Diablo Summit Stomp

Now in its 11th edition, the Diablo Summit Stomp draws a dedicated field of around 104 runners, with 17% returning year after year. Runners come from about 5 states to tackle the half-marathon (and accompanying 30K, 10K, and 5K) on the slopes of Mount Diablo in Walnut Creek, California. This is a low-key event that prioritizes community over crowds—perfect for those seeking a no-frills, local race with a loyal following.

The course, described as a loop on pavement, takes runners through the rolling terrain of the Diablo foothills. Though official elevation data is absent, the name suggests a challenging, scenic route. The small field means plenty of personal space, and the finish area offers a modest post-race gathering. For runners looking to combine a race with a visit to the East Bay, this under-the-radar event delivers a genuine, unfussy experience.