A savage Montana mountain loop over the summit of Lone Peak — not your average 50K
Other trail races within 190 miles
One of North America's most technically demanding 50Ks, set entirely within Big Sky Resort's Lone Peak massif in Montana. The course loops around and over Lone Peak, including the ascent and traverse of Headwaters Ridge and the full ascent and descent of Lone Peak's summit at 11,166 ft. Critical sections are extremely steep and technical with exposed terrain and rockfall hazard — organizers note that a fall in these sections could result in injury or death. The 6 AM pre-dawn start, mandatory gear, and strict cutoffs reflect the mountain-serious character of the race.
Experienced ultrarunners
Big Sky, MT, United StatesSeptember 13, 2026
The Rut Mountain Runs 50K is a loop trail race in Big Sky, MT, United States, held on September 13, 2026. The course covers 31.1 miles, climbs 10,500 ft, and has a 13h cutoff.
| Location | Mile | Elevation | Cutoff | Drop bags |
|---|---|---|---|---|
Start Start | 0.0 | 7,543 ft | — | |
Moonlight #1 Aid Station Aid Station | 6.2 | 8,002 ft | — | |
Moonlight #2 Aid Station Aid Station | 10.7 | 8,031 ft | 3h40m9:40 AM | |
Swiftcurrent Aid Station Aid Station | 18.4 | 9,157 ft | 7h15m1:15 PM | Drop Bags |
Summit Aid Station Aid Station | 19.4 | 11,138 ft | 8h30m2:30 PM | |
Shedhorn Aid Station (Hydration Only) Aid Station | 22.0 | 9,045 ft | 10h4:00 PM | |
Andesite Aid Station Aid Station | 25.6 | 8,652 ft | 11h15m5:15 PM | |
Finish Finish | 31.1 | 7,543 ft | 13h7:00 PM |
Aid station details for this race are still being filled in. Cutoffs and access rules come from the race’s own published information and can change — check the official race details before planning around them.
Sign in for race-day weather at every station, points of interest, segment-by-segment analysis, pacing, and to save this race to your calendar.
Significant time above 9,000 ft with summit finish area at 11,166 ft; start area at 7,534 ft.
Traverses exposed alpine ridgelines; afternoon thunderstorms common in September. Early wave starts aim to clear the most exposed terrain before afternoon.
6 AM pre-dawn start in September at altitude; temperatures can be near or below freezing. Mandatory waterproof jacket and space blanket required.
Mountain weather can change rapidly. Race organizers have the right to reroute or stop the race if conditions become dangerous.
No required gear specified
No recommended gear specified
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