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.