A post-doctoral level mountain loop through the Salmon River Mountains of Idaho
Other trail races within 189 miles
The IMTUF 100 is a self-described 'post-doctoral level' mountain ultra that loops through the Salmon River Mountains of central Idaho. Starting and finishing at Jug Mountain Ranch just south of McCall, runners navigate over 22,000 feet of elevation gain across brutal technical terrain — steep granite talus, narrow ridgelines, and deep river canyon descents. The course crosses eight high passes through the Payette National Forest and Idaho Department of Lands, with aid stations spaced widely through genuinely remote backcountry. The peak elk rut typically falls on race weekend, so bugling bulls are a regular trailside companion. Since 2012 it has served as both a Hardrock 100 and Western States 100 qualifier — a reputation earned honestly: 2023 top finishers independently called it harder and more technical than Hardrock.
Experienced ultrarunners
McCall, ID, United StatesSeptember 19, 2026
IMTUF 100 Mile is a loop trail race in McCall, ID, United States, held on September 19, 2026. The course covers 100 miles, climbs 22,000 ft, and has a 36h cutoff.
Challenging terrain with rocks, roots, and steep grades
| Location | Mile | Elevation | Cutoff | Crew | Pacers | Drop bags |
|---|---|---|---|---|---|---|
Jug Mountain Ranch Start | 0.0 | 4,954 ft | — | Crew | Drop Bags | |
Louie Lake Dam Aid Station | 10.4 | 7,005 ft | — | |||
Lake Fork TH Aid #1 Aid Station | 19.7 | 5,430 ft | 8h2:00 PM | Crew | Drop Bags | |
South Crestline TH Aid Aid Station | 29.5 | 5,574 ft | 10h30m4:30 PM | Crew | Drop Bags | |
45th Parallel Aid Aid Station | 36.7 | 6,919 ft | — | |||
North Crestline TH Aid Aid Station | 47.0 | 7,201 ft | 16h45m10:45 PM | Drop Bags | ||
Upper Payette Lake Aid Aid Station | 55.7 | 5,584 ft | 19h15m1:15 AM +1 | Crew | Pacers | Drop Bags |
Duck Lake TH Aid Aid Station | 66.1 | 6,552 ft | 23h5:00 AM +1 | |||
Snowslide TH Aid Aid Station | 70.8 | 5,915 ft | 24h30m6:30 AM +1 | Crew | Pacers | Drop Bags |
Lake Fork TH Aid #2 Aid Station | 82.4 | 5,430 ft | 28h30m10:30 AM +1 | Crew | Pacers | Drop Bags |
Boulder Lakes TH Aid Aid Station | 93.4 | 6,234 ft | 33h45m3:45 PM +1 | Crew | Pacers | Drop Bags |
Jug Mountain Ranch Finish | 99.8 | 4,954 ft | 36h6:00 PM +1 | Crew | Drop Bags |
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.
September weather in the Salmon River Mountains can shift rapidly — clear mornings can give way to afternoon thunderstorms and cold nights above treeline
Nighttime and high-elevation temperatures can drop sharply; mandatory hooded jacket, buff/beanie, and quality headlamp may be required for runners departing South Crestline after 1:30 PM
Exposed ridgeline sections (Crestline Trail, high passes) carry afternoon lightning risk common in Idaho mountain summers
No required gear specified
No recommended gear specified
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