Diablo Trail Run

Diablo Trail Run

Diablo Trail Run is held at Diablo State Park, Mitchell Canyon Trailhead in Clayton, California. The course area offers views of the San Francisco Bay Area and surrounding valleys.

The event program includes multiple distances:

• 4 Miles
• 10 Miles
• 13.1 Miles (Half Marathon)
• 26.2 Miles (Marathon)
• 30.4 Miles (50K)
• 50 Yards (Kid's Run, 6 years and younger)
• 2 Miles (Coastal Testing)

The 4 mile course is described as relatively flat and fast within Mitchell Canyon. The longer courses run through mountainous terrain and are described as scenic. Distances are measured with a Rolatape® surveyor's measuring wheel.

Registration opens on 07/10/2026. Most trail events have registration that closes on 05/17/2027; some shorter or youth events have registration windows that close on the day of the event. Registration fees vary by distance, from no fee for the Kid's Run and Coastal Testing up to $90.00 for the 50K. Visit the organization's website for the most recent information.

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