Two laps of a 25K clover leaf through Idaho's Harriman State Park
Other trail races within 171 miles
The longest race at Harriman, called the Venti by the race, runs two laps of a 25K clover-leaf course through Harriman State Park near Island Park, Idaho. The route mixes gravel, two-track and pine-needle singletrack through forest and open meadow, with views of the Tetons. Runners pass the single on-course aid station four times, and the race is cupless, so bring your own drinking vessel. The course was rerouted and its direction changed for 2026.
Suitable for first-timers
Island Park, ID, United StatesAugust 14, 2027
Harriman Ultra Trail Runs 50K is a multi-loop trail race in Island Park, ID, United States, held on August 14, 2027. The course covers 31.1 miles.
The route for this edition is not published yet.
No dogs are allowed anywhere in Harriman State Park except the parking areas. The race asks runners to leave dogs at home, and dogs may not run with a runner.
No camping inside Harriman State Park, but yurts and park buildings can be rented. Forest Service campgrounds and dispersed camping are nearby (see recreation.gov and Caribou-Targhee National Forest). Hotels and rentals run from West Yellowstone to Ashton, 5 to 45 minutes away.
Mid-August highs at Harriman have reached the high 80s F in recent years. Open meadow sections leave runners in the sun, and the race says many 50K runners struggle on the second lap from too little water and electrolytes.
The race warns of highs in the high 80s F, with dehydration and cramping common on the second 50K lap
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