Idaho Falls to Spokane Road Trip: Scenic Drive Guide

This 430-mile journey along I-15 and I-90 takes you through eastern Idaho, Montana's rugged panhandle, and into Washington's rolling Palouse. The drive typically lasts 6.5 to 7.5 hours without heavy stops, but the real reward lies in the unexpected diversions.

One historical quirk: the town of Butte, Montana, once dubbed the 'Richest Hill on Earth,' sits at an elevation of 5,538 feet, making it one of the highest incorporated cities in the US. You'll climb over 6,000 feet at Monida Pass before descending into the Big Hole Valley.

For planning, refer to how to find the best stops and hidden gems between cities.

The primary route is I-15 north from Idaho Falls to Butte, then I-90 west to Spokane. Cell coverage is spotty between Dillon and Butte, and again near Lookout Pass.

• Fuel stops cluster around Idaho Falls, Dillon, Butte, and Missoula. After Missoula, stations become sparse until Coeur d'Alene.
• Expect gas prices to rise in Montana compared to Idaho; fill up in Idaho Falls or Missoula for better rates.
• Road quality is generally good, with smooth asphalt on interstates. However, sections of I-90 in Montana can have rough patches due to frost heaves.
• Rest areas are available at Monida Pass (elevation 6,800 ft) and near St. Regis, but services are limited in winter.

Winter driving requires caution: I-90 over Lookout Pass can close due to snow. Always carry chains from November through March.

• Best stops Idaho Falls, ID to Spokane, WA: Dillon (Museum of the Rockies), Butte (World Museum of Mining), Missoula (A Carousel for Missoula), Wallace (historic silver mining district), Coeur d'Alene (Tubbs Hill).
• Family suitability: Kids will enjoy the Discovery Center in Idaho Falls and the carousel in Missoula. Pet-friendly: Most rest stops allow leashed pets, and many hotels in Butte and Spokane accommodate pets.
• Fatigue management: Take breaks every 2 hours at scenic overlooks like the Big Hole Battlefield or the St. Regis River pullout. The drive is not overly taxing but the monotony of long straight roads can cause drowsiness.
• Hidden off-route spots: 7 miles off I-90 near St. Regis, the Savenac Historic Tree Nursery offers a peaceful walk among giant pines. Another gem: the ghost town of Garnet, east of Missoula, requires a dirt road but rewards with preserved buildings.

The geography shifts dramatically from Idaho's Snake River Plain to Montana's Beaverhead Mountains, then through the Bitterroot Valley and into the Palouse.

• Natural Landscapes: Hell's Half Acre lava field (west of Idaho Falls), Beaverhead Rock, Bitterroot Range, and Lake Coeur d'Alene.
• UNESCO Sites: None directly on route, but nearby Yellowstone National Park (a UNESCO site) is a 2-hour detour from Idaho Falls.
• Local Commerce: Butte has historic mining museums; Missoula offers art galleries; Coeur d'Alene has resort shopping.
• Culinary: Try huckleberry products in Montana, and finger steaks in Idaho Falls. Spokane's food scene includes farm-to-table options.