Wallace ID to Saratoga WY: Ultimate Road Trip Guide

This drive follows the historic Yellowstone Highway (US-20) and Interstate 90, a corridor once used by gold prospectors and later by early automobile tourists heading to Yellowstone. The route crosses the Continental Divide twice and descends from the lush Bitterroot Mountains into the high plains of Wyoming, where the North Platte River carves through ancient granite.

Before you set out, check road conditions: mountain passes like Teton Pass and Rabbit Ears Pass can close in winter, and summer thunderstorms bring hail and heavy rain. Cell coverage is sparse in rural sections, so download offline maps and carry a paper atlas as backup.

The total drive is 480 miles, typically taking 7.5 to 8 hours without stops. The route is a mix of Interstates 90 and 15, and US-20, all well-maintained. Fuel is readily available in towns like Butte, Idaho Falls, and Dubois, but stations can be 60-80 miles apart on the final stretch, so top off when you see a station.

Bridge and tunnel tolls: none on this route. Expect average gas costs of $50-$60 for a sedan, depending on current prices. For electric vehicles, charging stations are available in Butte and Idaho Falls, but sparse elsewhere—plan accordingly.

• Rest areas: frequent along I-90 and I-15, with picnic tables and restrooms.
• Scenic byways: the drive through the Bighorn National Forest (US-14) is a detour, but the main route is not a designated scenic byway.
• Weather: altitude makes for rapid changes; carry chains from October to May.

Road quality is generally good, but watch for wildlife at dusk—deer and elk are common. Speed limits are 80 mph on interstates, 65 on US-20. Construction zones are frequent in summer; obey posted signs and fines are doubled.

For families, the best stops include the Teton Valley History Museum in Driggs (free, interactive exhibits) and the Wyoming Dinosaur Center in Thermopolis (minor detour, features real fossils). Children will enjoy the playgrounds at the Idaho Falls Greenbelt.

Pet-friendly: Most motels along the route accept pets, with some charging a fee. Rest stops have pet exercise areas. For fatigue management, plan a break every 2 hours; notable rest zones include the Malad Summit Rest Area (mile 16 on I-15) and the Saratoga Rest Area at the end of the journey.

The route transitions from the cedar forests of northern Idaho to the sagebrush steppe of Wyoming. Notable natural attractions include the Shoshone Falls near Twin Falls (accessible via a 30-mile detour) and the geothermal features of Yellowstone National Park, which lies just north of the route. For a unique geologic stop, visit the Idaho National Laboratory's Experimental Breeder Reactor No. 1, the first nuclear power plant to generate electricity (now a museum).

Local commerce thrives on tourism and ranching. In Wallace, the historic Silver Streak Zipline offers a unique perspective, while Saratoga is known for its hot springs and fishing-accessible North Platte River. If you're interested in how to find the best stops and hidden gems between cities, this route is a prime example.