Diablo Trails Challenge

The Diablo Trails Challenge is a running event taking place on April 5, 2025, at Mount Diablo, featuring multiple race distances: 50K, half marathon, 10K, and 5K. Organized by Brazen Racing, this event caters to runners of all experience levels, from beginners to seasoned ultra-runners. A portion of the entry fees supports Save Mount Diablo, an organization dedicated to preserving open spaces around the mountain.

Participants can enjoy the scenic trails while contributing to a worthy cause, making it a celebration of both fitness and environmental conservation. Visit the organization's website for the most recent information.