Harriman State Park lies within an 16,000-acre wildlife refuge in the greater Yellowstone Ecosystem. Moose, Elk, and Sandhill Cranes are common, as is North America's largest waterfowl, the Trumpeter Swan. Known as one of the best fly-fishing streams in the nation, the Henrys Fork meanders for eight miles through Harriman. Over 20 miles of trails are available for hiking, biking, horseback riding, and cross county skiing. Guided horseback tours are offered by a park vendor, Dry Ridge Outfitters, 208-558-RIDE (7433).


Eastern Idaho, 18 miles N. of Ashton on Hwy. 20


From Ashton go N. on Hwy 20 about 18 mi. From West Yellowstone travel S. on Hwy 20 about 37 mi. The park entrance is located on the west side of Hwy 20.

Nearest City

Island Park

Street Address

3489 Green Canyon Rd
Island Park ID, 83429

Mailing Address

3489 Green Canyon Rd
Island Park ID, 83429


All Year


7am-10pm daily


$5/vehicle/day or Season pass $40/year, $20 per bus


Gift Shop, Parking, Restrooms, Visitor Center, Warming Hut

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