West Yellowstone to Mosier: Epic Drive Guide

This 700-mile journey begins at the doorstep of Yellowstone National Park, the world's first national park, and ends in the Columbia River Gorge, a National Scenic Area. The route traverses three states—Montana, Idaho, and Oregon—and crosses the Continental Divide twice.

The drive offers a dramatic transition from volcanic geysers and alpine forests to the high desert of the Snake River Plain, and finally to the lush, river-carved canyons of the Pacific Northwest.

Shortly after leaving West Yellowstone, you'll pass through Island Park, known for its caldera rim and geothermal features. The route then skirts the Teton Range, offering views of Grand Teton National Park (a separate park from Yellowstone).

In Idaho, Craters of the Moon National Monument preserves a volcanic landscape of lava fields and cinder cones; it's a UNESCO World Heritage Site nominee.

Along the way, small towns like Ashton, ID and Ontario, OR have local diners and farm stands. The region is known for potato farming, and you can visit the Idaho Potato Museum in Blackfoot (detour off I-15).

Wildlife crossings are common, especially at dawn and dusk—remain alert. Speed limits vary: 80 mph on some Idaho highways, 65-70 mph in Oregon.

For families, the Oregon Trail Interpretive Center in Baker City provides interactive exhibits. Kids will also enjoy the aquatic playground at the Ontario Aquatic Center.

Most hotels are pet-friendly, but always confirm. Designated rest areas are spaced well; however, planning stops every 2 hours is wise to combat fatigue.

The most direct path follows US-20 West through Idaho, then connects to I-84 West in Oregon. Alternatively, a more scenic route via US-12 in Idaho offers river vistas but adds significant time.

Cell service is intermittent in remote stretches, so download offline maps. Road quality is generally excellent on interstates, but mountain passes like Teton Pass (closed in winter) require caution.

• Fuel economy: Expect about 25-30 mpg for a mid-size car; plan fuel stops every 200-250 miles.
• Notable rest areas: Rest areas with restrooms exist near Idaho Falls, ID and Baker City, OR.
• For unique stops, use this how to find the best stops and hidden gems between cities guide.