Idaho Falls to Hill City Road Trip Guide: Scenic Drive

Driving from Idaho Falls, ID to Hill City, SD covers roughly 560 miles along I-15, I-90, and US-16, a route that transitions from the volcanic Snake River Plain to the rugged Black Hills. The drive typically takes 8 to 9 hours without stops, but you'll want to allocate at least two days to absorb the landscapes.

A little-known fact: the route crosses the Continental Divide twice — once near Monida Pass on the Idaho-Montana border and again near Powder River Pass in Wyoming. This double crossing is a rare geographical quirk that influences weather patterns and watersheds along the way.

For tips on uncovering hidden stops between cities, check out how to find the best stops and hidden gems between cities.

Route Overview Table

This route passes through two iconic national parks: Yellowstone and Grand Teton (if you detour south), plus the Black Hills National Forest. The landscapes shift from sagebrush steppe to alpine meadows to ponderosa pine forests.

• Idaho Falls: Waterfront pathways along the Snake River; the Idaho Falls Temple is a notable landmark.
• West Yellowstone: Gateway to Yellowstone's geysers and hot springs; Old Faithful is 45 min drive inside the park.
• Buffalo, WY: Near the Bighorn Mountains; Cloud Peak Wilderness offers hiking.
• Hill City: Surrounded by granite peaks; Crazy Horse Memorial and Mount Rushmore nearby.

Local commerce thrives on tourism and ranching. In Cody, the historic downtown has shops selling Western wear and cowboy gear. In Hill City, art galleries and gemstone shops line the main street. Don't miss the 1880 Train, a steam locomotive offering scenic rides.

The region has no UNESCO World Heritage Sites directly on route, but Yellowstone National Park (a UNESCO site) lies just west of the route. The Black Hills are culturally significant to the Lakota people, though not UNESCO listed.

Fuel economy on this route varies with elevation changes. Expect 20-25 mpg in a standard sedan. Gas stations are plentiful along interstates but sparse on secondary roads; fill up in Idaho Falls, West Yellowstone, Cody, and Buffalo, WY.

• Idaho Falls, ID: Plentiful stations at I-15 exits.
• West Yellowstone, MT: Limited but adequate; premium fuel available.
• Cody, WY: Full service; next major town is Buffalo, 120 mi east.
• Hill City, SD: Several stations; prices higher than interstate.

Road surfaces: I-15 and I-90 are well-maintained. US-20 through Yellowstone is paved but winding. US-16 from Cody to Hill City is two-lane with occasional frost heaves in spring.

Driving Milestones Table

Road quality is generally good, but watch for wildlife on US-16 near the Wyoming-South Dakota border, especially at dusk. Winter travel requires snow tires or chains; summer brings construction zones. Always carry water and snacks.

• Family-friendly stops: Grizzly & Wolf Discovery Center in West Yellowstone; Buffalo Bill Center of the West in Cody; Reptile Gardens near Hill City.
• Pet-friendly framework: Most national forest areas allow dogs on leash; Yellowstone only allows pets in developed areas. Pack waste bags and a collapsible bowl.

Fatigue management: Plan rest stops every 2 hours or 120 miles. Notable rest areas: Beaverhead Rest Area (MT) on I-15 near Dillon; Spearfish Rest Area (SD) on I-90. Caffeine is available at small-town cafes; try the Cowboy Coffee in Buffalo, WY.

Hidden off-route spots: The ghost town of Kirwin, WY (south of Meeteetse) is a 20-mile gravel road but rewards with preserved mining cabins. In the Black Hills, take the Needles Highway (SD 87) for towering granite spires.