Sheridan to Keystone Road Trip Guide: Best Stops & Hidden Gems

The drive from Sheridan, Wyoming to Keystone, South Dakota covers roughly 240 miles along I-90 and US-16, passing through the dramatic transition from the Bighorn Basin to the Black Hills. This route crosses the 104th meridian west longitude near Buffalo, WY—a historical marker for the US land survey system.

Understanding how to find the best stops and hidden gems between cities is essential, as the region offers neglected ghost towns, fossil sites, and scenic byways. Below is a quick reference for the route.

Fuel and Route Economics

Gas stations are plentiful in Sheridan, Buffalo, Gillette, and Sundance, but sparse between towns. Plan to refuel when your tank reaches half. Diesel and E85 are available at major stations. Gas prices vary; fill up in Wyoming where taxes are lower than South Dakota.

• Sheridan: multiple stations near I-90 exit 25.
• Buffalo: stations at exit 299.
• Gillette: ample options near exits 124 and 126.
• Sundance: limited but adequate.

Climatic Conditions & Route Aesthetics

The climate ranges from semi-arid plains to pine-covered mountains. Summers are hot (80-90°F), winters cold (10-30°F) with possible snow. The best time for this trip is May through October for clear roads and vibrant landscapes.

• Spring: wildflowers, occasional rain.
• Summer: dense greenery, thunderstorms possible.
• Fall: golden aspens, crisp air.
• Winter: stark beauty, but snow can impact Devil's Tower detour.

Infrastructure Safety & Road Quality

I-90 is well-paved and maintained year-round. US-16 from Sundance to Keystone is a two-lane highway with curves; drive cautiously. Wildlife (deer, antelope) crossings are common, especially at dawn/dusk.

1. Check weather before departure, especially in winter.
2. Carry emergency kit: water, blanket, flashlight.
3. Use rest stops: Buffalo Rest Area (mm 294), Gillette Rest Area (mm 130).

Natural Landscapes & Attractions

Leaving Sheridan, the Big Horn Mountains rise to the west. Near Buffalo, take a detour to Lake DeSmet for boating and fishing. Further east, the Powder River Basin stretches flat until the Black Hills appear near Sundance.

• Devil's Tower National Monument: 30-mile detour from Sundance; ancient volcanic neck.
• Black Hills National Forest: ponderosa pines, granite peaks.
• Mount Rushmore near Keystone: iconic presidential sculpture.

Local Commerce & Culture

Buffalo's historic downtown has western stores and the Occidental Saloon. Gillette is a coal-mining hub; visit the Campbell County Rockpile Museum. Sundance's charm includes the Crook County Museum and artisan shops.

• Buy bison jerky and local honey in Buffalo.
• Handcrafted knives and leather at Sundance's traders.
• Native American art in Keystone.

UNESCO World Heritage Sites

The route features one UNESCO site: Devil's Tower (officially a National Monument, listed as a mixed site). It holds sacred value for Northern Plains tribes and is a stunning geological formation.

• Best viewing: from the Tower Trail (1.3 miles).
• Climbing permits required; visitor center open seasonally.

Hidden Off-Route Spots

Venture 15 miles south of Buffalo on I-25 to the Fort Fetterman State Historic Site, a former military post with original buildings. Near Gillette, the distant Pumpkin Buttes are visible—tabletop mountains with hiking. For fossil lovers, the John D. Rockefeller Memorial Parkway is a slight detour.

• Fort Fetterman: interpretive trail, guided tours.
• Hulett's historic main street: 5 miles west of Devil's Tower.

Family and Child Suitability

The route is family-friendly with many stops. Kids enjoy the Wyoming Dinosaur Center in Thermopolis (1 hour south of Sheridan) or the Frontier Prison museum in Buffalo. At Devil's Tower, prairie dog towns entertain younger ones.

• Mount Rushmore: junior ranger program, ice cream.
• Cosmos Mystery Area near Keystone: fun optical illusions.
• Storybook Island in Rapid City: magical playground (30 min from Keystone).

Pet-Friendly Framework

Most attractions allow leashed pets outdoors. National parks require dogs on trails. Rest stops have pet areas. Hotels in Keystone are typically pet-friendly.

• Devil's Tower: pets allowed on most trails.
• Mount Rushmore: pets only in designated areas.
• Recommended stops: Buffalo's Vet Park with dog area.

Culinary Infrastructure

Sheridan offers the Spear-O-Wigwam for bison chili. In Buffalo, the Powder River Café serves homestyle German dishes. Gillette's country kitchen restaurants provide comfort food. Keystone has many family diners like the Powder House Lodge and Carver's Café.

• Breakfast: Busy Bee Café in Sundance.
• Pizza: Pizza Ranch in Gillette.
• Picnic supplies: grocery stores in Buffalo and Sundance.

Fatigue Management & Rest Zones

Drive 2-3 hour segments with planned breaks. Use rest areas every 60-90 minutes. Swap drivers if possible. The scenery changes gradually, keeping alert.

1. Stop at the Powder River (mm 294) for short walk.
2. In Gillette, stretch at the Cam-Plex Park.
3. Devil's Tower area offers seating and shade.
4. Final break at Pactola Lake (15 min before Keystone).