Big Sky Marathon - Big Sky Marathon (Full)
Also in this race
These events were grouped as one card in discovery—pick another distance or date without going back.
External Event
Distance
26.2 mi
Pace
All paces
Terrain
Road
Difficulty
All Levels
About this run
The Big Sky Marathon is a high-altitude, downhill quad-burner that descends the Gravelly mountain range en route to the Blue-Ribbon Madison River. Racers log a total descent of nearly 4,900 feet at finish, and a net descent of over 3,800 feet. The inaugural year was 2015, and the BSM has quickly become our most popular test. Ninety-six percent (96%) of the trek is on unpaved, packed and loose gravel. WE HAVE IMPROVED THE COURSE FOR 2027, ELIMINATING THE OUT AND BACK LOOP TO/FROM HIGHWAY 287, AND THAT COURSE IS NOW PUBLIC ON GARMIN: https://connect.garmin.com/app/course/506792996 And, the half marathon option: https://connect.garmin.com/app/course/506794019 Or, supersize your day with 50K: https://connect.garmin.com/app/course/507504785 Prizes are awarded to the first and second place male and female finishers. Please stay for the after-party at Varney Bridge while Ultra 50K, full marathon, and half marathon registrants all commiserate together over local brews and bites.
Typical conditions
For events around July 2027 in Ennis, MT, United States: Typical summer / warmer season in this region — plan hydration and sun protection; verify any heat policies with the organizer.
How to prepare
Marathon training typically spans 12–16 weeks with a progressive long run and recovery weeks. Do not invent a course strategy here — check the official site for start waves, cutoffs, and gear rules.
Best marathons to run in 2026Getting there
This event is listed in Ennis, MT, United States. Confirm the exact start venue, parking, and transit options on the official registration page.
Registration is handled by the official event organizer
Know a local group? Host a community run in Ennis
Also in this race
- Jul 11, 2027 · 11:30 AM
- Jul 11, 2027 · 12:00 PM (this one)
- Jul 11, 2027 · 2:00 PM




