West Yellowstone to Provo: Scenic Road Trip Guide

This route follows US-20 and I-15, a 322-mile journey that descends over 6,000 feet from Yellowstone's high plateau to Utah Valley. The drive passes three states, eight mountain passes, and the Continental Divide twice.

Completed in 1915, the highway was the first to link Yellowstone to the Pacific Northwest, and today it offers a rapid yet scenic passage through some of the West's most iconic landscapes.

Driving time is typically 5.5 to 6.5 hours, depending on snow conditions and heavy summer traffic at the park exit. The fastest route is nearly all highway, but that doesn't mean you'll be immune to wildlife jams or sudden weather shifts.

The entire route is suitable for families, with numerous picnic areas and rest stops in Idaho. Rest areas are spaced roughly every 50 miles, and most have playgrounds and pet areas.

For pet-friendly stops, Idaho Falls has several dog parks, and many motels in rural towns accept pets, but always call ahead.

To manage fatigue, plan to stop every two hours. The most critical stretch is the mountain section between West Yellowstone and Ashton—this is a two-lane road in parts and demanding at night.

For hidden gems, take a short detour to Mesa Falls, a spectacular two-tier waterfall in the Snake River Valley, then continue on to discover the quiet village of Heise with its natural hot springs.

For more tips on discovering hidden stops, read our guide on how to find the best stops and hidden gems between cities.

Fuel costs vary widely; expect prices about 15% higher in resort areas like West Yellowstone, so top up before leaving town. Once you hit Idaho Falls, gas becomes cheaper and more frequent.

The route includes toll-free roads, and for current conditions, call 511 in both Montana and Idaho.

• The road is well-maintained year-round, but be prepared for snowplows between November and April.
• Mountain passes require chains or all-wheel drive during winter storms.
• Cell coverage is strong after Idaho Falls, but spotty in the mountains.
• There are no tolls on this route.

Leaving West Yellowstone, the Madison River runs alongside you, popular for fly fishing. Further south, the Caribou-Targhee National Forest offers volcanic geological features like the Craters of the Moon, a UNESCO World Heritage Site candidate.

In Idaho Falls, the river walk is a local family favorite, and the Bengal Drive-In is a quick stop for burgers and shakes.

Beyond the natural scenery, the route passes through small towns where you can find local shops selling huckleberry products and Western wear. The diversity of landscapes—from pine forests to volcanic plains to farmland—keeps the drive from ever becoming monotonous.