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Diablo Trail Run

Clayton, United States • 7 Sep 2025

The Diablo Trail Run, held at Diablo State Park in Clayton, California, offers a variety of distances including 4 miles, 10 miles, half marathon, marathon, 50K, and a free kids' run for children 6 years and younger. The event features scenic courses with spectacular views of the San Francisco Bay Area and surrounding valleys. The 4-mile course is relatively flat and fast, while longer distances are mountainous and challenging, with elevation gains up to 8,000 feet for the 50K.

The trails consist mainly of dirt roads and single-track paths. Aid stations are stocked every 3-5 miles, and the race promotes environmental responsibility by being cupless. All finishers receive custom medals, and top competitors earn awards and race credits. Visit the organization's website for the most recent information.

United States California Clayton

Race information

Website
50 km
8000 m+
50k
26 mi
6760 m+
Marathon
13 mi
3420 m+
Half Marathon
10 mi
2420 m+
10 Mi
4 mi
400 m+
4 Mi
Kid's Run (6yo & Younger, 50yd Dash) - Free!
Visit the organization's website for the most recent information.
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