Diablo has a bunch of fireroads and a few sections of legal singletrack. It also has a bunch of very good, pretty technical singletrack that is theoretically off-limits to bikes. That singletrack ranges from very flowy to steep, rocky and ledgy.



If it's been raining access from Danville, Alamo or Walnut Creek is horrible since the lower reaches are adobe clay and unridable, unless you consider pushing a bike that now has 50 lbs of clay sticking to it riding.

Wet Winter acccess can be found in Clayton by climbing Mitchell Canyon. The Winter route if the mountain is wet is Mitchell Canyon-Deer Flat-Juniper-road to Devil's Elbow-North Peak Trail (legal singletrack)-Prospector's Gap-Murchio Gap-Deer Flat-back down Mitchell.

A map is available at most local shops.