Registration is Now Open for the 2019 Diablo Trails Challenge!

5K, 10K, Half Marathon, & 50K Run

Saturday, April 13, 2019

Diablo Trails Challenge has a run for everyone, from those hitting the trail for the first time to experienced ultra-runners, with a 5K, 10K, Half Marathon, and 50K. 

Hosted by Brazen Racing, this fundraising run supports Save Mount Diablo and showcases the natural beauty of Diablo’s wild lands. Join us and help Save Mount Diablo to preserve, defend, and restore more land for you, wildlife, and future generations to enjoy. Races will begin and end at Castle Rock Recreation Area, Walnut Creek. All races will be professionally timed. All runners receive medals after the race.

Learn more about the Diablo Trails Challenge on our website, where you can browse testimonials or view results and photo galleries from past years. Visit Brazen Racing to see information on courses and elevation.

Register Now: 

Click here to register


See you on April 13!

Join us to save the remaining natural lands of Mount Diablo!

Make a Donation