One Tam

Hiking with a mission – help find and remove new infestations of invasive weeds while exploring the parks.

Hiking with a mission – help find and remove new infestations of invasive weeds while exploring the parks.

Help restore and protect critical natural areas from the Marin Headlands to Bolinas Ridge.

Help restore and protect critical natural areas from the Marin Headlands to Bolinas Ridge.

Experience the majesty of the redwoods while lending your hand at Muir Woods!

Hiking with a mission – help find and remove new infestations of invasive weeds while exploring the parks.

Become a steward of the Mt Tamalpais Watershed! Join our work day and naturalist walk.

Become a steward of the Mt Tamalpais Watershed! Join our work day and naturalist walk.

Become a steward of the Mt Tamalpais Watershed! 

Join us to discover the mushrooms of Roy’s Redwoods Preserve.