Green River to Custer: A Road Trip Guide

Starting in Green River, Utah, at the junction of I-70 and US-191, this route east to Custer, South Dakota, takes you through the heart of the American West, crossing the Colorado Plateau and the Great Plains.

The drive spans approximately 554 miles, typically taking 8-9 hours of pure driving time, but with stops, plan for at least two days to fully appreciate the landscapes.

One of the first notable facts: this journey crosses the Continental Divide at two points, and it passes near the historic 1860s Overland Trail, a key stagecoach route.

Start on US-191 north from Green River, then connect to I-80 east at Rock Springs, Wyoming. From there, take US-85 north and US-16 east into South Dakota.

Fuel prices vary significantly; as of 2023, gas averages $3.50/gal in Utah, $3.20 in Wyoming, and $3.40 in South Dakota, with remote stretches having higher prices.

• Best stops Green River, UT to Custer, SD: include Flaming Gorge, Devils Tower, and the Badlands.
• How long to drive Green River, UT to Custer, SD: approximately 8-9 hours without stops.

The roads are well-maintained, but be prepared for wildlife crossings, especially in Wyoming at dusk and dawn. Always carry water and emergency supplies, as services can be 100 miles apart.

Weather can change rapidly; check forecasts for snow in Wyoming montane passes even in summer. For families, the route offers several kid-friendly stops.

• Things to do between Green River, UT and Custer, SD: visit the Flaming Gorge dam visitor center, the Buffalo Bill Center of the West in Cody (if extended), and the Mammoth Site in Hot Springs, SD.
• Pet-friendly: many national parks allow pets on trails, but keep them leashed. In Custer State Park, pets are allowed in campgrounds but not on some trails.

Fatigue management: plan stops at Rock Springs (WY) and Newcastle (WY) for rest and fuel. The route is part of the US-16 and I-80 corridors, with ample rest areas every 50-60 miles.

Hidden off-route spots: consider a side trip to the Hot Springs' Mammoth Site, an active paleontological dig with ancient bones, and the Thoen Stone discovery site near Lusk.

The route transitions from the red rock canyons of Utah to the high desert of Wyoming and finally the Black Hills of South Dakota. Key natural attractions include Flaming Gorge National Recreation Area (UT/WY) and, with a short detour, the iconic Devils Tower (WY).

Is it worth driving Green River, UT to Custer, SD? Absolutely, for the geological diversity alone, including the Badlands National Park in South Dakota.

Local commerce along the route is sparse but genuine. In Green River, stop at the John Wesley Powell River History Museum to learn about the explorer. Small towns like Lusk, WY, offer classic roadside diners, and Hill City, SD, provides galleries and a historic 1880 train.

For planning tips on discovering hidden gems, see how to find the best stops and hidden gems between cities.