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.
Home
-
News and Events -
Follow the Tam Van! -
Support One Tam
to care for Mt. TamJoin One Tam today
for a healthy Mt. Tam tomorrowPhoto by Lieven Leroy
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: 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
Deer Island Open Space Preserve
Saturday, August 2, 2025, 9 – 10:30am
Saturday, August 2, 2025, 9 – 10:30am
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: Marin County Parks
Point Reyes National Seashore
Monday, August 4, 2025, 10am – 2pm
Monday, August 4, 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
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
When: Wednesdays, 10 am–2:30 pm; Registration Required
Source: Marin County Parks
Point Reyes National Seashore
Wednesday, August 6, 2025, 10am – 1pm
Wednesday, August 6, 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: 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
Friday, August 8, 2025, 5:30 – 7:30pm
Source: Marin County Parks
Indian Valley Preserve
Saturday, August 9, 2025, 1 – 2:30pm
Saturday, August 9, 2025, 1 – 2:30pm
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
McNears Beach Park
Sunday, August 10, 2025, 10am – 12pm
Sunday, August 10, 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
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: 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
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
Deer Island Preserve
Sunday, August 17, 2025, 9 – 10:30am
Sunday, August 17, 2025, 9 – 10:30am
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: Marin County Parks
Point Reyes National Seashore
Tuesday, August 19, 2025, 10am – 2pm
Tuesday, August 19, 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
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
Join a Muir Woods Ranger in a grove of towering Coast Redwoods for a 15-minute talk.
Source: Marin County Parks
Upton Beach
Saturday, August 23, 2025, 10am – 12pm
Saturday, August 23, 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: Marin County Parks
Stafford Lake Park, Area 2
Saturday, August 23, 2025, 11am – 12:30pm
Saturday, August 23, 2025, 11am – 12:30pm
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
Santa Margarita Island Preserve
Sunday, August 24, 2025, 10 – 11:30am
Sunday, August 24, 2025, 10 – 11:30am
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: 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
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: Wednesdays, 10 am–2:30 pm; Registration Required
Marin Water
When: First Saturday of every month, September until December 9 a.m.-2 p.m.
Source: One Tam Calendar
When: Wednesdays, 10 am–2:30 pm; Registration Required
Source: One Tam Calendar
When: 1st, 3rd, & 5th Tuesdays, 10 am–2 pm
Source: One Tam Calendar
When: Wednesdays, 10 am–2:30 pm; Registration Required
Source: One Tam Calendar
When: Wednesdays, 10 am–2:30 pm; Registration Required
Source: One Tam Calendar
When: 1st, 3rd, & 5th Tuesdays, 10 am–2 pm
Source: One Tam Calendar
When: Wednesdays, 10 am–2:30 pm; Registration Required
Marin Water
When: First Saturday of every month, September until December 9 a.m.-2 p.m.
Source: One Tam Calendar
When: 1st, 3rd, & 5th Tuesdays, 10 am–2 pm
Source: One Tam Calendar
When: Wednesdays, 10 am–2:30 pm; Registration Required
Source: One Tam Calendar
When: Wednesdays, 10 am–2:30 pm; Registration Required
Source: One Tam Calendar
When: 1st, 3rd, & 5th Tuesdays, 10 am–2 pm
Source: One Tam Calendar
When: Wednesdays, 10 am–2:30 pm; Registration Required
Source: One Tam Calendar
When: Wednesdays, 10 am–2:30 pm; Registration Required
Source: One Tam Calendar
When: 1st, 3rd, & 5th Tuesdays, 10 am–2 pm
Source: One Tam Calendar
When: Wednesdays, 10 am–2:30 pm; Registration Required
Source: One Tam Calendar
When: Wednesdays, 10 am–2:30 pm; Registration Required
Source: One Tam Calendar
When: 1st, 3rd, & 5th Tuesdays, 10 am–2 pm
Source: One Tam Calendar
When: Wednesdays, 10 am–2:30 pm; Registration Required
Source: One Tam Calendar
When: Wednesdays, 10 am–2:30 pm; Registration Required
Source: One Tam Calendar
When: 1st, 3rd, & 5th Tuesdays, 10 am–2 pm
Source: One Tam Calendar
When: Wednesdays, 10 am–2:30 pm; Registration Required
Source: One Tam Calendar
When: Wednesdays, 10 am–2:30 pm; Registration Required
Source: One Tam Calendar
When: 1st, 3rd, & 5th Tuesdays, 10 am–2 pm
Source: One Tam Calendar
When: Wednesdays, 10 am–2:30 pm; Registration Required
Source: One Tam Calendar
When: Wednesdays, 10 am–2:30 pm; Registration Required
Source: One Tam Calendar
When: 1st, 3rd, & 5th Tuesdays, 10 am–2 pm
Source: One Tam Calendar
When: Wednesdays, 10 am–2:30 pm; Registration Required
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