Diablo Summit Stomp

The Diablo Summit Stomp is a trail running event held in Walnut Creek, California, featuring distances of 30K, half marathon, 10K, and 5K. The courses traverse dirt trails starting from Castle Rock Park and extend into Mount Diablo State Park, with the 30K reaching all the way to the summit. The event welcomes both first-time trail runners and experienced athletes, including walkers and hikers.

Runners experience varied terrain with some hills, mud, and creek crossings depending on weather conditions. The race offers well-marked courses, aid stations with refreshments, and age group awards. It is scheduled for October 18, 2025, and emphasizes a friendly, challenging atmosphere amidst scenic natural surroundings. Visit the organization's website for the most recent information.