📷 Photo by Judy Beth Morris on UnsplashHarriman State Park
Island Park, ID
A former railroad-family ranch on the Henrys Fork, now a wildlife refuge with trumpeter swans, moose and historic ranch buildings. Day-use fee; trails for walking and cycling.
Harriman State Park is a state park near Island Park in eastern Idaho, inside a 16,000-acre (about 65 km²) wildlife refuge in the Greater Yellowstone Ecosystem. It lies in the Henry's Fork Caldera, a volcanic collapse basin. The Henrys Fork runs for about eight miles (13 km) through the park and counts as one of the best fly-fishing rivers in the US.
If you keep your eyes open, you may spot moose, elk and trumpeter swans, according to Visit Idaho. More than 22 miles (35 km) of hiking, mountain biking and horseback trails cross the grounds; guided trail rides run from June 1 to October 31. The park's history is tied to the railroad industry.
The park is worth a visit in winter too: there are more than 24 miles of groomed routes for cross-country skiing and snowshoeing, and fat biking is possible (as of October 2026, check details beforehand). It also works as a day stop and a quieter alternative to the crowded Yellowstone gateways.
- Nearest town
- Island Park, ID
- Category
- Nature & parks
- GPS
- 44.3226, -111.4604
Hours, fees and access change. Confirm with the operator or park before you go.
Good to know
Best time to go
The most pleasant months are usually May–June and September. Still fine, with some compromises, in July–August. Cold, short days in December–March. (Estimate from long-term temperature averages, terrain and pass seasons)
Featured in these trip guides
Nearby
Campsites nearby
- Buttermilk CampgroundCampsite8 mi from Harriman State ParkTentsCaravansMotorhomesElectricityDrinking waterToilets
- Buffalo CampgroundCampsite9 mi from Harriman State ParkTentsCaravansMotorhomesElectricityDrinking waterToilets
- McCrea Bridge CampgroundCampsite10 mi from Harriman State Park · 23 pitchesTentsCaravansMotorhomesDrinking waterToilets
- Upper Coffeepot CampgroundCampsite13 mi from Harriman State Park · 14 pitchesTentsCaravansMotorhomesElectricityDrinking waterToilets
- Grandview CampgroundCampsite13 mi from Harriman State Park · 9 pitchesTentsMotorhomesElectricityDrinking waterToilets
- Warm River CampgroundCampsite16 mi from Harriman State ParkTentsCaravansMotorhomesElectricityDrinking waterToilets
All campsites in Idaho · Campsite data: © OpenStreetMap contributors, ODbL 1.0 · Updated October 3, 2026
FAQs
Where is Harriman State Park?
Harriman State Park is in Island Park, ID, at GPS 44.3226, -111.4604. It is about 29 mi from West Yellowstone.
Can you camp near Harriman State Park?
Yes. The nearest campsite listed in OpenStreetMap is Buffalo Run RV Park & Cabins, about 5 mi away; within 25 mi there are 19 campsites and motorhome stopovers.
Which road trips pass Harriman State Park?
Harriman State Park is a stop on these CampingSpirit trip guides: Mesa Falls to Yellowstone’s Grand Canyon, Hayden Valley and Cody.
What is there to see near Harriman State Park?
Places worth a stop nearby: Upper Mesa Falls (11 mi), Old Faithful Inn (33 mi), Old Faithful (33 mi) and Grand Prismatic Spring (34 mi).
When is the best time to visit Harriman State Park?
The most pleasant months are usually May–June and September. Still fine, with some compromises, in July–August. (Estimate from long-term temperature averages, terrain and pass seasons)