Races
IMTUF 100
Jug Mountain Ranch. Eight high passes in the Salmon River Mountains. Twenty-two thousand feet. Elk bugling at rut. Harder than it looks on the qualifier list.
100 mi+16,105 ft-16,134 ft36 hours4,928 ft to 8,272 fttech 6/10Checkpoints per race bookHardrock qualifierWestern States qualifierpost-graduate ultraSeptember
Distance100 mi
Gain+16,105 ft
Loss-16,134 ft
Altitude4,928 ft to 8,272 ft
Technicality6/10
Air30°F to 75°F
- Start4,957 ft
- High8,272 ft
- Low4,928 ft
- Finish4,928 ft
Field, 2025 · 14-year samplescraped
Starters208
Finish rate58%
Median30:56
Sub-247
Geometryderived
Steepest drop1,421 ft-12.7% over 2.1 mi
Night miles47 misunset near 18:00 local
Course records
Men11:58:32Behnam Kamrani
Women9:37:28Lieko Earle
The cruxThe Crestline with no crew access and hard cutoffs (near mile 65)
Course DNA
The Course
IMTUF 100 runs 100 mi through McCall, Idaho. +16,105 ft gain and -16,134 ft loss. Surfaces skew 95% trail / 5% dirt road. The Crestline with no crew access and hard cutoffs. High point near 8,272 ft. Low near 4,928 ft. September temps run 30°F to 75°F. The course rewards patience early and punishes rushed descents after mile 50.
The Work
Train for 16,105 feet of climbing across 100 mi. Back-to-back long runs on trail. Practice power-hiking grades above 15 percent. 36 hours total means limited margin: rehearse fueling every 45 to 60 minutes and downhill eccentric work weekly. Technicality 6/10. Build a block that simulates the crux near mile 65.
Kit
September in McCall, Idaho: plan for 30°F to 75°F. Mandatory shell if rain is in forecast. Headlamp with spare batteries if 36 hours pushes past dark. Poles help on sustained climbs above mile 25. Vest capacity for 2 liters minimum. Shoes matched to 95% trail: lugs for mud, rock plate if the course turns technical after mile 50.
Race Day
Hold effort through mile 25. The field often splits on the first big climb after mile 50. The Crestline with no crew access and hard cutoffs near mile 65 is where time is won or lost. Walk the steep pinches. Run the flats and gentle downhills. Crew at major aids: socks, calories, ice if hot. Transitions under 5 minutes when possible. Final third is 33 miles of fatigue management. Finish with reserve for the last descent.
Results
IMTUF 100 finish lines.
Official siteBack to racesPredict your timeTrain for this raceCheck readinessFoot care guide
Sources (3)
- Field stats (2025): https://ultrasignup.com/results_event.aspx?did=121354
- Course record (M): https://ultrasignup.com/results_event.aspx?did=31813
- Course record (F): https://ultrasignup.com/results_event.aspx?did=51877