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Diablo Summit Stomp

Walnut Creek, United States • 18 Oct 2025

The Diablo Summit Stomp is a Brazen Racing trail race in Walnut Creek, California, starting at Castle Rock Park and venturing into Mount Diablo State Park toward the summit. Runners can choose from four dirt-trail distances: 5K, 10K, Half Marathon, and 30K. The course features hills, potential mud and creek crossings, and is friendly to walkers as well as runners, making it welcoming for first-time trail participants and veterans alike. All courses are clearly marked with colored ribbons, signs, and flour; GPX files are available for navigation. A quirky mid-race option lets 30K runners switch to the half marathon if desired. Visit the organization's website for the most recent information.

United States California Walnut Creek

Race information

Website Registration
30 km
30k
21 km
Half Marathon
10 km
10k
5 km
Visit the organization's website for the most recent information.
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