Great Falls to Hill City: Epic Drive Through the Northern Plains

At the confluence of the Missouri and Sun Rivers, Great Falls, MT (elevation 3,280 ft) marks the start of a 420-mile drive south to Hill City, SD. The route uses I-15 S, I-94 E, US-85 S, and US-16 E, taking about 7 hours without stops. By 1880, this corridor served as a stagecoach route for gold miners bound for the Black Hills.

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

Road quality is high, but watch for wildlife (deer, antelope) especially at dawn/dusk on US-85. In winter, black ice forms on bridges. Rest areas along I-94 provide clean facilities every 60 miles.

Family-friendly stops: Little Bighorn Battlefield National Monument (near Hardin), Reptile Gardens (Rapid City), and Mount Rushmore (Keystone). All offer educational exhibits and restrooms.

• Pet-friendly: Most rest areas and many hotels allow pets; bring water. The Black Hills National Forest has off-leash trails.
• Fatigue management: Take a break every 2 hours. Consider stopping at the Lewis and Clark State Park (near Glendive) for a walk.

Hidden off-route spots: The Ekalaka Petrified Tree (off MT-7 near Ekalaka) and the ghost town of Ridge, MT (on US-212). For a detour, visit the North Unit of Theodore Roosevelt National Park (2.5 hours from Billings).

Fuel costs average $40-$60 depending on vehicle, with prices slightly higher in Montana due to lower taxes. Gas stations cluster at major exits: every 30-50 miles on I-15 and I-94, but sparse on US-85 between Belle Fourche and Spearfish. Plan to fill up in Billings (mile 180) and Belle Fourche (mile 340).

Cell reception is reliable on interstates but spotty on US-85; download offline maps. Road quality is excellent, with paved highways in good condition year-round. Winter driving (Nov-Mar) may require chains due to snow and ice on grades near the Black Hills.

• Montana speed limit: 80 mph on interstates, 65 mph on US highways
• South Dakota speed limit: 80 mph on interstates, 65 mph on US highways
• No toll roads on this route.

The route crosses two time zones: Mountain Time (Great Falls to eastern Montana) and Central Time (South Dakota). Adjust your watch near the Montana/Wyoming/South Dakota border.

The drive transitions from the Missouri River valley to the high plains of eastern Montana, then into the Black Hills. Highlights include the Little Missouri River Badlands (off I-94 near Glendive) and the 5,000-ft peaks of the Black Hills National Forest.

UNESCO sites: While none lie directly on the route, the nearby Yellowstone National Park (a World Heritage site) is a 3-hour detour from Livingston, MT. The route passes through the ancestral lands of the Lakota and Crow nations.

• Pompeys Pillar National Monument (near Billings): rock with Lewis and Clark signature
• Makoshika State Park (Glendive): badlands and fossil beds
• Deadwood, SD: historic gold rush town with casinos

Local commerce includes Montana's craft breweries (e.g., Uberbrew in Billings) and South Dakota's Western wear stores. In Hill City, the 1880 Train offers vintage rail excursions.