Overview
The IMTUF 100M isn’t just another race, it’s a full-body mountain experience. Starting and finishing at Jug Mountain Ranch outside of McCall, Idaho, this post-doctoral level ultra is where runners come to test the limits of their grit and skill. The course winds deep into the Salmon River Mountains, where steep ascents, technical descents, and relentless climbs stack up into a race that finishers compare to — or tougher than — the most legendary 100 milers in the world.
This is a race where you’ll hear elk bugling in the high country, see rugged peaks split the horizon, and know that you’re racing on a course with soul. For 14 years, IMTUF has earned its reputation as one of the hardest and most beautiful ultras in North America. The challenge is steep, but the reward is unforgettable.
Saturday, September 13, 2025
Registration
Opens
Jan 1, 2025, 12:00 AM
Closes
Sep 1, 2025, 11:59 PM
Registration Fee
$300
Hard Rock Qualifier
Western States Qualifier
Official race details:
Course
Distance:
100
M
Course type:
Unknown
Elevation gain:
▲
17,500ft
Elevation loss:
▼
17,500ft
Max altitude:
8102ft
Start time:
Sep 13, 2025
6:00 AM
Cutoff time:
36HR overall, finish cutoff at September 21, 2025 6:00PM
Course Description
The IMTUF 100M Supercourse is a single-loop adventure through the Salmon River Mountains. Expect steep climbs that will test your lungs, long descents that will pound your quads, and rugged, technical footing that demands constant attention. The route traverses alpine ridges with expansive views, dives into deep canyons alongside wild rivers, and passes through terrain where wildlife is as much a part of the landscape as the runners. Elk bugles echo during peak rut season, and you may share the course with moose, deer, eagles, and even the occasional wolf or bear.
For the 100M, runners cover more than 100 miles with 22,000ft of gain and equally punishing descent. This is a course for mountain athletes who want adventure, not comfort.
For those looking for a shorter but still rugged challenge, the Jughandle 20M offers a slice of the IMTUF spirit on September 21.
Logistics
The closest major airport is Boise Airport (BOI), located approximately 3 hours south of McCall. McCall, Idaho serves as the race’s host town and offers food, lodging, and supplies.
Driving Directions
Parking
Parking is available at Jug Mountain Ranch near the start and finish area. Crews and visitors must follow staff instructions and park only in designated areas at aid stations to protect access and safety.
Lodging
Runners may camp at Jug Mountain Ranch near the race start. Additional lodging options are available in McCall, including hotels, cabins, and vacation rentals.
Aid Stations
IMTUF features fully stocked aid stations that range from backcountry remote to lively trailhead gatherings. Crews and pacers will meet their runners at key stations like Upper Payette Lake, Snowslide Trailhead, and Chinook Campground. Expect standard ultra fare, hot food at select stations, and a strong community vibe to lift tired spirits. Exact mileage and cutoff times are detailed in the official race manual.
Race Requirements
Runners must be prepared for self-sufficiency in rugged backcountry conditions. Extensive mountain experience is strongly recommended. While there is no strict prerequisite to enter, runners should understand that serious injury or death is possible if unprepared.
Trail Work
Qualifying Races
There are no mandatory qualifying races, but entrants should have substantial mountain running or backcountry experience. IMTUF is not recommended for first-time ultramarathoners.
Mandatory Gear
There is no official mandatory gear list published for IMTUF, but runners are strongly encouraged to carry weatherproof clothing, hydration systems, nutrition, and safety gear appropriate for long stretches in remote, mountainous terrain.
Policies
Cancelations & Deferrals
IMTUF offers a 50% refund on entry fees until July 1, 2025 at 11:59PM. After July 1, no refunds will be issued. There are no rollovers or transfers of bibs. If the race must be canceled due to fire, severe weather, or other natural disasters, refunds or rollovers will not be possible. Runners should understand this risk before registering.
Dogs
Dogs are not permitted on the race course. They may be present at Jug Mountain Ranch or crew spots if kept leashed and under control at all times.
Crew, Pacers & Spectators
Crew and pacers are allowed, but must follow strict access rules outlined in the official Crew and Pacer Guide.
Pacers must check in at approved entry and exit points, wear a pacer bib, and never mule for their runner. Crew may only provide aid at designated locations.
Visitors are welcome at Jug Mountain Ranch for start and finish festivities, and at approved aid stations if they respect parking and safety guidelines.
Volunteers
Volunteers are essential to making IMTUF happen. The race welcomes helpers at aid stations, course setup, finish line operations, and more. Volunteers should be prepared for backcountry conditions and the spirit of mountain adventure. Sign-up information is shared through the IMTUF Facebook group and race communications.
Land Acknowledgement
The IMTUF 100 takes place on the ancestral lands of the Nez Perce (Nimiipuu) people, whose traditional territory includes the Salmon River Mountains and Payette region. We honor their deep connection to this land.
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