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.