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A Community for Biking in Marin Join Us A Community
Meet the people behind MCBC’s programs and advocacy
Since 1998, MCBC has brought over $100 million to Marin for cycling infrastructure — and we're just getting started.
200+ bikes given to Marin students. A youth development program built on confidence, connection, and community.
Every MCBC event
Dirt Fondo 2026 is back for another year of outdoor off-road adventure! Mark your calendar for Saturday, August 8, 2026.
Large projects succeed through steady, consistent community involvement — at meetings, in public comment, and in letters to local leaders.
Every dollar goes directly to advocating for safer streets, better trails, and a more bike-friendly Marin for everyone.
MCBC hosts several rides throughout the year — find them on our calendar. The routes below are classic Marin rides provided by Studio Velo
Dirt Fondo 2026 is back for another year of outdoor off-road adventure! Mark your calendar for Saturday, August 8, 2026.
Support a safe, flat, car-free connection between Mill Valley and Corte Madera.
A Community for Biking in Marin Join Us A Community
Marin County Board of Supervisors receives petition to move the Alto Tunnel project forward, signed by over 2,000
Imagine packing your bags, getting on your bike, and heading out of town on a quiet bike path. A few days later, that same path has carried you to another city hundreds of miles away, without having to navigate traffic the entire time. Is this the Netherlands? Denmark? Some future bike utopia? Nope – you can do that today between Pittsburgh and Washington, DC. Might we do the same in California?
This Tuesday, the County of Marin released the Alto Tunnel Investigation and Cost Estimate Update, signaling the completion of several years of information-gathering on the long-shuttered tunnel. “MCBC is delighted that this day has finally come,” said Executive Director Jim Elias. “With detailed cost estimates in hand, we now know what it will take to close the last significant gap in the North-South Greenway.”
Reopening the Alto Tunnel remains critical to the completion of Marin’s North-South Greenway.
Join MCBC and the Mill Valley Historical Society for a fun and informative 8-mile history ride through Mill Valley! Choose from 3 different departure times.
November 2024 Election – Hear from Mill Valley City Council Candidates on bicycling issues.
Few projects now underway in California capture the imagination like the Great Redwood Trail. A planned 320-mile multi use pathway connecting San Francisco Bay to Humboldt Bay, the GRT is steadily becoming closer to reality.
November 2022 Election – Hear from Corte Madera Town Council Candidates on bicycling issues.
Imagine yourself riding north from Larkspur Ferry, through Cal Park Hill Tunnel toward San Rafael. Three hundred and twenty miles of bike paths and trails later, you find yourself in Eureka looking out over Humboldt Bay. Sounds like a dream, right? Well, that dream took a step closer to reality this October when Governor Newsom signed the Great Redwood Trail Act (SB 69) by State Senator Mike McGuire.
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