California · 10K · 30K · 5K
Diablo Summit Stomp
Diablo Summit Stomp is a 10K, 30K, 5K, half marathon and Remote Runner event held in Walnut Creek, California. It was last held on October 17, 2026 and is usually run in October; the next date hasn't been announced yet.
- Usually held
- October
- Location
- Walnut Creek, CA
Race details
- Last held
- October 17, 2026
- Usually held in
- October
- Location
- Walnut Creek, California
- Distances
- 10K, 30K, 5K, Half Marathon, Remote Runner
- Course
- 4254 ft gain
- Registration
- raceroster.com
Registration, course & weather
- Registration status
- Registration status as last checked September 28, 2026: open
- Start time
- 7:45 AM PDT
- Course profile — 10K
- Out-and-back course; Trail surface
- Course profile — 5K
- Out-and-back course; Trail surface
- Course profile — 30K
- Lollipop course (a loop with an out-and-back section); Trail surface; 4254 ft gain (official course data)
- Course profile — Half Marathon
- Lollipop course (a loop with an out-and-back section); Trail surface; 2492 ft gain (official course data)
- Course profile — Remote Runner
- Loop course; Road surface
- Typical race-day weather
- about 55°F at the start, 90% humidity, 3 mph wind (based on the 2025 race day, measured near the city center rather than the exact start line; Open-Meteo, checked September 28, 2026)
About the Diablo Summit Stomp
The Diablo Summit Stomp is an annual Brazen Racing trail event starting and finishing at Castle Rock Recreation Area in Walnut Creek, CA, sending 30K and Half Marathon runners up dirt fire roads to the Mount Diablo summit (elevation ~3,849 ft) with shorter 10K, 5K, and a remote/virtual option for those who can't attend in person.
More half marathons in California
Coming up next, by confirmed date.
-
Dia De Los Muertos Half Marathon & 5K Run/Walk (Bakersfield)Bakersfield, CAHalf Marathon5K2 Mile Speed Walk
More races in Walnut Creek
More upcoming races in California
Keep exploring
- All races in California
- 5Ks in California 459 upcoming races
- 10Ks in California 316 upcoming races
- Half Marathons in California 197 upcoming races
- Marathons in California 41 upcoming races
- 5Ks in the United States 6,420 upcoming races
- 10Ks in the United States 2,756 upcoming races
- Half Marathons in the United States 1,828 upcoming races
- Fall Half Marathons
- October Half Marathons
- October races in California
- Half Marathons in Arizona 54 upcoming races
- Half Marathons in Nevada 35 upcoming races
- Half Marathons in Oregon 29 upcoming races
Guides from the RaceRove blog
- 8 min read How to Choose the Best Half Marathon for a PR, Racecation or 50-State Challenge The best half marathon depends on what you want from it. How to choose a course for a personal record, a race worth travelling for, or an efficient stop on a 50-state challenge.
- 7 min read How to Find a 5K, 10K, Half Marathon or Marathon Near You A practical way to find running races near you: pick a distance, decide how far you'll travel, read the listing properly and confirm the details before you register.
- 9 min read How to Run a Race in All 50 States How to plan a 50-state running challenge: set your own rules, group states into trips, build a calendar around the seasons, budget for it and keep track of every finish.
- Blog All guides Planning advice for finding, choosing and travelling to races.
Diablo Summit Stomp: common questions
- When is the Diablo Summit Stomp?
- The next date hasn't been announced in the listing yet. The race is usually held in October. Check the organiser's website for the official date.
- Where is the Diablo Summit Stomp held?
- In Walnut Creek, California.
- What distances does the Diablo Summit Stomp offer?
- 10K, 30K, 5K, Half Marathon and Remote Runner.
- How do I register for the Diablo Summit Stomp?
- Registration is handled by the organiser at raceroster.com. Entry fees, caps and deadlines are set there.
- Is registration open for the Diablo Summit Stomp?
- Registration status as last checked September 28, 2026: open.
- What time does the Diablo Summit Stomp start?
- 7:45 AM PDT.
- What is race-day weather usually like at the Diablo Summit Stomp?
- about 55°F at the start, 90% humidity, 3 mph wind (based on the 2025 race day, measured near the city center rather than the exact start line; Open-Meteo, checked September 28, 2026).
Plan this race in RaceRove
Save it to your plan, compare it with other races, check typical race-day weather and track your 50-state progress in the interactive app.