Diablo Trails Challenge
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Diablo Trails Challenge, Walnut Creek CA
Diablo Trails Challenge is a trail running event scheduled for April 4, 2026 at 1700 Castle Rock Road, Walnut Creek, California. The event is organized by Brazen Racing and directs a portion of entry fees to Save Mount Diablo to support open space and trail preservation.
The event offers multiple course options:
- 50K
- Half Marathon
- 10K
- 5K
The half marathon is part of the Brazen Ultra Half Series and the course descriptions note significant ascents and descents and a variety of trail terrain. The event program includes options for remote runners and a paid BBQ lunch ticket. Registration uses tiered pricing with different rates in advance and closer to the event.
Race information on the organizer site covers course maps, bib pick up, start information, shirts and awards, directions, results and photos. Volunteer opportunities are listed for those who wish to support operations and aid stations. The event materials emphasize the connection to Save Mount Diablo and the role of entry fees in helping preserve trails and nearby open space. Visit the organization's website for the most recent information.
