Alpine WY to Athol ID Road Trip Guide: Scenic Stops & Tips

Alpine, Wyoming sits at the confluence of the Snake and Greys Rivers, while Athol, Idaho lies just east of Coeur d'Alene. The 430-mile drive between them crosses three distinct geological provinces: the Rocky Mountains, the Snake River Plain, and the Columbia Plateau. A little-known fact: near Soda Springs, Idaho, you'll pass the site of the world's only captive geyser, a remnant of early geothermal drilling.

This guide covers everything from fuel economics to hidden off-route spots. For a philosophy on finding the best stops, see our article on how to find the best stops and hidden gems between cities.

From Alpine, take US-26 west through the Caribou-Targhee National Forest. At the Idaho border, continue on US-26 to Idaho Falls (about 2.5 hours). In Idaho Falls, merge onto I-15 north for 110 miles to Dillon, MT. Then take I-90 west for 200 miles to Athol. Total driving time averages 7.5 hours with light traffic.

• Key junctions: US-26/US-20 junction near Arco; I-15 exit 119 for I-90 west.
• Towns with major services: Idaho Falls, Dillon, Butte, Missoula, Coeur d'Alene.
• Road conditions: Most is divided highway; mountain passes (e.g., Monida Pass) require winter tires Nov–Apr.

Fuel costs vary: expect $3.50–$4.00/gallon in Wyoming, $3.20–$3.70 in Idaho and Montana. The longest stretch without gas is 65 miles between Arco and Carey on US-20. Plan refueling at Idaho Falls and Missoula.

• Recommended fuel stops: Sinclair in Alpine; Flying J in Idaho Falls; Town Pump in Dillon; Costco in Missoula.
• Alternative fuels: Ethanol-free premium available in Idaho Falls (Kum & Go). No public EV charging in remote stretches.

The route offers four dramatic landscape transitions. West of Alpine, US-26 hugs the Snake River through gorges and sagebrush. Near Palisades Reservoir, the water’s turquoise hue contrasts with pine-covered slopes. As you enter Idaho’s lava fields, the terrain flattens into volcanic plains dotted with cinder cones.

• Must-see: Mesa Falls Scenic Byway (off US-20) – a 4-mile detour to two powerful waterfalls.
• Craters of the Moon National Monument & Preserve – otherworldly basalt flows, lava tubes, and sagebrush. Entry $20/vehicle.
• After Missoula, I-90 climbs through the Bitterroot Range with striking views of the Lochsa River canyon.

Local commerce reflects the region’s history. In Alpine, visit the historic Mangy Moose Saloon. In Arco, the world’s first nuclear reactor (EBR-I) is open for tours. Butte offers a revitalized uptown with copper-mining museums and craft breweries. Missoula’s farmers market (Saturdays, May–Oct) features huckleberry products and bison jerky.

• Hidden gem: The town of Wallace, ID (exit 61 on I-90) – a one-street historic mining town with a bordello museum and the world’s third-longest gondola ride just north.
• For authentic Idaho cuisine: try finger steaks (beef strips fried in batter) at the Broken Spoke in Coeur d'Alene or a huckleberry shake at the Huckleberry Patch in Kellogg.

Road quality is generally good. I-90 is well-maintained; US-20 east of Arco has some rough patches. Winter hazards include black ice on Monida Pass (7,000 ft) and sudden snow squalls in the Craters of the Moon area. Cell service is intermittent from Alpine to Carey; download offline maps.

• Emergency services: Wyoming Highway Patrol (WHP); Idaho State Police (ISP) covering US-20; Montana Highway Patrol (MHP) for I-15 and I-90.
• Hospital locations: St. John's Health in Jackson, WY (50 miles from Alpine); Eastern Idaho Regional Medical Center in Idaho Falls; St. Patrick Hospital in Missoula.

Family-friendly stops include the Tautphaus Park Zoo in Idaho Falls (small but engaging) and the Missoula Carousel, a hand-carved wooden masterpiece. For kids, the Discovery Science Center (Idaho Falls) offers hands-on exhibits. Pet-friendly accommodations: most motels in Dillon and Butte allow dogs with a fee. Rest areas with dog runs are at Exit 23 (I-15) and near Lost Trail Pass (I-90).

• Fatigue management: Plan stops every 2 hours. Recommended rest zones: Palisades Reservoir picnic area (mile 290 on US-26), the scenic overlook at Monida Pass (I-15), and the visitor center at the Idaho-Montana border near Lost Trail Pass.
• Unique rest area: The “Cowboy” rest stop on I-90 near St. Regis, MT, has a mounted elk and free coffee.