Diablo Summit Stomp

OCT
17
2026
Trail races on Mount Diablo in Walnut Creek on October 17, 2026 offering 30K, half marathon, 10K and 5K on hilly trails with possible mud and creek crossings.
Sat 17 Oct 2026
30 kilometers Half Marathon 10 kilometers 5 kilometers

Always double-check with the organizer's website! This page may contain affiliate links.

Diablo Summit Stomp

Diablo Summit Stomp is a trail race held on October 17, 2026 in Walnut Creek, with courses on Mount Diablo. All courses are run on trails and include some hills.

Available distances:

  • 30K
  • Half Marathon
  • 10K
  • 5K

Depending on the weather, courses may include mud and creek crossings. Walkers and hikers are welcome in all distances. The organizer describes the event as friendly to first-time trail runners and experienced runners.

Event services and logistics mentioned by the organizer include bib pick-up, volunteer support, posted results, shirts and awards, and free photographs provided by volunteer photographers. Visit the organization's website for the most recent information.

30 km
30k
Half Marathon
Half Marathon
10 km
10k
5 km
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