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Built on bad decisions in Boulder, CO.

Mammoth Bar Trail Runs

3 Race EventsHalf Marathon, 5K, 10K

Skybreaker Racing

Auburn, California, United States

Course map for Mammoth Bar 10K

Mammoth Bar 10K

Sep 7, 2025

10K

Mammoth Bar 5K

Sep 7, 2025

5K

Course map for Mammoth Bar Half Marathon

Mammoth Bar Half Marathon

Sep 7, 2025

Half Marathon