Stanley to Kemmerer: Idaho's Rugged Backcountry Route

The route from Stanley, Idaho to Kemmerer, Wyoming crosses the Snake River Plain, ascends into the Caribou-Targhee National Forest, and finally drops into Kemmerer's high desert basin. Along the way, you'll traverse the land of the Eastern Shoshone and Bannock tribes. The drive encompasses three distinct geologic provinces: the Idaho batholith, the Snake River Plain, and the Wyoming Overthrust Belt.

Kemmerer is the birthplace of J.C. Penney, founded in 1902, and sits adjacent to Fossil Butte National Monument, a treasure trove of 50-million-year-old fish fossils. The region's dramatic elevation changes—from 6,200 feet in Stanley to 6,900 feet in Kemmerer—create shifting ecosystems and weather patterns.

How long to drive Stanley, ID to Kemmerer, WY? Expect 5-6 hours behind the wheel, not counting breaks. The fastest route is via US-20 East to Idaho Falls, then US-26 East through Swan Valley and Alpine, WY, then US-89 South to Kemmerer. However, a more scenic alternative is ID-75 South to US-93, then US-26 East, passing through Arco and Idaho Falls.

Fuel stops are sparse between Stanley and Idaho Falls, so fill up in Stanley or Sun Valley. Beyond Idaho Falls, services become more frequent in Swan Valley and Alpine. As of 2025, gas prices in Idaho average $3.50/gallon, while Wyoming averages $3.30, making Kemmerer a slightly cheaper refueling point.

• Road conditions: I-15 and US-26 are well-maintained, but US-89 between Alpine and Kemmerer has sections with narrow shoulders.
• Winter travel: Mountain passes like Teton Pass can close due to snow; check conditions at 511.idaho.gov and 511wyoming.net.
• No tolls on this route.
• Most of the drive is on two-lane highways with occasional passing lanes.

Natural landscapes dominate the drive. Starting in Stanley, you’re greeted by the jagged Sawtooth Range, a mecca for hikers and hot springs enthusiasts. As you descend toward the Snake River Plain, farmland and lava fields appear, remnants of ancient volcanic eruptions. Near Idaho Falls, the Snake River widens, and you’ll spot the historic Idaho Falls Temple—a striking white granite structure.

Further east, the Caribou-Targhee National Forest offers dense pine forests and opportunities to spot elk and moose. Crossing into Wyoming, the landscape opens into sagebrush-covered hills, and near Kemmerer, you’ll find Fossil Butte, a butte of sedimentary rock that holds some of the world's best-preserved fish fossils.

Local commerce along the route reflects the region's ranching and mining heritage. In Stanley, tiny outfitters cater to adventure travelers. Idaho Falls boasts the Grand Teton Mall and chain restaurants, while Kemmerer retains a historic downtown with the J.C. Penney Mother Store—a museum and retail spot. For a taste of local flavor, stop in Alpine for a burger at the Astoria Senior Center's café, a community-run spot known for its friendly service.

UNESCO World Heritage Sites are rare in this remote area; the nearest is Yellowstone National Park, about 150 miles north, which is a designated World Heritage Site. While not on the direct route, it's a possible detour for those with extra time.

Infrastructure safety is generally good, but wildlife collisions are a concern, especially at dusk and dawn—deer and elk frequent the roadways. Always buckle up, and keep an eye out for livestock on open-range stretches. The road quality is decent, but potholes can appear after winter, particularly on US-89. Carry a spare tire and emergency kit.

Family and child suitability is high if the kids love the outdoors. Break up the drive at Craters of the Moon National Monument (just off US-20), a volcanic landscape with lava tubes and cinder cones that fascinates young explorers. A short boardwalk is wheelchair-accessible. Another kid-friendly stop is the Idaho Falls Zoo at Tautphaus Park, home to over 300 animals.

Fatigue management is crucial on this long drive. Plan rest stops every 2 hours. Excellent options include the rest areas near Idaho Falls and Swan Valley, both with picnic tables and clean restrooms. For a longer break, pull into the town of Rigby, known as the “Birthplace of Television,” where you can stretch your legs at the Rigby Historic Park.

Pet-friendly framework: Most welcome centers and rest stops allow leashed pets. In Idaho Falls, the Riverwalk along the Snake River is a great spot to walk your dog. Some hotels in Kemmerer, like the Best Western, are pet-friendly, but always confirm in advance. Hidden off-route spots: about 15 miles south of Kemmerer is the town of Fossil, home to a working fossil quarry where visitors can dig for fish fossils (fee applies). Also, a short detour to the town of Arco, the first city in the world powered by nuclear energy (1955), offers a quirky museum.

Climatic conditions affect driving: summer afternoons can bring thunderstorms, and winter brings heavy snow, making chains necessary. The best times to drive are late spring and early fall, when the weather is mild and the scenery is vibrant.

For more tips on uncovering hidden gems, check out how to find the best stops and hidden gems between cities. And if you're considering whether it's worth driving Stanley, ID to Kemmerer, WY, the answer is a resounding yes—the combination of volcanic history, mountain vistas, and fossil-rich terrain offers a unique cross-section of the American West.