Idaho Mountain Trail Ultra Festival (IMTUF 100)
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Event overview
The IMTUF 100 - Idaho Mountain Trail Ultra Festival is scheduled for September 19-20, 2026 near McCall, Idaho. It is the 15th annual running of the event and uses the same courses as in prior years, with the start and finish located at Jug Mountain Ranch, just south of McCall. The organizer describes the race as mountain adventure running where participants can be many miles and many hours from help.
The event lists the following race distances:
- 100 Miler
- 20 Miler
For 2026, IMTUF will continue to be a Hardrock 100 qualifier. Previous editions have also served as a Western States 100 qualifier.
Registration and policies
Registration opens January 2, 2026 at 12:00 AM PT. The organizer posts a refund policy and a waiver; the waiver emphasizes that the race requires significant commitment and preparation.
The refund policy states that 50% of the entry fee will be refunded until July 1, 2026 at 11:59 PM, and that there will be no refunds after that date. The policy also states there will be no rollover or transfer of bibs. If the race must be cancelled due to fire, severe weather, or similar events, the organizer states there is no refund or rollover. The organizer notes that individuals facing personal financial hardship may contact them. Visit the organization's website for the most recent information.
