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Rabbit Valley Ultras

Mack, United States • 18 Oct 2025

Rabbit Valley Ultras is an exciting new ultra-running event set in the scenic Grand Valley area of Mack, Colorado. Participants can choose between two distances: a 50k and a 100k, with the course featuring two segments and a central aid station. The event emphasizes a natural, unpaved environment, and runners will enjoy professional chip timing and a supportive atmosphere. Each finisher will receive a unique buckle, and prizes will be awarded to the top three male and female runners in each race. Registration is limited to 125 runners, and the event is pending approval from the Bureau of Land Management. Visit the organization's website for the most recent information.

United States Colorado Mack

Race information

Website Registration
100 km
100k
50 km
50k
Visit the organization's website for the most recent information.
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