Logo

Diablo Trail Run

Clayton, United States • 7 Sep 2025

Diablo Trail Run takes place at Mount Diablo State Park, Mitchell Canyon Trailhead in Clayton, California. The event offers 4-mile, 10-mile, half marathon, marathon, 50K, and a Kids’ Run (50-yard dash). The 4-mile course is relatively flat, while the longer distances traverse mountainous, scenic terrain with sweeping Bay Area views.

Courses are clearly marked with polka-dot flagging and color-coded ribbons to guide turns. Terrain is mostly dirt roads and single-track trails, with elevation gains from about 400 feet to around 8,000 feet. Aid stations are fully stocked, and the cupless policy reduces waste.

Finisher shirts, medals, and a 50K coaster accompany awards and race credits for top finishers. Visit the organization's website for the most recent information.

United States California Clayton

Race information

Website
50 km
2438 m+
50k
10 Mi
4 Mi
Half Marathon
Marathon
Kid's Run (6yo & Younger, 50yd Dash) - Free!
Visit the organization's website for the most recent information.
Trail runs nearby

Garin Park XC Challenge

Hayward - 20 mi from Clayton

Garin Park XC Challenge 2025, held at Garin/Dry Creek Pioneer Regional Parks on Garin Avenue in Hayward, California, is a 5K cross-country race described as a tough yet scenic run along the Garin Park ridge. Now in its 21st year, the event is part of the Pacific Association of USA Track & Field Cros..

Berkeley Trail Adventure

Berkeley - 19 mi from Clayton

The Berkeley Trail Adventure is a scenic trail running event held in Berkeley, California, within Tilden Regional Park and Wildcat Canyon. It offers four race distances: 10K, half marathon, 35K, and 50K, featuring challenging terrain with technical dirt trails, fire roads, and some asphalt sections...

Rocky Ridge Trail Half Marathon

San Ramon - 12 mi from Clayton

The Rocky Ridge Trail Half Marathon is a challenging trail race held in the scenic Las Trampas Wilderness near San Ramon, California. Scheduled for September 20, 2025, the event features a demanding half marathon known for its tough hills and breathtaking views, offering runners a unique wilderness..

Dick Collins Firetrails

Castro Valley - 18 mi from Clayton

The Dick Collins Firetrails will take place in Castro Valley from Saturday 27 September 2025 to Sunday 28 September 2025. You can run between 42 and 100 kilometers.

UTMB Index

Reservoir Dogs Trail Run - Orinda, CA

Orinda - 14 mi from Clayton

Reservoir Dogs Trail Run in Orinda, CA offers 10K, Half Marathon, and 35K distances with start and finish in the San Pablo Reservoir Recreation Area. The event is notable as the first trail race to completely circumnavigate Briones Reservoir on EBMUD trails, delivering rolling open fire roads, tree-..

Diablo Summit Stomp

Walnut Creek - 7 mi from Clayton

Diablo Summit Stomp is a Brazen Racing trail event in Walnut Creek, California, starting at Castle Rock Park and venturing into Mount Diablo State Park toward the summit. Distances offered are 30K, half marathon, 10K, and 5K, all run on dirt trails with hills and the possibility of mud or creek cros..