Twin Falls to Havre Road Trip: Montana's Hi-Line and Idaho's Snake River

Did you know that the route from Twin Falls to Havre roughly follows the 47th parallel north, crossing the Continental Divide at 6,352 feet near the Big Hole Valley? This road trip connects the volcanic Snake River Plain with the glaciated plains of northern Montana.

The drive covers 584 miles (940 km) via US-93, I-15, and US-87, taking about 9 hours without stops. But you'll want to pause at Shoshone Falls, the Salmon River, and the Missouri River headwaters.

The route passes through the Bitterroot Valley, the Big Hole National Battlefield, and the Bear Paw Battlefield. For those wondering how long to drive Twin Falls, ID to Havre, MT, the answer is about 9 hours of pure driving, but plan for a full day with stops.

US-93 from Twin Falls to Missoula is a well-maintained two-lane highway with some four-lane sections. After Missoula, I-15 takes you north to Shelby, then US-87 east to Havre. Gas stations become sparse north of Great Falls; fill up there.

• Fuel economy: expect 20-25 mpg; total fuel cost ~$100-$150
• Road conditions: good year-round, but winter can bring snow and ice, especially over Lost Trail Pass (7,014 ft)
• Cell service: AT&T and Verizon work in towns; dead zones in mountains and plains
• Food: Twin Falls has national chains; smaller towns offer local cafes. Pack snacks for long stretches.

For discovering unique stops along the way, see how to find the best stops and hidden gems between cities.

Leaving Twin Falls, you'll pass Shoshone Falls (212 ft, 20 ft taller than Niagara) on the Snake River. Then US-93 winds through the Salmon River canyon with steep walls and whitewater. In Montana, the Bitterroot Valley offers views of the Bitterroot Mountains, and the Big Hole Valley is a high-elevation grassland.

UNESCO World Heritage Sites: None directly on route, but nearby Waterton-Glacier International Peace Park (UNESCO) is a 2-hour detour from Kalispell. The route does pass the Lewis and Clark National Historic Trail, a UNESCO Memory of the World.

Local commerce: In Arco, ID, visit the Craters of the Moon National Monument for volcanic landscapes. In Salmon, ID, try the Sacajawea Interpretive Center. In Missoula, browse the farmers market. In Great Falls, tour the C.M. Russell Museum. In Havre, explore the Havre Beneath the Streets underground city.

Hidden off-route spots: Big Hole National Battlefield near Wisdom, MT, offers a sobering history of the Nez Perce War. Also, the Medicine Tree near Dillon, MT, is a historic cottonwood used by Native Americans. For a detour, head to the Beaverhead Rock State Park, a landmark for Lewis and Clark.

Infrastructure safety: Roads are mostly two-lane with passing lanes. Watch for wildlife (deer, elk, moose) at dawn/dusk. The speed limit is 65-70 mph on highways. Cell coverage is spotty, so download offline maps.

Family and child suitability: Great for kids aged 8+ who enjoy history and outdoor activities. Stop at the Lewis and Clark Interpretive Center in Great Falls, the Montana Dinosaur Center in Bynum (mom-and-pop with real fossils), and the Children's Museum of Montana in Great Falls.

Pet-friendly framework: Many motels along US-93 and US-87 accept pets. National forests (Bitterroot, Helena) allow dogs on trails. Always carry water and poop bags. Rest stops like the Lost Trail Pass rest area have grassy areas.

Fatigue management & rest zones: Plan to stop every 2 hours. Good rest areas include the St. Mary's Rest Area on US-93 (milepost 24 in MT) near the Canadian border, and the Dearborn Rest Area on I-15. For a longer break, pull off at the small towns: Wisdom, MT (pop. 100) has a gas station and cafe; Augusta, MT (pop. 300) is charming.

Culinary infrastructure: In Twin Falls, try the Snake River Grill for burgers. In Missoula, the Oxford is a dive bar staple. In Great Falls, the Roadhouse Diner serves classic American. In Havre, the Skylite Lounge has pizza. For a true local experience, visit the Toad Hall in Missoula for deli sandwiches.