All the gnarliest terrain of the 50K in a shorter, punchier mountain challenge
Other trail races within 190 miles
A compact but ferocious mountain course that packs maximum vertical and technical terrain into 28 kilometers. It traverses the same exposed and rugged ridgelines as the 50K — including the technical ascent and traverse of Headwaters Ridge and the ascent and descent of Lone Peak — in a shorter, punchier format. The shorter distance belies its severity: this is a demanding full mountain running experience with rockfall hazard and serious exposure. Mandatory gear required.
Experienced ultrarunners
Big Sky, MT, United StatesSeptember 12, 2026
| Location | Mile | Elevation |
|---|---|---|
Start Start | 0.0 | 7,536 ft |
Headwaters Aid Station Aid Station | 3.9 | 8,996 ft |
Swiftcurrent Aid Station Aid Station | 9.3 | 9,167 ft |
Summit Aid Station (Water Only) Aid Station | 10.3 | 11,138 ft |
Moosetracks Aid Station Aid Station | 14.4 | 8,228 ft |
Finish Finish | 17.4 | 7,523 ft |
Sign in to see cutoffs, crew access, drop bags, and services for every aid station.
Ascends to the summit area of Lone Peak at 11,166 ft, with significant time above 9,000 ft.
Course traverses exposed alpine ridgelines; afternoon thunderstorms are common in September.
Mandatory gear (waterproof jacket, space blanket, 16oz water) required due to rapidly changing mountain conditions.
No required gear specified
No recommended gear specified
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