Afton WY to Lolo MT: Scenic Drive Guide

Running from Afton, Wyoming, at the foot of the Salt River Range, to Lolo, Montana, in the Bitterroot Valley, this 425-mile route climbs into the Caribou-Targhee National Forest before traversing the Snake River Plain and crossing the Continental Divide at Monida Pass (elev. 6,870 ft), the highest point on I-15 between Utah and Montana. The drive typically takes 7 hours without stops, but with scenic overlooks and wildlife delays, plan for 8–9 hours. The table below summarizes key logistics.

Start on US-89 east from Afton, then merge onto US-26 and I-15 north. Near Dubois, ID, you enter the Idaho National Laboratory (INL) site; the highway is closed when the lab conducts hazardous tests, so check the INL hotline. West Yellowstone and the Madison River offer fuel and dining, but between St. Anthony, ID, and Dubois, services are sparse; fill up in Idaho Falls or Rexburg.

• Fuel prices rise 15–20% in small towns like Spencer and Ashton.
• Diesel is available at most major truck stops along I-15.
• Card skimmers at remote pumps are a risk; inspect before using.

I-15 is well-maintained, but beware of roaming livestock and wildlife, especially at dawn. The road is winding near Ashton and on the approach to Lolo; keep speeds moderate. For families, Lava Hot Springs (off-route) is a hit, but the Yellowstone Bear World in Rexburg offers drive-through bear viewing.

Pet-friendly stops include the Gallatin National Forest trailheads near West Yellowstone; always carry water and a leash. To combat fatigue, stop every 2 hours; Interstate rest areas at Dubois and Spencer have picnic tables but no staff. A hidden gem: the Red Rock Lakes National Wildlife Refuge, accessible via a gravel road from Monida, is home to trumpeter swans.

For more tips, see this how to find the best stops and hidden gems between cities.

The route crosses the Snake River Plain, a volcanic basalt region formed by the Yellowstone hotspot; you'll see potato farms and lava fields. As you climb toward Monida Pass, the terrain becomes high-desert sagebrush, then transitions to pine forest near Henrys Lake. The Bitterroot Valley is known for its orchards and timber heritage.

In Afton, don't miss the world's largest elk antler arch (weighing 9 tons) at the entrance to the town park. In Montana, the gas station in Lima has a museum with dinosaur fossils discovered nearby. Local commerce is dominated by ranching and outfitting; you can buy handmade leather goods in Victor.