Improving trail access for mountain biking since 1994

Over 1300 members have stepped up to help SDMBA make mountain biking better for everyone in San Diego County. SDMBA advocacy volunteers provide a unified voice for trail users in public land use policies favoring sustainable outdoor recreational opportunities. Liaisons, trail builders, and other advocates seek out and build harmonious unified alliances and partnerships with businesses, land managers, and communities. Specialized volunteer-run programs support this mission and further inspire youth to explore and learn about nature and become its future stewards.

Events Feed


San Marcos Trails Day

Join us for San Marcos Trails Day. There will be guided hikes  and equestrian ride with this FREE event and an expo area at Lakeview Park. 

SDMBA w...


Advocacy Committee Meeting

Monthly SDMBA Advocacy Committee meetings are generally on the 1st Monday of the month, 6:00 pm to 8:00 pm.

The Advocacy Committee is focused on presenting opportuni...


Board Meeting

The monthly Board Meetings are held on the 3rd Wednesday of every month at Mission Trails Regional Park, Visitor’s Center Library.  
Board meetings are open to th...

News Feed


May 23, 2019

Vote for SDMBA! Voting closes on June 7! Jenson USA is donating the proceeds from their 2019 #keeppedaling hat to the trail association with the m...

...and the winner is...

May 6, 2019

The winner of the Five for the Trail - One for the Grail campaign is Kerry Quakenbush of Los Angeles. Thanks to everyone who donated. $16,350 raised ...

Calavera Trails Advocacy Meeting and Other Efforts

April 17, 2019

Concerned about recent increased access issues at Calavera?