Deadwood to Cody Road Trip Guide: Route 16 & I-90

When driving from Deadwood, South Dakota to Cody, Wyoming, you traverse 380 miles of the American West along I-90, US-85, and US-16A/US-14. The fastest route takes about 6.5 hours of pure driving, but the road deserves days of exploration. Notably, the route passes within 10 miles of the Devils Tower National Monument, the first US National Monument, established in 1906 by Theodore Roosevelt.

• Total distance: 380 miles (612 km)
• Driving time: 6.5 hours without stops
• Recommended duration: 2–4 days
• Key highways: I-90, US-85, US-16A, US-14

Understanding how to find the best stops and hidden gems between cities is essential for a memorable journey. For deeper insights, read how to find the best stops and hidden gems between cities.

Infrastructure Safety & Road Quality

I-90 is four-lane divided with clear signage. US-85 and US-14 are two-lane; passing zones are marked. Use headlights at all times in inclement weather. Emergency services available in Newcastle, Buffalo, and Cody via 911. Medical: Major hospital in Cody (West Park Hospital) and Buffalo (Johnson County Healthcare).

• Roadside assistance: AAA coverage adequate; cell service in valleys limited.

Family and Child Suitability

Devils Tower has a 1.3-mile Tower Trail (easy). Buffalo has a free community park and library. Cody offers the Cody Trolley Tours and the Old Trail Town (historic buildings). Children love feeding the fish at the Cody Fish Hatchery.

• Best for kids: Devils Tower junior ranger program, Cody Night Rodeo
• Rest stops with playgrounds: I-90 rest areas near Moorcroft (mile 135)

Pet-Friendly Framework

Pets are allowed at Devils Tower on leash (not inside visitor center). Most hotels in Buffalo and Cody accept pets (Hampton Inn, Super 8). Rest stops have pet relief areas. Avoid trails with wildlife; keep dog secured.

• Pet-friendly dining: The Painted Buffalo (Cody) has outdoor seating.
• Veterinarian: Buffalo Veterinary Clinic (307-684-2211), Cody Vet Clinic (307-587-2233).

Fatigue Management & Rest Zones

Take breaks every 2 hours. Recommended stops: Devils Tower visitor center (restrooms), Lusk rest area (I-90 east of Newcastle), and Bighorn National Forest scenic pullouts. For overnight: Buffalo (several motels) or Greybull (budget options). Avoid driving after dark due to wildlife.

• Destinations: Deadwood to Devils Tower (1.5 hours), then to Buffalo (2 hours), then to Cody (3 hours).

Hidden Off-Route Spots

Just 20 miles north of Newcastle is the Black Hills Caverns (guided tours). Near Buffalo, visit the Hole-in-the-Wall country (outlaw hideout) via unpaved roads. East of Cody, take the Chief Joseph Scenic Byway (Wyoming Highway 296) for stunning views of the Absaroka Range.

• Off-route: Vore Buffalo Jump (archaeological site near Sundance)
• Spur: Medicine Wheel/Medicine Mountain (US-14A, 84 miles from Cody)

Natural Landscapes & Attractions

The route offers three distinct geographic zones: Black Hills granite, Great Plains grasslands, and Bighorn Mountain alpine. Devils Tower rises 867 feet from the plains, a sacred site to Northern Plains tribes. The Bighorn Scenic Byway (US-14) climbs to Powder River Pass with panoramic views. Near Cody, the Shoshone River canyon cuts through volcanic rock.

• Must-see: Devils Tower National Monument (entry $25/vehicle)
• Hidden gem: Shell Falls (US-14, 4 miles west of Shell)
• Photo op: Bighorn Scenic Byway viewpoint at mile marker 49

UNESCO World Heritage Sites

The route does not directly pass UNESCO sites, but deviating 50 miles north to Pompeys Pillar National Monument (near Billings) features a signature from Lewis and Clark. Yellowstone National Park (UNESCO) is 50 miles west of Cody via US-14/16/20.

Climatic Conditions & Route Aesthetics

Summer (June–Aug): 70–90°F, afternoon thunderstorms. Fall (Sep–Oct): crisp, 40–70°F, golden aspens. Winter (Nov–Mar): 0–30°F, snow possible. Spring (Apr–May): 30–60°F, rain and mud. Best aesthetics: early October for fall colors; July for wildflowers in Bighorns.

Local Commerce & Culture

Deadwood is a living history town with casinos and Gold Rush architecture. Buffalo has the Occidental Hotel, frequented by Calamity Jane. Cody embraces Western heritage with nightly rodeos (summer) and the Buffalo Bill Center of the West.

• Deadwood: Main Street gambling, historic walking tours
• Buffalo: Jim Gatchell Museum (Native American artifacts)
• Cody: Buffalo Bill's Irma Hotel, historic firearm exhibits

Fuel and Route Economics

Gas stations are plentiful along I-90 but sparse on US-85 between Lusk and Newcastle. Plan refueling in Deadwood (multiple stations), Newcastle (Chevron, Exxon), and Buffalo (Kum & Go). In Cody, fuel prices average $3.50/gallon (2025 est.), slightly higher than Black Hills region.

• Deadwood: average $3.30/gal
• Newcastle: $3.45/gal
• Buffalo: $3.40/gal
• Cody: $3.50/gal

Road Quality and Safety

I-90 is well-maintained, four-lane divided highway. US-85 from Newcastle to Buffalo is two-lane with moderate traffic; watch for livestock. US-14 from Greybull to Cody winds through Shell Canyon with narrow shoulders and sudden curves. Winter driving (Nov–Mar) requires chains or snow tires, especially over Powder River Pass (el. 9,666 ft). Summer thunderstorms reduce visibility.

• Major hazards: wildlife (deer, elk) at dawn/dusk, gravel trucks, sudden weather shifts
• Cell coverage: AT&T and Verizon generally reliable except in Shell Canyon and Bighorn National Forest.