Diablo Trail Run

The Diablo Trail Run, held at Diablo State Park in Clayton, California, offers a variety of trail running events including 4-mile, 10-mile, half marathon, marathon, 50K, and a free kids' 50-yard dash for children six and under. The courses feature scenic mountainous terrain with spectacular views of the San Francisco Bay Area. The 4-mile route is relatively flat and fast, while longer distances include significant elevation gains up to 8,000 feet for the 50K.

The trails consist mainly of dirt roads and single-track paths. Aid stations stocked with refreshments are spaced every 3-5 miles. The event emphasizes environmental care by being cupless to reduce waste. Visit the organization's website for the most recent information.