Cedar City to Thermopolis Road Trip Guide: Scenic Utah-Wyoming Drive

This route from Cedar City, UT to Thermopolis, WY covers approximately 450 miles, primarily via I-15 N and US-26 W, taking about 7 hours of pure driving time. A little-known fact: just south of Thermopolis, the road crosses the Owl Creek Mountains, which contain some of the oldest exposed rocks in Wyoming, dating back over 2.8 billion years. This trip traverses three distinct geological provinces: the Basin and Range, the Colorado Plateau, and the Wyoming Basin.

The stretch from Cedar City to Salt Lake City is mostly interstate, but once you turn east towards Thermopolis, you'll encounter rolling plains and dramatic canyonlands. For those wondering how to find the best stops and hidden gems between cities, this guide highlights both obvious and off-the-beaten-path attractions.

The primary route is I-15 North from Cedar City to just north of Salt Lake City, then US-89 North to US-26 East near Sage Junction, Wyoming. An alternative is to take I-80 East from Salt Lake City to Rock Springs and then US-191 North to Thermopolis, which adds about 30 minutes but offers more services.

• Estimated total driving time: 7-8 hours without stops.
• Best stops Cedar City, UT to Thermopolis, WY include Fillmore, Provo, Salt Lake City, Evanston, Rock Springs, and Riverton.
• How long to drive Cedar City, UT to Thermopolis, WY? Typically 7-8 hours, but plan for 10+ with breaks and sightseeing.
• Is it worth driving Cedar City, UT to Thermopolis, WY? Absolutely, for the varied landscapes and hot springs at the destination.

Fuel stations are plentiful along I-15 and I-80, but become sparse on US-26 between Riverton and Thermopolis. Fill up in Riverton (gas station at the junction of US-26 and WY-789). Average fuel cost for the trip: about $50-60 for a typical car (30 mpg, $3.50/gal). Toll roads: none.

Road quality is excellent on interstates, but US-26 east of Riverton has some rough patches and occasional wildlife crossings (deer, antelope). Winter driving can be hazardous due to snow and ice between October and April. Summer thunderstorms cause sudden downpours and hail.

Family and child suitability: This route is very family-friendly. Highlights include the Loveland Living Planet Aquarium in Draper (south of Salt Lake City) and the Wyoming Dinosaur Center in Thermopolis. Many rest stops have playgrounds.

• Pet-friendly framework: Most national forests allow pets on leashes. Rest stops along I-15 have pet areas. Hotels in Thermopolis like the Best Western Plaza Inn are pet-friendly.
• Fatigue management: Plan stops every 2 hours. Good break points at Fillmore (mile 0), Provo (mile 200), Salt Lake City (mile 250), Evanston (mile 330), and Rock Springs (mile 400).

Hidden off-route spots: The ghost town of Sego, UT (abandoned coal mining town) near the junction of I-70 and US-6; and the hot springs at Thermopolis itself, like the Big Spring at Hot Springs State Park, which is free to soak in.

From Cedar City, you'll drive through the red rock canyons of southern Utah near Zion National Park (a short detour), then past the Great Salt Lake. The landscapes shift from arid desert to alpine forests near Provo, then to the high plains of Wyoming. Near Thermopolis, the scenery becomes rugged with the Big Horn Mountains on the horizon.

UNESCO World Heritage Sites along the route include the nearby Zion National Park (about 1 hour south of Cedar City) and the Dinosaur National Monument (slightly off-route, near Vernal, UT). Both offers exceptional geological and natural history.

• Things to do between Cedar City, UT and Thermopolis, WY: visit the Great Basin Museum in Delta, hike the Timpanogos Cave National Monument (near Provo), explore the Utah Olympic Park in Park City (detour), and stop at the Fossil Butte National Monument near Kemmerer, WY.
• Culinary infrastructure: expect chain restaurants along interstates, but local gems include the Coffee Shop in Fillmore, the Mediterranean Market & Deli in Provo, and the Cowfish in Riverton for bison burgers.