Diablo Trail Run
Always double-check with the organizer's website! This page may contain affiliate links.
Diablo Trail Run
The Diablo Trail Run takes place on Sunday May 23, 2027 at Mt. Diablo State Park, Mitchell Canyon Trailhead in Clayton, California. The event offers a range of measured trail and dirt-road courses with elevation profiles and surface breakdowns provided for each distance.
Available distances
- 4 Mi
- 10 Mi
- Half Marathon
- Marathon
- 50K
- Kid's Run (6 years & younger, 50 yd dash, free)
The 4 mile course is relatively flat and fast within Mitchell Canyon. The longer distances travel mountainous terrain on Mt. Diablo and use a mix of single-track, dirt road, and small amounts of asphalt. Distances were measured using a Rolatape surveyor's measuring wheel. Elevation gain by distance is provided for each course; the 50K lists the highest gain.
Aid stations are fully stocked every 3 to 5 miles with fresh fruit, salty snacks, assorted candy, water, and Skratch electrolyte drink. Runners are advised to carry at least 20 oz of water between aid stations. The event operates cupless aid stations; participants should bring their own fluid container. A Hydrapak SpeedCup is available for purchase at check-in.
Courses are marked with ribbon about every 200 yards and color coded by distance. Polka-dot flagging marks turns and blue ribbons mark wrong directions. Headphones are allowed on dirt roads only. No dogs are permitted on the course. Parking at the park is $6 per vehicle. Visit the organization's website for the most recent information.
