Twin Falls to Spokane: A Deep Dive into Idaho's Scenic Highway 93

From Twin Falls, Idaho, to Spokane, Washington, the 541-mile journey along US-93 and I-90 crosses the spine of the Sawtooth Range, a geological uplift formed 50 million years ago by volcanic activity. In Stanley, Idaho, at mile marker 135, you'll cross the 7,200-foot Galena Summit – the highest paved pass in Idaho outside a national park. This road trip is not a straight shot; it's a steady climb into alpine forests and then a descent into the Columbia Basin's dry, volcanic terrain. The route takes roughly 8 hours and 30 minutes of pure driving time, but factoring in stops, plan for a full day or a two-day adventure.

Is it worth driving Twin Falls, ID to Spokane, WA? Absolutely, if you crave biodiversity: the route stitches together sagebrush steppe, lodgepole pine forests, and palouse grasslands. The question of how long to drive Twin Falls, ID to Spokane, WA depends on your pace; with wildlife viewing and short walks, budget 10-12 hours. This guide will help you find the best stops between these two cities.

Leaving Twin Falls, the Snake River Plain is a basalt plateau carved by the Bonneville Flood 14,500 years ago. At Shoshone Falls (27 miles east of I-84), the 212-foot drop reveals layered basalt columns. As US-93 climbs north, sagebrush gives way to juniper and then ponderosa pine. Near Stanley (elevation 6,260 ft), the Sawtooth Mountains rise abruptly – 10,000-foot peaks with cirque lakes like Redfish Lake, a remnant of glaciation. The Salmon River, the longest free-flowing river in the lower 48, parallels US-93 for 50 miles; rafting season is June-August.

Cultural stops: The Big Hole National Battlefield (mile 240) interprets the 1877 Nez Perce War. In Missoula, the Carousel for Missoula (hand-carved, 1995) and the Missoula Art Museum (free) reflect local commerce. Spokane's Riverfront Park, site of the 1974 World's Fair, features the Spokane Falls and the historic Pavilion. Along the route, local merchants sell huckleberry products (jams, syrups) in Stanley and Missoula; the Huckleberry Patch in Salmon has over 200 huckleberry items.

• UNESCO status: None on route, but nearby Yellowstone (3 hours from Twin Falls) and Glacier (4 hours from Missoula) are World Heritage sites.
• Hidden gem: The ghost town of Custer (mile 165), abandoned in 1910, with a restored schoolhouse.
• For tips on discovering unique stops, see how to find the best stops and hidden gems between cities.

US-93 from Twin Falls to Missoula is a two-lane highway with passing lanes every 10-15 miles. In Idaho, speed limits drop to 55 mph near curves; Montana's section allows 70 mph. I-90 from Missoula to Spokane is a four-lane freeway, smooth and fast. Fuel stations cluster in towns every 30-40 miles along US-93, but between Challis and Salmon (60-mile stretch), there's no gas – fill up in Challis, ID (mile 175). Diesel and 91 octane are available at larger stations in Twin Falls, Stanley, and Missoula. Average fuel price along the route is $3.45/gal (2025 data).

Cellular coverage: AT&T and Verizon have gaps near Galena Summit and north of Salmon. Download offline maps for US-93 segments. Rest areas include the Stanley Rest Area (mile 142) with restrooms and picnic tables, and the Lost Trail Pass Rest Area (mile 210) on the Montana border. Overnight lodging: Stanley offers historic cabins (e.g., Mountain Village Resort, $150/night), while Missoula has chain hotels near I-90 exit 105. Camping: primitive sites along the Salmon River (free, no services) and developed campgrounds at Redfish Lake (fee $25/night).

• Best stops Twin Falls, ID to Spokane, WA: Shoshone Falls (Twin Falls, mile 0), Redfish Lake (Stanley, mile 145), Salmon River Scenic Byway (mile 155-210), Lost Trail Pass (mile 210), Big Hole Battlefield (mile 240), Missoula downtown (mile 310), Coeur d'Alene Lake (mile 500).
• How long to drive Twin Falls, ID to Spokane, WA? Non-stop 8.5 hours, but plan for 11-12 hours with stops.

Road safety: US-93 north of Stanley has sharp curves and occasional livestock (cattle and elk). In winter (Nov-Mar), chains may be required on Galena Summit; check Idaho 511 for conditions. I-90 from Coeur d'Alene to Spokane has heavy truck traffic; maintain safe following distance. Fatigue management: the longest straight stretch is 45 miles near Arco, ID; plan a break every 2 hours at rest areas or towns. Rest zones: Stanley (coffee at Redfish Lake Lodge), Salmon (McDonald's with Wi-Fi), Missoula (tennis courts at Bitterroot Park).

Family suitability: Shoshone Falls (small fee $3) is stroller-friendly; Redfish Lake has a sandy beach and easy trails. The Mule Days festival in Salmon (June) features parades and animal rides. Child-friendly dining: The Wagon Wheel in Salmon (pizza and arcade games) and the Press Box Pizza in Missoula (game room). Pet-friendly framework: Pets on leash allowed at Shoshone Falls and Redfish Lake trails; most lodges in Stanley accept dogs ($25 fee). I-90 rest areas have designated pet areas at mile 456 (St. Regis) and mile 496 (Coeur d'Alene).

• Culinary infrastructure: Stanley's Kasino Club (burgers), Missoula's Market on Front (farm-to-table), and Spokane's Gander & Ryegrass (pancakes). Vegetarian options limited in rural sections; pack snacks.
• Hidden off-route spots: The Earth Science Museum in Challis (free, fossils) and the St. Mary's Mission in Stevensville, MT (oldest church in Montana).
• Local commerce: Don't miss Harriman Trailhead (mile 155) for short hikes; the Stanley Museum (donation) exhibits mining artifacts.