⚠️ 2027 edition: provisional information
The date is estimated from the 2026 edition (September 6, 2026), on the same day of the week. Courses, start times, fees and description are carried over from the previous edition: check them on the official website. This page will be updated as soon as the organizer publishes them.
Available distances
About
The Mammoth Bar Trail Runs take place in the Mammoth Bar OHV Area, within the Auburn State Recreation Area in California, offering a 10K (6.2 miles) and a half marathon (13.1 miles) for trail runners. The course mixes singletrack and doubletrack trail with steep climbs and descents, opening up views over the American River Canyon along the way. It's a new offering from Skybreaker Racing under the Singletrack Running brand, adding another well-organized option to Northern California's busy trail-running calendar.
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Races nearby
Other upcoming races around Auburn.
No Hands Trail Run
Jan 9, 2027 · Auburn, CA · 0 mi away
5 mi · 13.1 mi · 21.7 mi · 31.1 mi
FOURmidable
Feb 17, 2027 · Auburn, CA · 0 mi away
31.1 mi · 21.7 mi · 13.1 mi · 8.1 mi
The Quest! Adventure Run
Mar 13, 2027 · Auburn, CA · 0 mi away
6 mi · 12 mi
Knickerbocker Canyon Trail Run
Mar 27, 2027 · Auburn, CA · 0 mi away
21.7 mi · 13.1 mi · 6.2 mi · 3.1 mi
Wild Flowers 10k
Apr 17, 2027 · Auburn, CA · 0 mi away
6.2 mi
Way Too Cool 50k
Mar 6, 2027 · Cool, CA · 3 mi away
32 mi · 10.8 mi