become a Tamalpaian.
Peter Coyote
Co-author and Narrator, The Invisible Peak