Idaho Falls to Havre: Epic Montana Drive Guide

On US-20 eastbound out of Idaho Falls, the Snake River Plain opens into a vast sagebrush sea. This 440-mile route to Havre, MT, traces the path of the Lewis and Clark expedition, passing through landscapes shaped by ancient floods and glacial retreat.

The drive takes roughly 7 hours without stops, but the real journey lies in the detours. From simmering hot springs to dinosaur fossils, the corridor between Idaho Falls and Havre is a museum of natural history. Knowing how to find the best stops and hidden gems between cities transforms this highway into a treasure hunt.

The route primarily follows Interstates 15 and 90, with a final stretch on US-87. Road conditions are generally excellent, though winter driving can be treacherous. Gas stations are sparse on US-87; fill up in Great Falls.

• Fuel stops: Idaho Falls, Dillon, Butte, Helena, Great Falls, Havre. Recommended to fill up when below half tank.
• EV charging: Tesla Superchargers in Idaho Falls, Butte, and Great Falls. Other EVs may need Level 2 at hotels.
• Rest areas: St. Anthony Rest Area (ID), Clark Canyon Dam Rest Area (MT), and numerous pullouts.

The first highlight is the Continental Divide at Monida Pass (6,870 ft). Wildlife spotting is common—pronghorn, mule deer, and occasional moose. The Beaverhead Mountains frame the horizon.

Natural Landscapes & Attractions

• Clark Canyon Reservoir: Camping, fishing, and a Lewis and Clark interpretive site.
• Grasshopper Creek: Gold discovery site in 1862; still pan for gold.
• Lewis and Clark Caverns State Park: Guided tours through limestone caves (book ahead).
• Giant Springs State Park: One of the largest freshwater springs in the US, near Great Falls.
• Missouri River Breaks: Rugged canyons and teepee rings; a must for history buffs.

UNESCO World Heritage Sites

While no official UNESCO sites lie directly on the route, the nearby Waterton-Glacier International Peace Park (UNESCO World Heritage Site) is a 2-hour detour from Great Falls. Also, the Yellowstone National Park (UNESCO) is accessible via a 3-hour drive south from Idaho Falls.

Local Commerce & Culture

• Dillon: Beaverhead County Museum, local wineries like River Ridge Vineyard.
• Butte: Historic mining district, The Berkley Pit, and the World Museum of Mining.
• Great Falls: C.M. Russell Museum, Gibson Park, and craft breweries (Mighty Mo Brewing).
• Havre: The Havre Beneath the Streets (underground tunnels from the 1900s), Blaine County Museum.

Infrastructure Safety & Road Quality

I-15 is well-maintained with clear signage. US-87 from Great Falls to Havre is a two-lane highway; overtake cautiously. Cell service is intermittent between Lima and Dillon, and between Fort Benton and Havre.

Fatigue Management & Rest Zones

Plan stops every 2 hours. Good rest areas: St. Anthony (ID), Clark Canyon (MT), and the many pullouts along the Missouri River. Dillon and Butte offer numerous motels for an overnight stop.

Family and Child Suitability

• Lewis and Clark Caverns: Educational tours, suitable for ages 6+.
• Giant Springs: Easy walking paths, picnic areas, and a fish hatchery.
• First Peoples Buffalo Jump State Park: Interpretive center and short hikes.
• Children's Museum of Montana (Great Falls): Interactive exhibits.

Pet-Friendly Framework

• Most rest areas allow pets on leash.
• State parks: Pets allowed on trails except at Lewis and Clark Caverns (not allowed inside cave).
• Hotels: Best Western, Super 8, and Motel 6 chains are pet-friendly in most towns.

Hidden Off-Route Spots

• Elkhorn Hot Springs (near Dillon): Natural hot springs in a rustic setting.
• Pioneer Mountains Scenic Byway: 70-mile loop from Dillon to Wise River; ghost towns and hiking.
• Upper Missouri River Breaks National Monument: Remote, stunning canyons; accessible via dirt roads.

Culinary Infrastructure

• Idaho Falls: Snake Bite Café (breakfast), The Midnight Dinner (comfort food).
• Dillon: Sparks Café (American), Sacajawea Inn (steakhouse).
• Butte: Pork Chop John's (iconic), Uptown Cafe (fine dining).
• Great Falls: Bert & Ernie's (sourdough pizza), Roadhouse Diner (classic).
• Havre: The Loft (burgers), G's (Mexican food).

Climatic Conditions & Route Aesthetics

Summer (June-Sept): 70-90°F, afternoon thunderstorms possible. Fall: crisp, golden aspen. Winter: snow likely, especially Monida Pass; carry chains. Spring: windy, muddy roads on US-87.