Sun Valley to Midway: Idaho to Utah Road Trip Guide

The drive from Sun Valley, Idaho to Midway, Utah covers approximately 320 miles via US-20, US-26, and I-15, passing through the Snake River Plain and into the Wasatch Mountains. A little-known fact: the route crosses the Great Basin Divide near Malad City, Idaho, where waters flow either to the Pacific or the Great Basin.

Average driving time is about 5.5 hours without stops. But the journey deserves more. This guide answers: is it worth driving Sun Valley, ID to Midway, UT? Absolutely—if you know where to pause. For tips on discovering hidden gems, see how to find the best stops and hidden gems between cities.

Family and Child Suitability

The drive is child-friendly with many distraction points. Stop at the Idaho Potato Museum in Blackfoot (exit 93 on I-15) for potato history and a giant fry. For pet breaks, rest areas along I-15 have dog runs.

• Idaho Potato Museum: Open daily, small fee.
• Lava Hot Springs: Natural hot pools, kid-friendly.
• Crystal Hot Springs: Near Midway, family water park.

Fatigue Management & Rest Zones

Take a break every 2 hours. Official rest areas at mile markers 36 (US-20 near Carey) and 63 (I-15 north of Brigham City). Hidden gem: the historic town of Thatcher, ID has a quiet park for a picnic.

Hidden Off-Route Spots

Just 10 minutes off the route: the Minnetonka Cave in St. Charles Canyon, ID (guided tours June-Sept). Another: the Paris Ice Cave in Paris, ID, a natural refrigerator.

Natural Landscapes

The route transitions from the Sawtooth Mountains to the flat Snake River Plain, then rises into the Wasatch Range. Key views: the Craters of the Moon lava fields (visible from US-20) and the Bear River Range near the Utah border.

• Craters of the Moon National Monument: Lunar-like landscape, short hikes.
• Bear Lake: Turquoise water, just east of the route.
• Wasatch Mountain State Park: Near Midway, with scenic drives.

Local Commerce and Culture

Small towns like Soda Springs and Montpelier offer local history. Soda Springs has a geyser that erupts every hour. In Utah, Brigham City has a Historic District with peach orchards.

• Soda Springs: Geyser Park, free attraction.
• Montpelier: Historic Bear Lake County Courthouse.
• Brigham City: Box Elder Tabernacle, peach stands.

Fuel and Route Economics

Gas stations are plentiful along I-15 but sparse on US-20 through Idaho. Fill up in Sun Valley or Hailey before heading east. Expect prices around $3.50/gallon in Idaho, slightly lower in Utah.

• Sun Valley: Chevron at 100 N Main St
• Pocatello: Multiple stations off I-15 exit 67
• Brigham City: Costco and Shell near I-15 exit 362

Road Quality

US-20 is a two-lane highway in good condition, but watch for deer at dawn/dusk. I-15 is well-paved with frequent rest areas. Snow removal is efficient in winter.