Rapid City to Pocatello: A Complete Road Trip Guide

The drive from Rapid City, SD to Pocatello, ID covers approximately 660 miles on I-90 and I-15, passing through the Black Hills, the high plains of Wyoming, and the volcanic landscapes of eastern Idaho. This route crosses parts of the Oregon Trail, and near Casper you'll find the National Historic Trails Interpretive Center, which details the journeys of 19th-century emigrants.

Before you hit the road, learn how to find the best stops and hidden gems between cities.

Safety is paramount on this route, which includes high-speed rural highways and potential wildlife crossings. Drive alert between dusk and dawn, especially near the Bighorn National Forest and along the Montana-Idaho border, where deer, elk, and antelope are common. Use high beams where possible and watch for reflective eyes.

• Rest areas: Every 60–70 miles on I-90 in Wyoming and Montana. Notable family-friendly rest stops include the Little Bighorn Battlefield rest area (MT) with visitor center and walking trails.
• Fatigue management: Take a break every 2 hours. Ideal stops with picnic areas: Gillette (WY) City Park, Sheridan (WY) Kendrick Park, and Idaho Falls Greenbelt.
• Pet-friendly framework: Most rest stops have pet areas. For off-leash fun, the Black Hills National Forest near Rapid City has trails. In Pocatello, the Idaho State University Arboretum welcomes leashed dogs.

Family-friendly attractions include the Mammoth Site in Hot Springs (SD) (slightly south of Rapid City), the Buffalo Bill Center of the West in Cody (WY) (off-route but worth a detour), and the Museum of the Rockies in Bozeman (MT). For children, the Idaho Falls Zoo at Tautphaus Park is a hit.

Culinary infrastructure: Try the famous Wall Drug donuts in Wall, SD. In Sheridan, WY, enjoy Wyoming's Best Burger at the Cowboy Cafe. In Butte, MT, the pasty (a meat pie) is a local staple. Idaho Falls has excellent Basque cuisine at the Chateau.

The main artery is I-90 West from Rapid City through Wyoming, then south on I-15 at Butte, Montana, into Idaho. This path avoids mountain passes in winter but still has high elevations. Estimated driving time is 10 hours without stops, but plan for 12–14 hours with breaks.

Traffic is generally light outside of city centers. Construction zones are common in summer; check 511 services for Wyoming, Montana, and Idaho before departing.

• Major fuel stops: Wall (SD), Gillette (WY), Sheridan (WY), Billings (MT), Butte (MT), Idaho Falls (ID). Fuel prices tend to be lower in Montana.
• Road quality: Well-maintained interstates with rest areas every 30–50 miles. Some stretches in Montana have long gaps without services.
• Gas stations and lodging clustered near exit signs; plan ahead for stretches like between Sheridan and Billings.

Hitching or camping along the route is possible but requires permits in national forest areas. Most towns have basic motels and chain hotels.

The journey begins in the Black Hills of South Dakota, a forested uplift of granite and limestone. As you cross into Wyoming, the terrain opens into high plains and rolling grasslands, punctuated by the Bighorn Mountains to the west. Near Buffalo (WY), an off-route detour to the Cloud Peak Skyway offers alpine tundra and glacial lakes (adds 1.5 hours).

• Natural attractions along I-90: Devils Tower National Monument (northeast of Moorcroft, WY), a 1-hour detour; it's a sacred site for Northern Plains tribes and a classic climbing destination.
• In Montana, look for the Pompeys Pillar National Monument (near Billings), a sandstone butte with the only remaining physical evidence of the Lewis and Clark expedition.
• Eastern Idaho is defined by the Snake River Plain, a volcanic basin with lava flows and the scenic Hell's Half Acre Lava Flow (west of Idaho Falls).

Local commerce thrives in small towns like Buffalo (WY), known for its historic Occidental Hotel and cowboy shops. In Dillon (MT), visit the Beaverhead County Museum for pioneer artifacts. Idaho Falls has a vibrant farmer's market in summer and the unique Art Museum of Eastern Idaho.