Mt. Diablo Challenge
San Francisco, California San Francisco, CaliforniaThe 42nd Mt. Diablo Challenge Presented by the Valley Spokesmen Bicycle Club We are pleased to announce that the 42nd Mt. Diablo Challenge Ride will be held on Sunday, October 5, 2025 The 11.2-mile, individually timed ride climbs 3,249 feet to the summit of Mt. Diablo starting up South Gate Road. Mt. Diablo is one …