McCall to Dubois Road Trip: Idaho Scenic Highway 55 and US-26 Guide

McCall, Idaho sits at 5,000 feet on Payette Lake, carved by Pleistocene glaciers. Dubois, Wyoming lies at 6,900 feet in the Wind River Valley, gateway to the Absaroka Range. The drive between them covers exactly 547 miles via US-95, I-84, US-20, US-26, and WY-26—a route that transitions from Idaho's ponderosa pine forests to Wyoming's high desert sagebrush.

The most efficient time without stops is 8 hours 10 minutes, but you will want to stretch it to two days. The stretch through Craters of the Moon National Monument alone deserves half a day. GPS waypoint 44.0°N, 114.7°W marks the halfway point near Arco, Idaho, where the road crosses ancient lava flows.

Data table: Key segments

Fuel economy: expect 18-25 mpg depending on vehicle. A full tank from McCall (gas at 3.65/gallon) gets you 300 miles. Next reliable fuel is in Boise (98 miles), then Mountain Home (40 miles), Arco (140 miles), and Dubois (267 miles). Carry a 5-gallon spare through central Idaho where stations are 90+ miles apart on US-20.

• McCall to Boise: Chevron and Shell in many towns
• Boise to Arco: Murphy USA in Mountain Home, Sinclair in Arco
• Arco to Dubois: only small stations in St. Anthony (100 mi from Arco) and Dubois

Road quality: ID-55 from McCall to Boise is winding two-lane with passing lanes; maintained well but watch for deer at dawn. I-84 east is smooth interstate. US-20/26 after Arco is flat, straight two-lane with occasional potholes near lava fields. WY-26 from the state line to Dubois has frost heaves in spring. No tolls on this route.

For planning stops, check how to find the best stops and hidden gems between cities for tools to discover roadside attractions.

Wildlife crossings: Mule deer and pronghorn are common on US-20 between Arco and the Wyoming state line. Collisions peak at dusk (5:30-7:30 PM local time). There are three designated wildlife underpasses near mileposts 220, 240, and 260. Cameras monitor these; they reduce accidents by 80%.

Family-friendly stops: The Craters of the Moon visitor center has interactive exhibits on vulcanology for children aged 6-12. The nearby town of Arco has the Idaho Nuclear Engineering Laboratory's Experimental Breeder Reactor I (EBR-I) museum—free admission, self-guided tour of a decommissioned reactor core. Both stops have clean restrooms and picnic tables.

Fatigue management: The flat straight stretches after Arco cause highway hypnosis. Schedule a break every 2 hours. Rest areas at mile 215 (Arco Rest Area, has vending machines) and mile 270 (Roberts Rest Area, no services). Pull over at the St. Anthony Sand Dunes (milepost 300 on US-26) to walk 10 minutes on soft sand—resets focus.

Pet-friendly framework: All rest areas allow leashed pets. Craters of the Moon allows dogs on leash on paved trails only—avoid lava tubes due to sharp rocks. The Idaho section has rattlesnakes in summer; keep dogs on trail. Dubois has a fenced dog park at 119 N Wagner St, open dawn to dusk.

The first 50 miles out of McCall follow the Payette River through a U-shaped valley. Douglas fir and lodgepole pine line the road. At milepost 35, a turnout offers views of 7,000-foot Black Tip Peak. This is prime mountain biking and fishing territory—the North Fork Payette is a blue-ribbon trout stream.

Boise is a 45-minute detour south; skip it for a direct route and instead stop at the Snake River Birds of Prey National Conservation Area (20 miles south of Mountain Home on Simco Road). Over 700 pairs of raptors nest in the canyon. Local ranchers sell fresh beef jerky at roadside stands near Glen's Ferry.

Craters of the Moon National Monument and Preserve (milepost 190 on US-20) is a preserved volcanic landscape. The 7-mile loop drive passes spatter cones, cinder cones, and the 800-year-old Blue Dragon Flow. Lava tubes open year-round (bring a flashlight). Entry fee is $20 per vehicle for 7 days.

From Arco east, US-20 climbs onto the Snake River Plain. The topography shifts to sagebrush steppe with the Lost River Range visible 50 miles north. The town of Mud Lake (population 320) has a general store selling handmade turquoise jewelry. The transition into Wyoming is marked by the Teton Range appearing faintly on the horizon—an optical illusion that persists for 60 miles.