Diablo Trail Run
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Diablo Trail Run - Clayton, CA
The Diablo Trail Run takes place on Sunday September 6, 2026, at Mount Diablo State Park (Mitchell Canyon Trailhead) in Clayton, CA. The event offers multiple trail distances and a free kids dash for young children.
- 4 Mi
- 10 Mi
- Half Marathon
- Marathon
- 50K
- Kid's Run (6yo & younger, 50 yd dash) - Free
The 4 mile course runs within Mitchell Canyon and is described as relatively flat and fast. Longer distances use mountainous trail and dirt-road sections with substantial elevation gain. Reported elevation gain values include 400' for 4 mi, 2,420' for 10 mi, 3,420' for the half marathon, 6,760' for the marathon, and 8,000' for the 50K. Surface types vary by distance and include single track, dirt road, and small amounts of asphalt.
Aid stations are placed every 3 to 5 miles and provide fresh fruit, salty snacks, assorted candy, water, and Skratch electrolyte drink. Runners are advised to carry at least 20 oz of water between stations. The race operates a cupless policy; participants should bring their own fluid container. Some Hydrapak SpeedCups will be available for purchase at check-in. Course marking uses color flagging and polka-dot flags to indicate turns; blue ribbons mark wrong directions. Headphone use is restricted to dirt road sections only. Parking at the park has a $6 fee per vehicle. Shirts are provided to pre-registered runners and are guaranteed if registered at least 10 business days before the event. Visit the organization's website for the most recent information.
