Cascade ID to Alpine WY: Scenic Road Trip Guide

This route from Cascade, ID to Alpine, WY spans roughly 380 miles via US-20 and US-26, crossing the Continental Divide at an elevation of 7,037 feet at Teton Pass. It's a drive that transitions from Idaho's volcanic plains to Wyoming's alpine peaks, offering distinct geological contrasts within a single day's drive.

The journey typically takes about 6.5 hours of pure driving time without stops, but plan for at least 8-10 hours to savor the landscapes. The area is a hotspot for seismic activity, with the Yellowstone hotspot responsible for the region's geothermal features and the Teton Range's dramatic uplift.

The route primarily follows US-20 east from Cascade to Idaho Falls, then US-26 southeast into Wyoming. The road is well-paved and maintained year-round, but winter conditions can bring heavy snow, especially over Teton Pass.

• Fuel: Gas stations are sparse between Cascade and Idaho Falls, so fill up in Cascade or at the small town of Arco (mile 120). After Idaho Falls, fuel is available in Swan Valley and Alpine.
• Road conditions: Check Idaho 511 and Wyoming 511 for real-time updates; closures are common during winter storms.
• Restrooms: Rest areas are available at Craters of the Moon and near Palisades Reservoir.

The road has long straight stretches, which can cause driver fatigue; plan breaks every 2 hours. Rest areas are available at the Craters of the Moon visitor center and at Palisades Reservoir.

• Family-friendly: Craters of the Moon offers a 7-mile loop drive with short nature trails suitable for kids.
• Pet-friendly: Dogs are allowed on trails at Craters of the Moon, but must be leashed. In summer, pavement can be hot; carry water.
• Hidden off-route spot: Off the beaten path is the Menan Butte, a volcanic cone with a steep trail to panoramic views, accessible from a gravel road near Menan, ID.

Things to do between Cascade, ID and Alpine, WY include fishing in the South Fork of the Snake River and soaking in geothermal springs near Ashton.

Craters of the Moon National Monument is a must-see, with lava fields and cinder cones formed by volcanic eruptions 15,000 years ago. It's a designated UNESCO World Heritage site?

No, it's not, but nearby Yellowstone National Park is. The drive also passes through the Caribou-Targhee National Forest, offering wildlife viewing of elk and moose.

Best stops Cascade, ID to Alpine, WY include the lava tubes and the visitor center, which has exhibits on volcanic geology. The local commerce in Idaho Falls offers farm-to-table dining, while Alpine is a gateway to Jackson Hole's upscale resorts.

Learn more about discovering stops with how to find the best stops and hidden gems between cities.