IMTUF 100 - Idaho Mountain Trail Ultra Festival

The 15th Annual IMTUF 100 Races return to the rugged beauty of Jug Mountain Ranch near McCall on September 19-20, 2026. Registration opens January 2nd, offering runners a chance to challenge themselves in some of Idaho’s most demanding terrain.
Participants will start and finish at Jug Mountain Ranch, where they’ll embark on courses that have tested the mettle of ultrarunners since the race's inception. The grueling 100-mile event kicks off early Saturday morning, while the more manageable but still challenging 20-mile option starts Sunday at 9AM.
IMTUF is renowned for its serious nature and commitment level required from runners. This isn’t a casual adventure; it’s an undertaking that demands preparation and mental fortitude. The race courses are known to stretch far beyond immediate help, emphasizing the importance of self-reliance and thorough planning.
For those aiming high in their ultrarunning careers, IMTUF offers valuable qualification points for both Hardrock 100 and Western States 100 races. However, runners should approach this event with a singular focus, as it requires more than just physical endurance—it demands strategic preparation and an understanding of the mountain’s unpredictable nature.
Registration comes with important considerations: refunds are limited to 50% until July 1st, after which no changes can be made. This policy underscores the race's commitment level and reflects its reputation for pushing runners beyond their limits in one of America’s most stunning yet challenging landscapes.
IMTUF is not just a race; it’s an experience that rewards those who respect its demands with unparalleled views and a sense of accomplishment few events can match.
Runners are advised to read the waiver thoroughly before signing up, as this event requires more than just physical readiness—it calls for mental toughness and preparedness. The IMTUF is not for everyone; it’s designed for serious ultrarunners who embrace adventure and uncertainty in pursuit of their goals.