Salmon ID to Afton WY Road Trip Guide

The drive from Salmon, Idaho, to Afton, Wyoming, covers approximately 140 miles along US-93 and US-26, crossing the Continental Divide twice. This is not an interstate journey; it's a two-lane highway adventure through the heart of the Rocky Mountains.

You'll leave the Salmon River Valley, climb over Lost Trail Pass (elevation 7,014 feet), descend into the Bitterroot Valley in Montana, then re-enter Idaho before crossing into Wyoming over Teton Pass (elevation 8,431 feet). The driving time is typically 2.5 to 3 hours without stops, but plan for a full day to enjoy the scenery.

Quick Facts

Fuel stations are sparse along this route, so fill up in Salmon or Missoula before heading out. The only reliable stop is in Leadore, Idaho, at mile marker 34 on US-28 (a 20-mile detour from US-93). Otherwise, plan to refuel in West Yellowstone or Dubois if you extend your drive.

Road conditions are generally good, but sections of US-93 are narrow and twisty, especially over Lost Trail Pass. In winter, chains may be required; always check road reports. Cell service is inconsistent—expect dead zones in mountain passes and river valleys.

For a smoother journey, consider a mid-route stop in Salmon's sister city, Wisdom, Montana, which has basic services like gas and a café. But note that this adds about 40 minutes to your total travel time.

• Highway numbers: US-93 from Salmon to Lost Trail Pass, then US-43/MT-43 to Wisdom, then MT-87 to US-20, then US-26 into Afton.
• Curves and grades: Lost Trail Pass has a 6% grade; Teton Pass has a 10% grade.
• Fuel costs: Typically 10–20% higher in remote towns than in larger cities.

The route includes two mountain passes and several long stretches with no services, so plan rest stops. Driver fatigue is a real risk; use Highway 93's designated rest areas near Chief Joseph Pass and in Swan Valley. For families, the Salmon Valley Zoo in Salmon (open May–September) offers a quick animal encounter. In Afton, the Intermountain Bird Museum has interactive exhibits that entertain kids.

Pet owners will find leash-friendly trails at the Big Hole Battlefield National Historic Site, about 30 minutes from Wisdom. Always carry water for pets, as mountain streams are not safe due to giardia.

Road conditions vary with weather; summer thunderstorms can cause flash floods in canyon areas. Winter driving demands snow tires and emergency gear. The Idaho Transportation Department provides live road cameras for passes.

For budget travelers, camping is available at several national forest sites, such as Bannack State Park near Dillon, at $15 per night.

This route is a showcase of geological diversity: the salmon-colored rhyolite of the Challis Volcanics near Salmon, the granite peaks of the Bitterroot Range, and the karst limestone formations around Afton. The star attraction is the how to find the best stops and hidden gems between cities – use that strategy to uncover gems like the Ghost Ranch petroglyphs near Gibbonsville.

Along the way, you'll pass historic mining towns like Gibbonsville and Cobalt, remnants of the 19th-century gold rush. In Afton, don't miss the world's largest elk antler arch, a landmark built in 1958 with 3,016 antlers.

Local Commerce and Dining

For a meal, stop at the Roadhouse Diner in Leadore, known for its homemade pies, or grab a bison burger at Wild West Café in Dubois. Afton boasts a weekly farmers market during summer, offering local honey and huckleberry products.

Several roadside fruit stands appear in season, selling cherries and peaches grown in the lower elevations near Salmon.