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.
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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
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: Marin County Parks
Point Reyes National Seashore
Tuesday, June 17, 2025, 10am – 2pm
Tuesday, June 17, 2025, 10am – 2pm
Source: One Tam Calendar
When: 1st, 3rd, & 5th Tuesdays, 10 am–2 pm
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
When: Wednesdays, 10 am–2:30 pm; Registration Required
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Follow the Tam Van! to various park sites and discover how our forests are changing—and how yo
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: Marin County Parks
Indian Valley Preserve
Sunday, June 22, 2025, 10am – 2pm
Sunday, June 22, 2025, 10am – 2pm
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: Marin County Parks
Marinwood
Wednesday, June 25, 2025, 10am – 12pm
Wednesday, June 25, 2025, 10am – 12pm
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Follow the Tam Van! to various park sites and discover how our forests are changing—and how yo
Source: One Tam Calendar
Follow the Tam Van! to various park sites and discover how our forests are changing—and how yo
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: Marin County Parks
Roy's Redwoods Preserve
Sunday, June 29, 2025, 11am – 1pm
Sunday, June 29, 2025, 11am – 1pm
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
When: 1st, 3rd, & 5th Tuesdays, 10 am–2 pm
Source: Marin County Parks
Tomales Bay State Park
Tuesday, July 1, 2025, 10am – 12pm
Tuesday, July 1, 2025, 10am – 12pm
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
When: Wednesdays, 10 am–2:30 pm; Registration Required
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Follow the Tam Van! to various park sites and discover how our forests are changing—and how yo
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Follow the Tam Van! to various park sites and discover how our forests are changing—and how yo
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: Marin County Parks
Tomales Bay State Park
Tuesday, July 8, 2025, 10am – 2pm
Tuesday, July 8, 2025, 10am – 2pm
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Follow the Tam Van! to various park sites and discover how our forests are changing—and how yo
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: Marin County Parks
Indian Tree Preserve
Sunday, July 13, 2025, 10am – 1pm
Sunday, July 13, 2025, 10am – 1pm
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: Marin County Parks
San Geronimo Park
Monday, July 14, 2025, 10am – 12pm
Monday, July 14, 2025, 10am – 12pm
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
When: 1st, 3rd, & 5th Tuesdays, 10 am–2 pm
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: Marin County Parks
Point Reyes National Seashore
Wednesday, July 16, 2025, 10am – 2pm
Wednesday, July 16, 2025, 10am – 2pm
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Follow the Tam Van! to various park sites and discover how our forests are changing—and how yo
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Follow the Tam Van! to various park sites and discover how our forests are changing—and how yo
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Follow the Tam Van! to various park sites and discover how our forests are changing—and how yo
Source: One Tam Calendar
Follow the Tam Van! to various park sites and discover how our forests are changing—and how yo
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
When: 1st, 3rd, & 5th Tuesdays, 10 am–2 pm
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
When: 1st, 3rd, & 5th Tuesdays, 10 am–2 pm
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
When: 1st, 3rd, & 5th Tuesdays, 10 am–2 pm
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: One Tam Calendar
When: 1st, 3rd, & 5th Tuesdays, 10 am–2 pm
Source: One Tam Calendar
When: 1st, 3rd, & 5th Tuesdays, 10 am–2 pm
Source: One Tam Calendar
When: 1st, 3rd, & 5th Tuesdays, 10 am–2 pm
Source: One Tam Calendar
When: 1st, 3rd, & 5th Tuesdays, 10 am–2 pm
Source: One Tam Calendar
When: 1st, 3rd, & 5th Tuesdays, 10 am–2 pm
Source: One Tam Calendar
When: 1st, 3rd, & 5th Tuesdays, 10 am–2 pm
Source: One Tam Calendar
When: 1st, 3rd, & 5th Tuesdays, 10 am–2 pm
Source: One Tam Calendar
When: 1st, 3rd, & 5th Tuesdays, 10 am–2 pm
Source: One Tam Calendar
When: 1st, 3rd, & 5th Tuesdays, 10 am–2 pm
Source: One Tam Calendar
When: 1st, 3rd, & 5th Tuesdays, 10 am–2 pm
Featured Work
One Tam partners are now working to identify monarch butterfly overwintering and breeding habitat for restoration in the region, and to plan enhancement efforts.
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.
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