Diablo Trail Run

The Diablo Trail Run takes place in Clayton, in California's Contra Costa County, with distance options suited to every level of runner. You can pick the fast, relatively flat 4-mile loop through Mitchell Canyon, or take on one of the longer, more mountainous routes — 10 miles, a half marathon, a full marathon, or 30 miles — that climb the slopes of Mount Diablo and reward the effort with sweeping views across the San Francisco Bay. Whichever distance you sign up for, expect a well-organized event on trail that's become a favorite among Bay Area runners.