Rocky Mountain Milestone Challenge

Granby, United States • 19 Aug 2026

Rocky Mountain Milestone Challenge : Granby, CO

The Rocky Mountain Milestone Challenge is a timed endurance event based at Snow Mountain Ranch in Granby, Colorado. Athletes run repeated laps of a roughly 10 mile trail loop and have 60 hours to complete as many laps as they choose. The loop includes dirt roads, OHV trails, mountain biking trails and equestrian trails with varying terrain such as single and double track, hard packed dirt and rocky sections. The planned elevation gain for the loop is about 1,200 ft and the final route is still being confirmed.

The event is offered as an all inclusive experience with on site lodging options, meals, fuel and hydration at aid stations, recovery services and event support. Accommodation choices include shared rooms, private rooms, yurts and campsites with different availability. Support features include a coached training program, recovery amenities and an online community for participants. Milestone distances marked during the event include standard race lengths up to and beyond 100 miles; runners mark laps on a progress board and may rest between laps using the provided facilities.

The event is located at 1101 County Road 53, Granby, CO. There is onsite parking and participants are expected to arrange their own travel to the ranch. More event details will be published closer to the date. Visit the organization's website for the most recent information.

Race information

100 mi
100 Miles Milestone
100 km
100k Milestone
50 mi
50 Miles Milestone
50 km
50k Milestone
26 mi
26.2 Milestone
13 mi
13.1 Milestone
10 mi
10-Mile Trail Loop
Visit the organization's website for the most recent information.
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