1 ultra event in Jefferson County, Colorado

From big races to Saturday morning group runs—find ultra events and connect with the local endurance sports community.

• North Fork 50 Mile/50K [northfork50.com] [Register at ultrasignup.com] - Facebook - Instagram
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  Sat, May 30, 2026

  50k 50 Miles Ultra

  18050 South Buffalo Creek Road, Jefferson County, Colorado, 80425, United States
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