Diablo Trail Run
Sunday, May 23, 2027, first start 7:50 AM, in Clayton (Diablo State Park (Mitchell Canyon Trailhead)). Distances: 2 miles, 4 miles, 10 miles, Half marathon, Marathon, 30.4 miles. Entry from $50 to $90; the 4 miles goes from $50 to $60 after May 17.
- Date
- Sunday, May 23, 2027
- Start time
- 7:50 AM (earliest wave)
- Location
- Diablo State Park (Mitchell Canyon Trailhead), Clayton, CA 94517
- Area
- East Bay, SF Bay Area
- Distances
- 2 miles4 miles10 milesHalf marathonMarathon30.4 miles
- Course
- Trail (dirt or single-track on at least part of the course)
- Price
- $50 to $90 plus the platform's processing fee
- Next price increase
- Monday, May 17, 2027: 4 miles $50 → $60
- Registration
- Open. Opened July 10, online signup closes Sunday, May 23, 2027
How to register
Registration is on RunSignup. Pick your distance, add any extras, and you'll get a confirmation email with your bib details. Sign up by May 17 to pay $50 instead of $60.
Course and race notes
Mount Diablo provides spectacular views of the San Francisco Bay Area and surrounding valleys. The 4 mile course is relatively flat and fast within Mitchell Canyon. The longer events are mountainous and very scenic. (Distances are accurately measured using a Rolatape® surveyor's measuring wheel.).
From the race's own listing. Check the race website for the course map and parking.
Source: RunSignup public race API, refreshed 2026-10-17. Details can change; the registration page is the final word.