Salt Lake City to Thermopolis Road Trip: Ultimate Guide

This route follows US-89 and US-30 through the Wasatch Range and into Wyoming's high desert. The drive covers 250 miles (402 km) and typically takes 4 hours without stops. A little-known fact: the road crosses the Bear River five times, following a historic Native American trail used by Shoshone tribes.

The journey transforms from Utah's Great Salt Lake wetlands to Wyoming's Bighorn Basin badlands. Elevations range from 4,200 feet at Salt Lake City to 6,860 feet at the Utah-Wyoming border. The route offers surprising geological diversity.

This guide answers: best stops Salt Lake City to Thermopolis, how long to drive, is it worth driving, and things to do between. For more on spotting hidden gems, see how to find the best stops and hidden gems between cities.

The journey crosses three distinct eco-regions: the Wasatch Front's sagebrush steppe, the Uinta Mountains' alpine forests, and the Bighorn Basin's badlands. Near the Utah-Wyoming border, the Bear River meanders through lush meadows.

• Must-see: Woodruff Narrows Reservoir (mile 60) for waterfowl and fishing.
• UNESCO site: Not on route, but nearby Dinosaur National Monument (1.5h detour) is a World Heritage candidate.
• Local commerce: Fossil Butte National Monument (mile 75) has a visitor center with fossil exhibits; admission $10.

Evanston's historic downtown has antique shops and the Bear River State Park. In Kemmerer, the JC Penney Mother Store (original 1902) offers nostalgia. Farson is famous for Farson Mercantile's house-baked pies.

• Best pie: Farson Mercantile's sour cream raisin, $4.50 a slice.
• Local art: Evanston's Uinta County Fine Arts Council gallery.

US-89 and US-30 are well-maintained two-lane highways with occasional passing lanes. Gas stations are sparse between Evanston and Kemmerer, so fill up in Evanston (milemarker 5). Diesel is available at major towns.

• Estimated fuel cost: $35-45 for a standard sedan (3.5 gallons at $3.50-4.00/gal in Utah, slightly higher in Wyoming).
• Road tolls: None. All roads are public.
• Restrooms: Clean facilities at rest areas near Evanston (mile 10) and Kemmerer (mile 70).

Cell service: Strong in Utah; spotty in Wyoming between Kemmerer and Farson. Verizon has best coverage. Download offline maps.

Weather closures: Rare but possible in winter (November-March) due to snow. Check WYDOT road conditions. Summer flash floods can occur in washes.

• Best driving months: May-October for clear roads and wildflowers.
• Worst driving months: December-February for icy conditions.

The road is straight and relatively flat, reducing fatigue, but watch for wildlife (deer, pronghorn) at dawn/dusk. Speed limits drop in towns: 35 mph in Evanston, 25 in Kemmerer.

• Safety: No major hazards, but to avoid drowsiness, stop every 2 hours. Rest areas at mile 10 (Evanston) and mile 70 (Kemmerer) have picnic tables.
• Family-friendly: Fossil Butte National Monument (mile 75) has interactive exhibits and junior ranger program. Children love the fossil digging simulation.
• Pet-friendly: Petroglyph Canyon in Kemmerer (1h stop) allows dogs on trails, and the Farson Mercantile has outdoor seating for pets.

Hidden off-route spot: Approximately 15 miles south of Farson on WY-191 is the White Mountain Petroglyph Site (free, 30-minute walk). It features ancient Shoshone rock art from 1000 AD.

Fatigue management: Avoid driving straight through. Plan a meal stop at the Kemmerer Dairy Queen (ice cream) or Farson Mercantile (pie and coffee).

• Best rest stop: Evanston's Bear River State Park (mile 5) has clean restrooms and short walking trails along the river.
• Local commerce: The Farson Mercantile also sells locally made jams and jerky, perfect for road snacks.