West Yellowstone to Gillette Road Trip Guide

The route from West Yellowstone, MT to Gillette, WY traces the edge of the Yellowstone Caldera, one of the largest active volcanic systems on Earth, which last erupted 640,000 years ago. As you leave West Yellowstone, you pass through the Hebgen Lake fault scarps, remnants of the 1959 M7.3 earthquake that reshaped the landscape and created Quake Lake.

Driving east on US-20/US-14/US-16, you'll cross the Continental Divide three times, each crossing marked by subtle shifts in watershed drainage. The road eventually descends into the Bighorn Basin, passing through Cody, WY, then climbs over the Bighorn Mountains via US-16 Alternate (Powder River Pass at 9,666 ft), before leveling out onto the Great Plains near Buffalo and continuing to Gillette. The entire distance is approximately 430 miles, typically taking 7 to 8 hours of driving time without stops.

The landscape transitions from volcanic plateaus to river canyons, to pine forests, to high desert plains. Between West Yellowstone and Cody, the road follows the North Fork of the Shoshone River, offering sweeping views of the Absaroka Range. In Cody, the Buffalo Bill Center of the West (five museums) provides a deep dive into the region's history, including indigenous cultures and the Western frontier era.

Continuing east, the Bighorn Basin is rich in fossil beds; near Greybull, you can visit the Washakie Museum to see dinosaur exhibits. The climb over the Bighorns reveals alpine meadows and chance sightings of moose and deer. After descending to Buffalo, the landscape opens into rolling grasslands, with the Thunder Basin National Grassland just south of Gillette, a home to pronghorn antelope and prairie dogs.

Local commerce reflects the ranching heritage: small-town diners serve chicken-fried steak, and roadside stands sell local honey. In Buffalo, the Occidental Hotel on Main Street is a restored landmark where you can grab lunch. Cody hosts a nightly rodeo in summer, a slice of Western culture that thrills visitors. For a unique artifact, stop in Ten Sleep to see petroglyphs at the nearby Medicine Lodge State Archaeological Site (a short detour, well worth it).

Fuel stops are plentiful along I-90 from Buffalo to Gillette, but sparse between West Yellowstone and Cody, especially in winter. Plan to fill up in West Yellowstone, then again in Cody (where gas is typically cheaper) to avoid empty stretches through the Shoshone National Forest. The route features several mountain passes that may close during severe weather; check Wyoming Department of Transportation (WYDOT) road reports before departure.

• Driving time estimate: 7.5 hours (without stops).
• Road quality: Primarily two-lane highways through mountainous terrain, with guardrails in steep sections; I-90 is four-lane divided.
• Weather closures: US-14/16 Alt over the Bighorns can close in winter; check WYDOT.

All towns along the route offer basic services; the largest is Cody with a Walmart Supercenter and several full-service hotels. Buffalo and Gillette both have national chain restaurants and fast-food outlets. For those traveling with a trailer, be aware of steep grades and sharp curves on US-14/16 Alt; some sections have 6% to 7% grades.

Road safety on this route is generally high, with well-maintained asphalt and adequate signage. Watch for wildlife, especially deer and elk, which are active at dawn and dusk; use high beams when possible. Speed limits are 70 mph on interstates and 55-65 mph on two-lane highways; enforce safe following distances. In winter, carry chains and emergency supplies as mountain passes can become icy.

For families, the route offers multiple opportunities to stretch skinny legs: Yellowstone National Park's East Entrance is just an hour from West Yellowstone, but you'll need to pay the $35 park entrance fee if you plan to enter. Just outside Cody, the Buffalo Bill Dam Visitor Center provides a kid-friendly view of the reservoir. The Bighorn National Forest has several picnic areas and short nature trails, such as the Kane Area near Shell. In Gillette, kids will enjoy the Gillette Frontier Auto Museum, which includes antique cars and interactive exhibits.

Fatigue management is crucial on this long drive. Plan to stop every two hours or 100 miles. Notable rest areas include: the Yellowstone West Entrance plaza (with toilets and picnic tables), the Cody Visitor Center (indoor restrooms), the Powder River Pass rest area (scenic overlook), and the I-90 rest area near Buffalo (with 24-hour facilities). If you need a longer break, each town has a coffee shop; try a local roaster in Cody or grab an energy drink at a gas station. For overnight stays, consider Cody or Buffalo, both offer comfortable motels.