Green River to Kellogg Road Trip: Deserts, Rockies, and Silver Valley

On this 741-mile route, you'll traverse the high desert of Wyoming, the Snake River Plain of Idaho, and the forested panhandle near the Montana border. The highest point is 8,640 feet at Soldier Summit in Utah (a detour), but on the main route, you'll crest 7,200 feet at Monida Pass. The drive takes roughly 11 hours without stops, but plan for at least two days to enjoy the major attractions.

Start in Green River, WY, a town named for the Green River that flows through Flaming Gorge National Recreation Area. End in Kellogg, ID, once a mining hub, now a base for Silver Mountain Resort. The route crosses two time zones (Mountain to Pacific) and passes through three states.

Here's a quick overview of the journey:

Absolutely, for those who love wide-open spaces and quirky roadside stops. You'll see the world's largest potato in Blackfoot, the eerie Craters of the Moon, and the deepest river gorge in North America (Hells Canyon, a side trip). The route also skirts the Oregon Trail and the Bear River Massacre site.

For planning tips, check out our guide on how to find the best stops and hidden gems between cities.

The main arteries are I-80 east to I-84 west to I-90 west. The roads are in good condition, but expect construction zones in summer. Speed limits range from 75 to 80 mph on interstates. Cell coverage is spotty in rural stretches, especially in Idaho's Magic Valley and the mountains near the Montana border.

Gas prices are generally lower in Idaho than Wyoming or Montana, but still plan for $60–80 per fill-up for a typical sedan. Fuel stops are plentiful every 50–80 miles, but never let the tank drop below a quarter as there are long stretches between services.

Here's what to expect for facilities:

• Rest areas with restrooms and picnic tables every 100–150 miles.
• 24-hour truck stops at major junctions (Pocatello, Boise, Coeur d'Alene).
• Visitor centers in Twin Falls, Idaho Falls, and Kellogg.

Start with Flaming Gorge, just south of Green River, a red-rock canyon on the Wyoming-Utah border. The Flaming Gorge Dam is 502 feet tall. Further west, Shoshone Falls near Twin Falls is 212 feet high—higher than Niagara—and flows with spring snowmelt. The entire Snake River Plain is volcanic basalt, dotted with cinder cones; Craters of the Moon National Monument is a 750,000-acre lava field that last erupted 2,100 years ago.

As you approach the Rockies, the landscape shifts to pine forests and granitic peaks, with the Sawtooth Mountains visible to the south from I-84. The Silver Valley around Kellogg is named for its silver mines, which produced over $1 billion in ore.

Local commerce reflects the region's heritage. In Idaho Falls, you'll find the Idaho Potato Museum in Blackfoot (founded 1989). In Arco, the world's first nuclear power plant (now a museum) brewed electricity in 1951. Along the route, small towns like Lava Hot Springs offer natural hot springs and a historic swimming pool.

Don't miss the ghost town of Bayhorse (a side trip) or the $1,000,000 Castle of Bones in Craters of the Moon. And in Kellogg, the Silver Valley Mining Museum preserves the area's hard-rock history.

Winter travel can be hazardous; snowstorms can close I-80 and I-84. Always carry chains and check road conditions. Summer brings thunderstorms and hail. The route is generally safe, but wildlife (deer, elk) can wander onto roads at dawn and dusk.

For families, there are several engaging stops: the Discovery Center in Twin Falls, the Zoo Idaho in Pocatello, and the Silverwood Theme Park in Athol, just north of Coeur d'Alene. These are spread out, so plan for a mix of driving and activities.

Fatigue is a real concern on long stretches. Use the rest areas in Declo, ID, and the scenic overlook at the Snake River near Weiser. If you need a break, the town of Shoshone has a museum, and the city of Boise has a greenbelt along the river for a quick leg-stretch.

Pets are welcome at most outdoor attractions, but keep them on a leash. Water and shade are limited in the desert, so pack accordingly.