Afton to Athol: Scenic Drive Guide

Starting in Afton, Wyoming—home to the world's largest elk antler arch—this route to Athol, Idaho crosses the Snake River Plain and the Bitterroot Range. The 620-mile journey takes about 10 hours of pure driving time, but plan for a full day to appreciate the geological and cultural transitions.

The path follows US-89 north to Jackson, then US-26/US-20 through Idaho Falls and Arco, and finally US-93 north to Missoula before cutting west on I-90 to Athol. This route avoids the busier I-80 corridor and offers a mix of high desert, volcanic badlands, and alpine forests.

From Afton, the Salt River Range gives way to the Snake River Valley. The Tetons loom east of Jackson, but the route itself hugs the western foothills. After Idaho Falls, the landscape transforms into the Snake River Plain, an ancient volcanic flood basalt region. Craters of the Moon National Monument (just off US-20 near Arco) preserves this otherworldly terrain; it's a UNESCO World Heritage Site candidate and a must-see for geology enthusiasts.

North of Arco, the Lost River Range anchors the horizon, and US-93 climbs over the Continental Divide at 7,000 feet. The Salmon River near Challis offers rafting opportunities. Local commerce along the way includes small ranching towns like Mackay and Darby, where you can find cowboy bars and family diners serving huckleberry milkshakes in season. For a unique souvenir, visit the Idaho Potato Museum in Blackfoot, just off I-15, but that requires a detour east of Idaho Falls.

The route ends in Athol, near the Idaho Panhandle National Forests and Coeur d'Alene Lake. This area is known for its timber industry and outdoor recreation. For more on how to find the best stops and hidden gems between cities, check Wayro's travel blog.

Weather can be extreme: winter brings snow and icy patches, while summer sees afternoon thunderstorms and high winds on the Snake River Plain. Always check forecasts and carry chains in winter. The route crosses several wildlife corridors, so watch for elk and deer, especially at dawn and dusk.

For families, the most engaging stops are Craters of the Moon (with its cave tours and lava tubes), the Idaho Falls River Walk with its greenbelt and playgrounds, and the Missoula Carousel, a historic wooden carousel. For pets, the Targhee National Forest offers dog-friendly trails near Afton, and most rest areas have designated pet areas. Keep dogs on leashes in developed areas.

Fatigue management is key: take breaks every two hours. Recommended rest zones include the Idaho Falls rest area (off US-20), the Arco rest area (with views of the mountains), and the Lost Trail Pass rest area at the Montana border. Coffee and snacks are available at gas stations in smaller towns like Challis and Hamilton.

Road quality is generally good, but the two-lane sections require patience. Use pullouts to let faster traffic pass. The final stretch on I-90 is smooth and wide, making for a relaxed arrival into Athol.

Fuel stops are sparse between Idaho Falls and Arco, so fill up in Idaho Falls. Gas prices are typically 10-15 cents cheaper in Idaho than Wyoming, making it economical to fuel up after crossing the border. Restrooms and services are available at major towns along the way, but the stretch from Arco to Challis has limited amenities.

• US-89 has some sharp curves through Star Valley, but the road is well-maintained.
• US-20/US-26 is a four-lane highway through Idaho Falls.
• US-93 north of Arco is a two-lane road with occasional passing lanes.
• I-90 from Missoula to Athol is a modern interstate with rest areas every 30 miles.

Cell phone coverage is patchy in the mountains, especially near the Idaho-Montana border. Download offline maps before leaving Afton or Idaho Falls. The only toll road on the entire route is the US-20 toll bridge in Idaho Falls, costing $1.50 for cars.