Home

Explore
Explore

Learn about our work and get trail tips

Support
Support

Join One Tam to support our work and your mountain

Volunteer
Volunteer

Get involved in habitat restoration, community science, and more!

Events
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 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, Marin Water, Marin County Parks, and Golden Gate National Parks Conservancy to ensure a vibrant future for Mt. Tamalpais. 

Join Us!

California State Parks
Marin County Parks
Golden Gate National Parks Conservancy
Marin Municipal Water District
National Park Service

Upcoming Events

 
Habitat Restoration Team
Source: One Tam Calendar

When: Sundays, 9:30 am–2:30 pm

 
Bear Valley
Source: Marin County Parks
Point Reyes National Seashore
Wednesday, June 24, 2026, 10am – 2pm
 
Muir Woods Night Tour
Source: One Tam Calendar

Ever wondered what Muir Woods is like after the park closes?

 
Open Space After Dark
Source: Marin County Parks
Ring Mountain Preserve
Friday, June 26, 2026, 8:15 – 9:15pm
 
Belonging in Nature: Queer and Trans in the Nurseries
Source: One Tam Calendar

When: Saturday, June 27th, 2026, 10am – 1:00pm

 
Juice with a Ranger
Source: Marin County Parks
Rush Creek Preserve
Saturday, June 27, 2026, 12:30 – 2:30pm
 
Family Walk: Blackstone Canyon
Source: Marin County Parks
Marinwood
Tuesday, June 30, 2026, 10am – 12pm
 
Tennessee Valley Tuesday Stewards
Source: One Tam Calendar

When: 3rd & 5th Tuesdays, 10 am–2 pm

 
Climate Conversations: From Emotions to Action
Source: One Tam Calendar

Week 1 (Sunday, July 5, 2026) — Community, Climate Emotions & Expression 

 
Indian Tree
Source: Marin County Parks
Indian Tree Preserve
Sunday, July 5, 2026, 9am – 2pm
 
Senior Stroll: Tomales Bay State Park
Source: Marin County Parks
Tomales Bay State Park
Tuesday, July 7, 2026, 10am – 12pm
 
Kites n' Kites
Source: Marin County Parks
Upton Beach
Saturday, July 11, 2026, 12 – 2pm
 
The Road to Becoming a Ranger
Source: Marin County Parks
Deer Island Preserve
Sunday, July 12, 2026, 10:30am – 12:30pm
 
Climate Conversations: From Emotions to Action
Source: One Tam Calendar

Week 2 (Sunday, July 12, 2026) — Climate Change & Climate Symptoms: Local Experiences 

 
Battery Spencer Clean-up
Source: One Tam Calendar

When: Wednesday, July 15, 2026; 9:00am – Noon.

 
Rock Spring Guided Hike (Rooted in the Watershed Series)

Rooted in the Watershed Guided Hike Event Series:

 
Marin Headlands Nursery
Source: One Tam Calendar

When: Saturday, July 18th, 10:00 am–1:00pm. 

 
Climate Conversations: From Emotions to Action
Source: One Tam Calendar

Week 3 (Sunday, July 19, 2026) — Zooming Out: Solutions & Collective Action 

 
Tennessee Valley Tuesday Stewards
Source: One Tam Calendar

When: 3rd & 5th Tuesdays, 10 am–2 pm

 
Tennessee Valley Guided Hike (Rooted in the Watershed Series)

Rooted in the Watershed Event Series:

 
Climate Conversations: From Emotions to Action
Source: One Tam Calendar

Week 4 (Sunday, July 26, 2026) — Field Trip: Nature, Reflection & Art   

 
Tennessee Valley Tuesday Stewards
Source: One Tam Calendar

When: 3rd & 5th Tuesdays, 10 am–2 pm

 
Marin Headlands Nursery
Source: One Tam Calendar

When: Saturday, August 22nd, 10:00 am–1:00pm. 

 
Belonging in Nature: Queer and Trans in the Nurseries
Source: One Tam Calendar

When: Saturday, September 12th, 2026, 10am – 1:00pm

 
Tennessee Valley Tuesday Stewards
Source: One Tam Calendar

When: 3rd & 5th Tuesdays, 10 am–2 pm

 
Tennessee Valley Tuesday Stewards
Source: One Tam Calendar

When: 3rd & 5th Tuesdays, 10 am–2 pm

 
Tennessee Valley Tuesday Stewards
Source: One Tam Calendar

When: 3rd & 5th Tuesdays, 10 am–2 pm

 
Tennessee Valley Tuesday Stewards
Source: One Tam Calendar

When: 3rd & 5th Tuesdays, 10 am–2 pm

 
Tennessee Valley Tuesday Stewards
Source: One Tam Calendar

When: 3rd & 5th Tuesdays, 10 am–2 pm

 
Tennessee Valley Tuesday Stewards
Source: One Tam Calendar

When: 3rd & 5th Tuesdays, 10 am–2 pm

All Events

Featured Work

Path beside the base of an enormous redwood tree
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
Because climate change is causing sea level rise, flooding is intensifying at Bothin Marsh. This project is creating a shared community vision for its future.
Monarch Habitat Enhancement
One Tam partners improving monarch butterfly overwintering and breeding habitat for restoration at key park sites.

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