One Tam

California Newt
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What role can you play in scientific research and monitoring on Mt. Tam?
Eriogonum luteolum, Mt. Tam
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Wondering what’s growing on Mt. Tam while we shelter-in-place? Join One Tam science expert Rachel Kesel to discover some of the tiny and tough plants growing on Mt. Tam’s rocky serpentine soils.
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Get ready for City Nature Challenge and celebrate the 50th anniversary of Earth Day by learning about nature near you and gaining practical skills for nature observation around your home and neighborhood.
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Get ready for City Nature Challenge and celebrate the 50th anniversary of Earth Day by learning more about community (citizen) science and the importance of being a naturalist in the 21st century.
One Tam staff count vegetation near lake.
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Hal Brown Park at Creekside
The creation of Earth Day on April 22, 1970 marked what many consider to be the birth of the environmental movement.
Trail work on the Heather Cutoff Trail on National Trails Day
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Hal Brown Park at Creekside
Come join Marin County Parks and One Tam in this community-based effort to improve habitat while preparing for sea level rise.
Trail work on the Heather Cutoff Trail on National Trails Day
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Hal Brown Park at Creekside
Come join Marin County Parks and One Tam in this community-based effort to improve habitat while preparing for sea level rise.
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Kayak along the tidal marshes in Richardson Bay and learn about the history of Bothin Marsh and how Marin County Parks and One Tam are planning for sea level rise.
Smoky-gilled hypholoma mushroom
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Lake Lagunitas Parking Lot
Join Marin Municipal Water District, One Tam and the California Academy of Sciences at Lake Lagunitas to investigate mushroom biodiversity in this mycoblitz. Hone your naturalist skills, participate in community (citizen) projects through the North American Mycoflora Project and iNaturalist and become our scientific collaborator for a day!
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Samuel P. Taylor State Park
Join us for a habitat restoration project in Samuel P. Taylor State Park!