Trail race guide
Diablo Summit Stomp: date, distances, elevation, and registration
Diablo Summit Stomp is a very hard trail race organized by Brazen Racing. It offers 5K, 10K, Half, 30K distances on Saturday, October 17, 2026.
- Date
- Saturday, October 17, 2026
- Location
- Castle Rock Recreation Area · Walnut Creek
- Distances
- 5K · 10K · Half · 30K
- Elevation gain
- 5K 558′ · 10K 1,249′ · Half/30K profiles linked by organizer View course profile / source
- Difficulty
- Very hard
- Registration
- Registration link below
- Official source
- Brazen Racing · Verified Sep 25, 2026
Questions about Diablo Summit Stomp
When and where is Diablo Summit Stomp?
Diablo Summit Stomp is scheduled for Saturday, October 17, 2026 at Castle Rock Recreation Area · Walnut Creek.
How do I register for Diablo Summit Stomp?
Use the official registration button on this page. Registration, payment, waivers, transfers, cancellations, and refunds are handled by Brazen Racing.
What distances are available?
Diablo Summit Stomp currently lists 5K, 10K, Half, 30K.
Can I invite a friend?
Yes—use the prefilled text or email invitation. It includes the race date, a suggested distance, and this guide.