The Rut Mountain Runs 21k is the 21.0km trail race at The Rut Mountain Runs 2026 (Big Sky Resort base area, United States). The race starts on September 11, 2026 at 10:00 AM. It starts and finishes in Big Sky Resort base area. The time limit is 7 h.
Hold a steady pace and save energy for every section.
The course climbs 1220m+. With 58m/km of climbing, this is a true mountain course with sustained climbs and descents. By gradient, 44% of the distance is uphill, 47% downhill and 9% flat. The longest climb runs 5.5km at an average 11.8% grade (650m of vertical). The longest descent runs 5.5km at an average 11.9% grade (651m of vertical). The steepest climb averages 21.6% over 0.5km. The steepest descent drops at 23.8% over 0.6km. Flat-equivalent effort: 31.8 FlatKM.
The course also passes close to Andesite Mountain (2661m).
Trekking poles are worth taking: about 3.6km of the course favours them.
Quad damage risk is moderate (index 20 of 100), with 63% of the load in the first half: 1 descent deserves a plan and a couple of downhill sessions before race day.
On race day, start temperatures have historically ranged from 6°C to 18°C, with around 12°C at the highest point; the chance of precipitation is about 30%. Heavy rain of 10.0mm or more falls on about 3% of days around this date.
682 finishers completed the 2026 edition. Men's winner: Gavin Galyardt (United States) in 2:11:27. Women's winner: Ava Ashby (United States) in 2:26:35.
This page has the full results and splits, a pacing and nutrition planner, a gradient matrix, an interactive elevation profile and historical weather for The Rut Mountain Runs 21k.
Other distances of The Rut Mountain Runs 2026The Rut Mountain Runs 50k (50.0km)·The Rut Mountain Runs 28k (28.0km)·The Rut Mountain Runs 11k (11.0km)·The Rut Mountain Runs Lone Peak Vertical Kilometer (4.6km)
Other editions of The Rut Mountain Runs 21k2027·2025
Official websiteruntherut.com