Wallace to Thermopolis: Scenic Idaho-Wyoming Drive Guide

The route from Wallace, Idaho to Thermopolis, Wyoming covers 480 miles through the Bitterroot Range, Yellowstone’s edge, and Wyoming’s Bighorn Basin. Along U.S. Highway 12 and Interstates 90/94, you’ll cross the Continental Divide at 8,000 feet and pass near the site of the 1959 Hebgen Lake earthquake, which reshaped the Madison River canyon.

This drive is a study in contrasts: lush Idaho forests, volcanic plateaus, and arid badlands. You’ll traverse three states and two time zones, with elevation changes exceeding 6,000 feet. Plan for 9–11 hours of driving, not counting stops; the route rewards those who linger.

Below is a concise guide to making the most of this journey, with logistics, natural wonders, and practical tips.

Highway surfaces are well-maintained, but watch for wildlife at dawn and dusk, especially in Yellowstone. Speed limits drop in park zones. Cell reception is scarce; carry a physical map.

Family-friendly stops include the Grizzly & Wolf Discovery Center in West Yellowstone, the Buffalo Bill Center of the West in Cody, and Thermopolis’ hot springs water park. These are all wheelchair accessible and have picnic areas.

Pets are allowed in national forests and most pull-offs, but not on Yellowstone trails or in buildings. Many hotels in Cody and Thermopolis are pet-friendly; check policies.

Rest zones appear every 30 miles; notable ones at Madison Junction and Wind River Canyon. Plan for breaks every two hours to combat fatigue; the scenery is distracting.

Hidden gems: the ghost town of Kirwin, accessible via dirt road, and the mineral hot springs at Hot Springs State Park in Thermopolis (free admission).

The fastest route uses I-90 east to Bozeman, then I-94 to Big Timber, and U.S. 191 south through Yellowstone National Park. Alternatively, U.S. 287 from West Yellowstone offers a more direct southern approach. Both routes require a Yellowstone entrance fee ($35 per vehicle) unless you transit during off-hours.

Fuel stops are spaced 60–100 miles apart, with the longest gap between West Yellowstone and Cody (70 miles). Gas prices trend higher near park entrances; fill up in Bozeman or Cody. Cellular coverage is spotty through the park; download offline maps before leaving.

Road conditions are generally good, but mountain passes like Teton Pass (8,431 ft) and Dead Indian Pass (8,077 ft) can close in winter (November–April). Check local advisories for chain requirements.

• Major highways: I-90, I-94, U.S. 191, U.S. 287
• Highest point: Teton Pass (8,431 ft)
• Unique quirk: The highway crosses the Continental Divide three times.

Five distinct landscapes define this route: Idaho’s Clearwater Mountains, Montana’s Paradise Valley, Yellowstone’s geothermal basins, Wyoming’s Absaroka Range, and the Wind River Canyon. Each offers unique photo opportunities, from Shoshone Lake’s thermal pools to the red cliffs of Red Gulch.

Local commerce thrives in small towns like Nye, Montana (home to the famous Grizzly Bar) and Cody, Wyoming (the “Rodeo Capital”). Don’t miss the hot springs at Thermopolis, which are the world’s largest and free to visitors.

For a deeper dive into finding hidden stops, consult how to find the best stops and hidden gems between cities.

Wildlife is abundant: bison, elk, pronghorn, and occasionally grizzly bears. Keep a safe distance and carry bear spray on trails.