Diablo Summit Stomp

OCT

17

2026

A trail running event on Mount Diablo in Walnut Creek. Runners can choose from a 30K, half marathon, 10K, or 5K distance on scenic trails. Walkers are welcome, and conditions may include mud and creek crossings.

Sat 17 Oct 2026

Walnut Creek, California

Website

30 kilometers Half Marathon 10 kilometers 5 kilometers

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Event Overview

The Diablo Summit Stomp is a trail race taking place in Walnut Creek on October 17, 2026. Participants can choose from one of four distances: a 30K, a Half Marathon, a 10K, or a 5K. The courses are entirely on trails and feature some hills. Depending on weather conditions, the courses may include mud and creek crossings.

Walkers and hikers are welcome to participate in all available distances. Volunteer photographers provide free photos from the event. Visit the organization's website for the most recent information.

30 km

30k

Half Marathon

10 km

10k

5 km