Park City, UT to Dillon, MT: A Scenic Road Trip Guide

This route from Park City, Utah to Dillon, Montana spans approximately 360 miles, mostly along US-40 and I-15. The drive takes about 6 hours without stops, but plan for 8-9 hours to enjoy the scenery and attractions. A unique detail: near the Utah-Idaho border, you'll cross the Bear River, which feeds the Great Salt Lake, a remnant of the ancient Lake Bonneville.

Major highways include US-40 from Park City to I-80, then I-80 west to I-15 north. After Salt Lake City, continue on I-15 through Utah and Idaho to exit 23 near Dillon. Fuel stops are frequent along I-15, but the stretch between Idaho Falls and Dillon has fewer options, so fill up in Idaho Falls.

• Best fuel stops: Salt Lake City, Ogden, Brigham City, Tremonton, Malad City, Pocatello, Idaho Falls.
• Estimated fuel cost: about $50 for a standard sedan at $3.50/gal.

Road quality is excellent on interstates, but watch for winter conditions from November to March. Snow tires or chains may be required. The route passes through mountain passes near the Utah-Idaho border, with elevation changes from 4,900 ft in Park City to 5,200 ft in Dillon.

Road safety is high on interstates, but wildlife crossings are common, especially at dawn/dusk. The speed limit is 80 mph in Idaho. Rest areas are available every 30-50 miles: Nevada Rest Area (exit 368), Portneuf Rest Area (exit 36), and Beaverhead Rest Area (exit 5). For family stops, Lava Hot Springs has a water park and Olympic swimming complex.

• Pet-friendly stops: Brigham City Dog Park, Pocatello Dog Park, rest areas with leash areas.
• Fatigue management: Stop every 2 hours. Best rest stops: Brigham City (temple view), Malad City (park), Idaho Falls (river walk).

Hidden off-route spots: City of Rocks National Reserve (near Almo, Idaho) about 30 miles off I-15 at exit 245, and Clark Canyon Reservoir near Dillon for fishing. For dining, try Maddox Ranch House in Perry, Utah (famous for chicken and rolls) or the Idaho Falls Farmers Market if visiting on a Saturday. Use this guide to discover more.

The drive offers diverse landscapes: the Wasatch Range, Great Salt Lake, arid plains of southern Idaho, and the Beaverhead Mountains near Dillon. Notable natural attractions include Antelope Island State Park (accessible from I-15 near Salt Lake City) and the Bear River Migratory Bird Refuge near Brigham City. For culture, detour to Lava Hot Springs, Idaho, a historic resort town with natural hot springs.

• Natural Landscapes: Wasatch Range, Great Salt Lake, Bear River, Portneuf River valley, Beaverhead Mountains.
• Attractions: Antelope Island State Park, Bear River Migratory Bird Refuge, Lava Hot Springs, Fort Hall Replica.

Local commerce includes artisan shops in Park City, farm stands in Cache Valley, and Montana's ranch economy. In Dillon, visit the Beaverhead County Museum to learn about the area's mining and ranching history. The route also passes near the proposed site of the Bear River Massacre, a significant historical area.