save the date May 4th, 2019

Tickets Available now. $35 for first 100!

Your Favorite Bike & Brew Fest Is Coming!


Ales and Trails is May 4th, 2019

One of Marin’s biggest bike parties and A4B’s biggest annual fundraiser! Group rides, demos, unlimited beer tastings, live music, vendors, kid events and more. Go here for more info.

Trail Closures

Marin County Open Space occasionally closes trails due to seasonal weather conditions, maintenance or new construction. Go here for up to date info on MCOSD trails.

Please respect Camp Tamarancho trails and avoid riding during or shortly after heavy rains. For more info, go here.

Marin MTB news

Marin MTB Events

A4B & A4BF Monthly Board Meetings

Who: Everyone is welcome!

What: Discuss current topics, new trail proposals, trail work, ongoing and future projects, A4B sponsored events, finances, hear from guest speakers, learn about volunteering opportunities and more.

When: Monthly every third Monday in the back room of Iron Springs in Fairfax at 6:30 PM.