Lava Hot Springs to Thermopolis: A Scenic Idaho-Wyoming Road Trip

The route from Lava Hot Springs, Idaho to Thermopolis, Wyoming traverses the Snake River Plain and crosses the Continental Divide at Teton Pass (elevation 8,431 feet). This drive treats you to geothermal wonders, vast plains, and mountain vistas—all within about 6.5 hours of driving, covering roughly 350 miles. The journey begins in Idaho's southeast corner, where the Portneuf River meets geothermal springs, and ends in Wyoming's Bighorn Basin, home to the world's largest mineral hot spring.

Here's a quick overview of the trip:

For families, the route offers plenty of safe, engaging stops. The Museum of the Mountain Man in Pinedale provides an interactive look at frontier history, while the National Museum of Wildlife Art in Jackson boasts child-friendly exhibits. Plan for rest breaks every 2 hours; well-marked rest areas are available near Idaho Falls, Alpine, and Dubois.

Pet owners will find most rest areas and national forest lands welcome leashed pets, but note that Hot Springs State Park's bathhouse does not allow animals. To manage fatigue, consider an overnight stay at Jackson or Dubois—both offer a range of accommodations from budget motels to historic lodges. Use how to find the best stops and hidden gems between cities for curated suggestions.

This trip uses I-15 north from Lava Hot Springs to Idaho Falls, then US-26 east through Swan Valley to Jackson, WY, crossing Teton Pass (WY-22), then US-191 south to Hoback Junction, and US-189/191 through Pinedale and Dubois to Thermopolis. Fuel is readily available in Idaho Falls, Jackson, Pinedale, and Dubois, with stretches of 60-80 miles between stations in rural Wyoming. Plan for higher gas prices in Jackson (often $0.20-0.50 more per gallon) than in Idaho Falls or Dubois.

Road conditions are generally excellent, with well-maintained asphalt and clear signage. Winter travel can be hazardous, especially over Teton Pass, which is subject to sudden snowstorms and chain controls; check road advisories before departure.

Leaving Lava Hot Springs, you'll pass through the Portneuf River Valley, a lush canyon dotted with ranches. Idaho Falls offers a riverside greenbelt and the historic Idaho Falls Temple, a striking example of Mormon architecture. Beyond Idaho Falls, the landscape opens into the Snake River Plain, with the Teton Range rising ahead as you approach Victor, ID. Crossing Teton Pass, you'll descend into Jackson Hole, a valley renowned for its dramatic scenery and bustling tourist town of Jackson.

The region's geothermal activity continues in Wyoming: Hot Springs State Park in Thermopolis features the world's largest mineral hot spring, ensuring a relaxing finale. Local commerce thrives on agriculture and tourism, with roadside stands selling huckleberry products near Island Park and Wyoming's iconic ranch wear in Dubois.