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
Challenging terrain with rocks, roots, and steep grades
| Location | Mile | Elevation |
|---|---|---|
Jug Mountain Ranch Start | 0.0 | 4,954 ft |
Louie Lake Dam Aid Station | 10.4 | 7,005 ft |
Lake Fork TH Aid #1 Aid Station | 19.7 | 5,430 ft |
South Crestline TH Aid Aid Station | 29.5 | 5,574 ft |
45th Parallel Aid Aid Station | 36.7 | 6,919 ft |
North Crestline TH Aid Aid Station | 47.0 | 7,201 ft |
Upper Payette Lake Aid Aid Station | 55.7 | 5,584 ft |
Duck Lake TH Aid Aid Station | 66.1 | 6,552 ft |
Snowslide TH Aid Aid Station | 70.8 | 5,915 ft |
Lake Fork TH Aid #2 Aid Station | 82.4 | 5,430 ft |
Boulder Lakes TH Aid Aid Station | 93.4 | 6,234 ft |
Jug Mountain Ranch Finish | 99.8 | 4,954 ft |
Sign in to see cutoffs, crew access, drop bags, and services for every aid station.
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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