Sun Valley to Kanarraville: Ultimate Road Trip Guide

Driving from Sun Valley to Kanarraville means transecting the Great Basin and the edge of the Colorado Plateau. The route covers approximately 450 miles, mostly via US-20, I-84, and I-15, taking roughly 7 hours without stops. Yet few drives reveal such a dramatic transition: from the Sawtooth Mountains' granitic spires to the rust-red Navajo Sandstone of southern Utah.

A striking historical fact: the Union Pacific's Oregon Short Line Railroad once paralleled much of this corridor, carrying silver from Idaho's mines to the smelters of Utah. Today, the road mirrors those iron rails, offering a modern passage through a landscape shaped by volcanism and ancient seas.

• Key highways: US-20 east to I-84 southeast, then I-15 south near Tremonton.
• Approximate drive time: 7 hours, but plan for 9–10 with stops.
• Elevation ranges from 5,900 ft in Sun Valley to 3,600 ft in Kanarraville.

Fuel stops are plentiful along I-84 and I-15, but sparse in the high desert between Sun Valley and Twin Falls. Fill up in Sun Valley (gas stations at the junction of ID-75 and US-20) and again in Twin Falls or Tremonton. Expect gas prices to be $0.10–0.20 higher in resort towns like Sun Valley.

• Best fuel economy: cruise at 65 mph on two-lane US-20; on I-15, 70 mph optimizes mileage.
• Diesel available at most major stations; RV propane at Flying J in Tremonton.

Road quality: US-20 is well-maintained two-lane highway with occasional passing lanes. I-84 and I-15 are smooth interstates. Construction zones near Brigham City and Maeser in Utah may cause 10-15 min delays. Check UDOT traffic alerts before departure.

• Winter travel: snow tires or chains required ID-20 above 5,000 ft Nov–Mar.
• Summer: bring extra water in desert stretches; no services for 60 miles between Arco and Idaho Falls (alternate route).

Safety on this route is generally high: the interstates are well-lit and patrolled. Hazards include wildlife (deer, elk) at dawn/dusk on US-20, and sudden crosswinds on I-15 near the Great Salt Lake. Keep headlights on all day in the desert to increase visibility.

• Emergency pull-offs: every 2 miles on I-84, fewer on US-20 – plan rest stops at Shoshone (minimal services) or Burley (gas and cafes).
• Cell coverage: AT&T and Verizon work on most of I-15; US-20 has dead zones near Arco.

Family suitability: many kid-friendly stops. The Idaho Potato Museum in Blackfoot (exit 93 off I-15) is a quirky 30-minute break. In Utah, the Dinosaur Museum in Blanding is off-route but worth the detour for young travelers. Pet-friendly: most rest areas have dog runs; hotels in Twin Falls and Tremonton accept pets ($20-30 fee).

• Fatigue management: stop every 2 hours. Recommended rest zones: Jerome County Rest Area (US-20 mile 120), Portage Rest Area (I-15 mile 370).
• Hidden off-route spot: City of Rocks National Reserve (west of I-84 near Burley) – a climbers' paradise with granite spires and pioneer graffiti from the California Trail.

The first landscape after Sun Valley is the Snake River Plain, a volcanic flood basalt expanse dotted with cinder cones. Near Kimberly, you'll glimpse the Snake River Canyon – deeper than the Grand Canyon in places, though not as wide. The Perrine Bridge spans this chasm at Twin Falls.

• Best viewpoint: Centennial Waterfront Park, Twin Falls (free, easy off I-84).
• Hidden gem: Balanced Rock, a 48-foot monolith just south of Buhl on ID-46.

Entering Utah, the landscape transforms into the Wasatch Range foothills. Box Elder County offers pioneer heritage sites like the Golden Spike National Historical Park (off I-15 near Corinne). The final leg descends through the Hurricane Fault zone into the Kolob Canyons area, a section of Zion National Park.

• UNESCO World Heritage Site: Zion National Park's Kolob Canyons section is a short detour (12 miles west of Kanarraville).
• Local commerce: Kanarraville's general store sells souvenir kanele (native grass baskets) – a unique Utah craft.