Keystone to Lolo Road Trip Guide: Scenic Drives & Stops

Leaving Keystone, SD (elevation 5,300 ft), you’re immediately climbing through the granite spires of the Black Hills, home to the iconic Mount Rushmore. The route west follows US-16 to I-90, stretching nearly 900 miles to Lolo, MT, a gateway to the Bitterroot Valley. This drive crosses two time zones, four states, and a dramatic shift from pine forests to high plains to Rocky Mountain passes.

The journey isn’t just a freeway dash; it’s a corridor rich in Western history, geological wonders, and quiet small towns. Whether you’re chasing the summer sun or autumn colors, each stretch offers a distinct flavor. Use this guide to time your trip, budget fuel, and discover unexpected gems along the way.

The landscape unfolds as you leave the Black Hills' ponderosa pines, giving way to the rolling shortgrass prairies of Wyoming. The western horizon is dominated by the Bighorn Mountains, which you skirt near Sheridan, WY. This area is rich in dinosaur fossil beds; the American Fossil Discovery Center in Buffalo, WY, offers a hands-on look.

Crossing into Montana, the terrain transforms into the Yellowstone River Valley, with the Absaroka Range to the south. The Pompeys Pillar National Monument—a towering sandstone rock with William Clark’s 1806 inscription—is a quick detour off I-90 and a UNESCO World Heritage Site candidate. Near Livingston, MT, the Yellowstone River cuts through Paradise Valley, a haven for fly fishers.

Local commerce along the route thrives on tourism and ranching. In Buffalo, WY, the Occidental Hotel has served travelers since 1880 (as a trading post). For a quick bite, head to the Powder River Inn in Gillette, WY, known for its chicken-fried steak. As you approach Lolo, the Bitterroot Valley’s orchards and farms offer seasonal fruit stands and local honey.

Driving from Keystone to Lolo typically takes 12–14 hours of pure wheel time, plus stops. The fastest route is I-90 west through Rapid City, SD, then Buffalo, WY, Billings, MT, and finally Missoula, MT, before taking US-93 south to Lolo. Expect construction delays in summer, especially around Bozeman, MT.

GPS coordinates: Keystone (43.895° N, 103.418° W), Lolo (46.758° N, 114.080° W). Fuel costs average $50–$70 for a mid-size sedan, but prices vary—cheapest gas often in Wyoming, highest in remote Montana stretches. Download offline maps; cell coverage is spotty west of Buffalo, WY.

• Mile marker 72 on I-90: rest area with picnic tables and prairie views.
• Exit 434 in Billings: major fueling station with fast food options.
• Wyoming's speed limit is 80 mph; Montana's is 80 mph on rural interstates.

Road quality is generally good on I-90, but watch for deer and antelope at dawn and dusk. In winter, snow and ice are common, especially over the Continental Divide at Homestake Pass (elevation 6,329 ft) near Butte, MT. Carry chains in your trunk from November to March.

For families, the entire route is kid-friendly, with many attractions and rest areas. In Rapid City, SD, the Reptile Gardens is a dry-weather stop. In Hardin, MT, the Little Bighorn Battlefield National Monument offers a poignant history lesson (National Park Service site). The Yellowstone Art Museum in Billings has interactive exhibits for children.

Pet-friendly infrastructure is solid: most motels along I-90 accept dogs, and there are multiple off-leash parks in Billings, MT (e.g., Phipps Park). Rest stops are spaced every 30–40 miles on I-90, with vending machines and picnic tables. Casualties from fatigue are prevented by planning stops: take a 15-minute break every two hours. The public rest area at Swan Valley, MT, just west of Livingston, has a scenic overlook that’s a perfect stretch point.