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Help IMBA Open More Singletrack on Historic Mt. Tam

Public Lands Initiative Campaign

California State Parks has announced a proposal to open singletrack for mountain biking in Marin County, on the shoulders of Mt. Tamalpais. The agency plans to permit bicycle use on the four mile Bill’s Trail segment and is currently compiling an environmental impact report, required to re-open the historic trail.

This landmark opportunity is the direct result of more than three years of partnership building with the parks department by IMBA California, Access4Bikes and the Bicycle Trails Council of Marin. A successful opening of Bill’s Trail will set the stage for bicycle access to several other singletrack trails in Marin, which is widely considered to be one of the birthplaces of modern mountain biking. Despite its historic role, Marin has seen precious few opportunities for mountain biking open to the public in recent years.

Call to Action!

A huge thank you to all of you who submitted comments to California State Parks on the Draft Environmental Impact Report for Bill's Trail. 519 people weighed in through our action alert on behalf of mountain bicycling!

IMBA is working to rally and organize the mountain bike community to support California State Parks in this effort. We need your help today! Please sign up to be informed about new trail opportunities in California!

IMBA Clubs Active in this Campaign:


Bicycle Trails Council of Marin

Forest Knolls Freewheelers

Email tom [dot] ward [at] imba [dot] com to add your club to this list.

What Others are Saying:

Send any articles, blogs or quotes to aimee [dot] ross [at] imba [dot] com to post here.


For more information please contact:

About IMBA's Public Lands Initiative:

The Public Lands Initiative is IMBA's effort to better organize local cycling communities and the bike industy to rally around bike friendly policies and public lands protection. Read more about the PLI.

Please consider contributing to our important campaign efforts.

Share Your Stories!

Please use the comment section below to share your personal stories of great rides, personal achievement or even that epic crash on these trails.


Park Bill's Trail

I like this.
this is the best opportunities for people.
Marin has seen precious few opportunities for mountain biking open to the public in recent years.

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