Mammoth Bar Trail Runs

The Mammoth Bar Trail Runs, hosted by Skybreaker Racing, is a trail running event held in Auburn, California, within the Auburn State Recreation Area. Scheduled for September 7, 2025, the event features three race distances: a half marathon, 10K, and 5K. The courses traverse the single-track and double-track trails of the Mammoth Bar OHV Area, known for its challenging steep climbs and descents, offering runners significant elevation gain ("vert") and scenic views of the American River Canyon.

This new event emphasizes a rugged, endurance-focused trail running experience, promising more vertical challenge per entry fee, and is organized under the Singletrack Running umbrella. Visit the organization's website for the most recent information.