Medora to Island Park: A Road Trip Through the Badlands & Rockies

This 900-mile journey from Medora, ND to Island Park, ID crosses two time zones and three states, following I-94 west then US-287 south. The route begins in the haunting badlands of the Little Missouri River, carved by ancient floods, and ends in the volcanic caldera of the Greater Yellowstone Ecosystem. A surprising fact: near Three Forks, MT, you cross the headwaters of the Missouri River, where Lewis and Clark once portaged.

How long to drive Medora, ND to Island Park, ID? Plan for 13–15 hours of pure driving time, but is it worth driving Medora, ND to Island Park, ID? Absolutely—this route offers an unparalleled cross-section of North American geography, from prairie to mountain.

Use this guide to find the best stops Medora, ND to Island Park, ID. For more tips on uncovering hidden gems, see our guide on how to find the best stops and hidden gems between cities.

Fuel stops are abundant along the interstates but sparse on US-287 through Wyoming. In Montana, gas stations appear every 30–50 miles on I-94 and I-90. The stretch from Three Forks to West Yellowstone has fewer options; fill up in Bozeman, MT. Diesel and premium fuel are standard. Expect fuel costs around $4–5/gallon (2025 estimates).

• Key fuel points: Medora, ND; Miles City, MT; Billings, MT; Bozeman, MT; West Yellowstone, MT; Island Park, ID.
• Rest stops: Montana rest areas are basic but clean; Wyoming has picnic areas with no facilities.
• Road quality: Interstates are excellent; US-287 south of I-90 is a narrow two-lane road with rolling hills. Watch for cattle and deer.

The drive transitions from the eroded buttes of Theodore Roosevelt National Park (near Medora) to the lush Gallatin National Forest. Near Bozeman, you'll see the Bridger Range; further south, the Madison River valley opens into a volcanic plateau. This region is part of the Yellowstone Caldera, one of the world's largest active volcanic systems.

• Natural attractions: Theodore Roosevelt NP (ND), Pompeys Pillar (MT), Yellowstone NP (WY/ID).
• Local commerce: In Medora, stock up on bison jerky; in Bozeman, try local microbrews; in West Yellowstone, buy huckleberry products.
• UNESCO sites: Yellowstone National Park (designated 1978) is a World Heritage Site—enter through West Yellowstone for a dramatic approach.

Safety first: Montana does not have a speed limit on some highways, but posted limits are 70–80 mph. Wildlife collisions are common—elk, deer, and bison. Use high beams when alone and watch for reflective eyes. In winter, carry chains; I-90 is often snow-packed.

• Family suitability: Kid-friendly stops include the Museum of the Rockies (Bozeman) and Grizzly & Wolf Discovery Center (West Yellowstone).
• Pet-friendly: Yellowstone allows pets on leash in developed areas; rest stops in Montana have pet areas. National parks restrict dogs on trails.
• Fatigue management: Take breaks every 2 hours. Rest zones include Powder River Crossing (MT) and Ennis Lake (MT).
• Hidden off-route spots: Stop at the ghost town of Bannack, MT (50 miles off I-15); or the Red Rock Lakes National Wildlife Refuge (near Lima, MT) for birdwatching.