A short Harriman State Park run on the Silver Lake Trail
Other trail races within 171 miles
The Tall, new in 2026 in place of the older 8.1-mile race, leaves the Boy's House lawn on two-tracks to the on-course aid station and then follows the Silver Lake Trail. Runners pass the aid station once. The race is cupless, so bring your own drinking vessel.
Suitable for first-timers
Island Park, ID, United StatesAugust 14, 2027
Harriman Ultra Trail Runs 10K is a loop trail race in Island Park, ID, United States, held on August 14, 2027. The course covers 6.2 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.
The race warns that mid-August highs have reached the high 80s F
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