Rapid City SD to Kemmerer WY: Epic Road Trip Guide

The 540-mile journey from Rapid City, SD to Kemmerer, WY via I-90 W and US-16/US-20 cuts through the heart of the American West. This route passes the geographic center of the contiguous US near Belle Fourche (44°18'N, 103°50'W) and crosses the Continental Divide at 7,500 feet. The drive takes approximately 8-9 hours without stops, but you'll want to linger.

Infrastructure Safety & Road Quality

Interstate sections are well-maintained; US highways have narrow shoulders and occasional gravel. Expect livestock crossings. Cell service is spotty west of Rawlins; download offline maps.

• Emergency call boxes every 2 miles on I-90
• Gas stations every 30-50 miles on main routes
• Watch for deer, antelope, and cows at night

Family and Child Suitability

Devils Tower offers junior ranger programs. The Wyoming Frontier Prison in Rawlins has interactive tours. Kemmerer's Fossil Butte includes hands-on fossil digging for kids (fees apply).

• Stop at Dairy Queen in Moorcroft for treats
• Rest stops with playgrounds: Buffalo, Rawlins
• Pet-friendly framework: Most motels in Casper allow pets; leash laws in national parks

Hidden Off-Route Spots

Vore Buffalo Jump (exit 180 on I-90) is a natural buffalo kill site turned archaeological dig. A 10-mile detour to Alcova Lake offers swimming and camping. Near Kemmerer, the fossil lakes at Kemmerer Sahara non-profit site allow amateur collection.

Fatigue Management & Rest Zones

Plan 15-minute breaks every 2 hours. Rest areas near Pine Haven (mile 23) and Elk Mountain (mile 230) have picnic tables. Ideal overnight stops: Buffalo (halfway point) or Rawlins.

Fuel up in Rapid City at average $3.50/gal; prices rise as you go west. The last affordable fuel before the Wyoming border is in Moorcroft, WY (exit 153). Plan fuel stops every 150 miles.

• Total distance: 540 miles
• Estimated driving time: 8-9 hours
• Recommended stops: Devils Tower, Buffalo, Casper, Rawlins
• Road conditions: Generally good, but watch for wildlife at dawn/dusk

For the best stops between these cities, check out how to find the best stops and hidden gems between cities.

Natural Landscapes & Attractions

The route traverses the Black Hills, high plains, and Red Desert. Devils Tower National Monument (first US National Monument, 1906) rises 867 feet from the prairie. Hell's Half Acre near Casper is a 500-foot-deep geological oddity shaped like a miniature Grand Canyon.

• Devils Tower: Climbing routes, prairie dog towns
• Hell's Half Acre: Overlook, photo ops
• Red Desert: Wild horses, badlands formations

UNESCO World Heritage Sites

The route passes near one UNESCO site: The sacred Native American landscape of Bear Butte (within Black Hills). While not directly on the highway, a short detour to Custer State Park offers bison herds and Needles Highway.

Climatic Conditions & Route Aesthetics

Summer temps range 70-90°F; winter can drop below 0°F with snow. The Red Desert in May-June has wildflowers; fall colors in the Black Hills peak late September. Always carry chains in winter.

Culinary Infrastructure

Try buffalo burgers in Rapid City, Wyoming bison chili in Rawlins, and the famous Basin Oil Bar in Kemmerer for classic steak. Gas station snacks are reliable but seek local diners for comfort.

Local Commerce & Culture

Buffalo's western heritage includes the Occidental Hotel bar. Kemmerer's Fossil Butte National Monument offers leaf-fossil souvenirs. Small towns like Sundance have artisan shops.