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Built on bad decisions in Boulder, CO.

Quad Rock

2 Race EventsMarathon, 50 Mile

Gnar Runners

Bellvue, Colorado, United States

Course map for Quad Rock 25 Mile

Quad Rock 25 Mile

May 9, 2026

MarathonCrew

Course map for Quad Rock 50 Mile

Quad Rock 50 Mile

May 9, 2026

50 MileCrew