Afton WY to Kellogg ID Road Trip Guide

Afton, Wyoming sits at 6,240 feet in the Star Valley, and Kellogg, Idaho is a former silver-mining town at 2,282 feet. The 268-mile drive via US-89 North and I-90 West gains the Continental Divide at Teton Pass (8,431 ft) before descending into the Snake River Plain.

Unlike the direct interstate, this route traverses three mountain ranges and two national forests, offering a cross-section of Rocky Mountain geology. Temperatures can swing 30°F between start and end, so layer clothing regardless of season.

Infrastructure safety is high; guardrails are present on mountain curves, and rumble strips flank I-90. Cell coverage is spotty in canyons; download offline maps. Most rest areas are open 24/7 with picnic tables and restrooms.

Family stops include the Teton County Historical Society Museum in Driggs (7 miles off US-89) with a children's corner. Kid-friendly hikes like the Big Hole Pass Trail (easy, 2 miles) are accessible from the road.

Pet-friendly: Leashed pets are allowed at most rest areas and trails in Caribou-Targhee National Forest. The Fairfield Inn in Idaho Falls welcomes pets with a $50 fee.

Fatigue management: Schedule rest breaks at mile markers 85 (Swan Valley) and 150 (Idaho Falls). The Idaho State Police patrol I-90 heavily; speed limits are 65 mph on US-89 and 75 mph on I-90.

The best stops Afton, WY to Kellogg, ID depend on your pace; the drive takes about 4.5 hours without stops. Fuel prices average $3.50/gal in Idaho vs. $3.80 in Wyoming, so fill up in Idaho Falls for savings. No tolls exist on this route.

• Last Wyoming gas station before the border: Alpine Chevron (Mile 30)
• Idaho's 1-cent-per-gallon state road tax funds maintenance
• I-84 junction at Burley offers a detour to Twin Falls

Road quality is good; I-90 is a four-lane divided highway, while US-89 is two-lane with passing lanes. Winter closures at Teton Pass (WY-22) are rare but possible; check 511. Services are sparse between Alpine and Swan Valley (50 miles) with no exits.

Is it worth driving Afton, WY to Kellogg, ID? Yes, for the views alone, but plan fuel stops to avoid anxiety.

Things to do between Afton, WY and Kellogg, ID include hiking at Palisades Reservoir (37 miles of shoreline) and rafting the Snake River. The Grand Teton and Yellowstone UNESCO World Heritage Sites lie within 60 miles of Afton, but are off-route.

The region's geology spans old volcanic basalts near Idaho Falls and Precambrian quartzite in the Bitterroot Mountains. Kellogg's 4,500-ft Silver Mountain offers summer gondola rides.

Kellogg anchors a “Silver Valley” of 5 towns, with the 1884 Coeur d'Alene mining district. Afton has a 200-foot elk antler arch on its main street, celebrating its nickname as “Elk Capital of Wyoming.”

Local commerce thrives on tourism: Idaho Falls’ farmers market (Sat mornings) sells huckleberry products, a local staple. For a cheap meal, the Mark's Ark diner in Kellogg serves classic American fare since the 1960s.

For hidden gems, consult how to find the best stops and hidden gems between cities.