Road Trip Guide: Pocatello, ID to Havre, MT

This route traces the historic Oregon Trail and Lewis and Clark Trail, passing through the Continental Divide at Monida Pass (elevation 6,870 feet) on Interstate 15, a critical juncture for westward expansion in the 19th century.

The journey covers roughly 490 miles (789 km) of High Plains and mountain valleys, with a recommended drive time of 7.5 to 8 hours without extended stops. It offers a cross-section of Montana's diverse geography, from the lava plains near Arco to the golden wheat fields of the Golden Triangle.

The route traverses three distinct ecosystems: the sagebrush steppe of southern Idaho, the pine forests of the Beaverhead-Deerlodge National Forest, and the prairie grasslands of northern Montana. Hidden off-route spots include the ghost town of Bannack (west of Dillon), now a state park with well-preserved 19th-century buildings, and the Ringing Rocks near Whitehall, where boulders produce metallic tones when struck.

UNESCO World Heritage Sites are not directly on the route, but the nearest, Yellowstone National Park, is a 2-hour detour south from I-15 at Idaho Falls.

Local commerce thrives in small towns like Deer Lodge, which hosts the Montana State Prison Museum, and Shelby, known for its grain elevators and the '49ers' sculpture. Culinary options range from Basque-influenced restaurants in Boise (though off-route) to classic diners and steakhouses in Butte and Great Falls.

Interstate 15 (I-15) and US-87, US-2 are the primary highways. Fuel costs average about $0.20 per mile, and gas stations are sparse between some segments, especially from Idaho Falls to Dillon (110 miles) and from Great Falls to Havre (120 miles).

• Major fuel stops: Idaho Falls, ID; Dillon, MT; Butte, MT; Great Falls, MT; Havre, MT.
• Road quality is generally good, with some rough patches in construction zones near Butte and Great Falls.
• Rest areas are well-maintained but limited; plan for stops at larger towns.

No tolls on this route. Cell coverage is spotty in rural areas, especially in the mountains; download offline maps.

Winter driving is hazardous from November to March; carry chains and emergency kit. Summer thunderstorms are common, with hail possible near Great Falls. The speed limit is 80 mph on I-15, but reduce speed in construction zones.

Best stops for families: Yellowstone Bear World in Rexburg (30 min detour), the Children's Museum of Montana in Great Falls, and the H. Earl Clack Museum in Havre. Pet-friendly accommodations are prevalent; many hotels allow pets for a nominal fee, and rest areas have pet exercise areas.

Fatigue management: take a break every 2 hours or 150 miles; rest areas are plentiful near towns but sparse in between. A good midpoint stop is Butte, which has a large 'Our Lady of the Rockies' statue visible from the highway.

For discovering more how to find the best stops and hidden gems between cities, check that guide.