Thermopolis to Green River: A Wyoming Road Trip Guide

Your journey begins in Thermopolis, home to the world's largest mineral hot spring, and ends in Green River, a historic railroad town. Covering roughly 250 miles, the drive typically takes 4–5 hours without extended stops. The route follows US-20 west then US-26/US-287 south, crossing the Wind River Canyon and the vast Wyoming Basin.

This is a classic Western road trip through stark beauty and frontier history. The landscape transitions from red desert cliffs to alpine peaks, then to the high desert sagebrush of the Red Desert. Plan for sparse services—fill up when you can. The route offers a genuine taste of Wyoming's vastness.

Traveling from Thermopolis to Green River, WY, you'll follow US-20 west to Shoshoni, then US-26 south to Riverton. From Riverton, continue on US-287 south through Lander and then take WY-28 southwest to Farson. At Farson, turn onto US-191 south to reach Green River. Fuel is available in Thermopolis, Shoshoni, Riverton, Lander, Farson, and Green River, but distances between towns can be long—plan ahead.

• Distances: Thermopolis to Riverton: 30 mi; Riverton to Lander: 25 mi; Lander to Farson: 70 mi; Farson to Green River: 60 mi.
• Exact drive time: 4-5 hours depending on stops; the route is 250 miles total.
• Road conditions are generally good, with two-lane highways and occasional wildlife crossings; winter weather can cause closures.

For family travel, restrooms are available at gas stations and some rest areas. Pet-friendly stops include the Wind River Canyon rest area and the Farson Mercantile, which has a dog-friendly patio. The route is suitable for children, with opportunities to stretch legs at natural landmarks and small-town parks.

The Wind River Canyon, just south of Thermopolis, is a narrow gorge with towering walls and the Wind River running alongside—a highlight for geology enthusiasts. Further south, the route passes near the Wind River Range's eastern slopes, offering stunning mountain vistas near Lander. The Red Desert, between Lander and Farson, is a high-altitude desert with unique badlands formations and was used as a stagecoach route.

In Lander, you'll find the Museum of the American West, which celebrates pioneer life. Farson is famous for its mercantile and ice cream, a local institution. Green River's historic downtown features the Sweetwater County Museum, housed in a former railroad depot. The region's culture is deeply tied to ranching, mining, and the railroad—look for art galleries and rodeo events in summer.

The area includes the Fossil Butte National Monument, a unit of the National Park System, located near Kemmerer, about 90 miles from Farson. While not part of the UNESCO World Heritage Sites list, it offers a glimpse into ancient lake ecosystems. The drive itself passes through rugged beauty—you'll encounter red rock canyons, vast sagebrush plains, and distant mountain ranges.

For more ideas on discovering hidden gems along the way, check out how to find the best stops and hidden gems between cities.

Highway conditions are typical for rural Wyoming: two lanes, moderate traffic, and occasional gravel sections. Watch for deer and antelope, especially at dawn and dusk. Cell service is intermittent—download maps and inform someone of your route. In winter, carry chains and check road alerts; summer brings thunderstorms with hail.

For fatigue, plan to take breaks at designated rest areas: one near Thermopolis, one at the Wind River Canyon overlook, and one near Farson. The Farson Mercantile is a good spot to stretch, have a snack, and refuel.

Best stops between Thermopolis and Green River include the Wind River Canyon, the town of Lander with its hiking trails, and the Red Desert's scenic overlooks. The drive is worth it for those who appreciate vast, unspoiled landscapes and authentic Western towns. Things to do include soaking in Hot Springs State Park in Thermopolis, hiking in Sinks Canyon State Park near Lander, and visiting the Green River's riverfront trails.

Some hidden off-route spots: the historic ghost town of Miner's Delight near Lander, and the Killpecker Sand Dunes south of Farson—the largest active dune field in North America. For families, the Wyoming Dinosaur Center in Thermopolis is a hit, and the Green River's Expedition Island is a historic park. Pets are welcome in most outdoor areas; keep them leashed.