Garden City to Dillon: A Road Trip Across the Caribou Range

Bear Lake's surreal turquoise tint comes from suspended calcium carbonate crystals, a mineral that gives the lake the nickname 'Caribbean of the Rockies.' Garden City, population 600, sits on this lake's west shore and is the launch point for the route. The lake is 20 miles long and 8 miles wide, and its surface elevation is just under 6,000 feet.

The emigrant trail that later became US-89 was first scouted by John C. Frémont in 1843. This guide covers the route's logistics and stops without skipping the region's quirks. If you're planning, the table in the next section answers how long to drive Garden City, UT to Dillon, MT.

To gauge whether it is worth driving Garden City, UT to Dillon, MT, remember that the route rewards those who stop.

After leaving Bear Lake, the route enters the Caribou-Targhee National Forest, which spans 2.5 million acres of lodgepole pine, subalpine fir, and wet meadows where moose are common. The highest sustained elevation is near Geneva, Idaho, at 6,400 feet, just below the forest's 8,800-foot peaks. Winters bring lake-effect snow to the Bear Lake side and freeze-ups by late November, while July and August feature isolated thunderstorms.

Just north of Montpelier, the Bear Lake National Wildlife Refuge is a free, fenced area that attracts sandhill cranes in September. The road then bends north of the Bear River Range, whose peaks top out near 9,000 feet.

Montpelier's National Oregon/California Trail Center has a one-hour multimedia show about wagon trains, and the early-20th-century Bear Lake County Courthouse is listed on the National Register of Historic Places. Soda Springs has a carbon-dioxide geyser, discovered in 1937 when a well digger hit a pressurized gas pocket; it erupts hourly and is one of only a few CO2 geysers worldwide. The town's Geyser Park is free to visit, and local diners in these towns serve breakfast plates built around huckleberries and eggs.

The route passes through three county seats: Montpelier, Soda Springs, and Dillon. The Bear River, which the route crosses near Soda Springs, is the largest river in North America without an ocean outlet. Yellowstone National Park, the closest UNESCO World Heritage Site, lies roughly 90 miles east of Idaho Falls via US-20; a day trip is tight but possible. Idaho Falls is the route's only city with a population above 50,000, and its restaurant rows along the river offer the widest menu variety. Beaverhead-Deerlodge National Forest, the largest wildland unit in Montana, wraps around Dillon and hosts a scenic drive through the Pioneer Mountains.

Winter maintenance on I-15 is routine, but the section between Garden City and Montpelier can ice over before the plows run. The Montana border crossing has a truck inspection station, and passenger cars rarely stop. For the best stops Garden City, UT to Dillon, MT, prioritize exits with water; the Idaho Falls greenbelt is a 6-mile paved path across the Snake River, perfect for a 20-minute leg stretch.

Bear Lake State Park's marina side has a shallow, roped swim area ideal for toddlers, and Dillon's Main Street is quiet enough for a short walk. Most Dillon hotels allow pets, but the number of pet-friendly rooms is limited; reserve ahead. Idaho Falls has the route's only fenced dog park, and it is adjacent to a grassy picnic area.

When planning things to do between Garden City, UT and Dillon, MT, keep an eye on the clock for Lava Hot Springs, a natural pool complex just off I-15 near McCammon. The pools range from 104 to 112 degrees Fahrenheit, so soaking breaks the final drive into manageable chunks. A short photo stop at the Idaho Falls river bridge is another way to reset tired legs before the last two-hour push to Dillon.

For a systematic way to uncover more detours, see how to find the best stops and hidden gems between cities.

The drive uses US-89 north from Garden City, followed by US-30 west through Soda Springs, then I-15 north to Dillon, Montana. There are no tolls on these highways, and all are maintained year-round. The entire corridor sits above 5,000 feet, so altitude sickness is not a concern.

• Restrooms: 24-hour rest areas exist at Montpelier (ID), Blackfoot (ID), and the Montana border.
• Fuel: Montana's fuel tax is slightly higher than Idaho's; fill the tank in Soda Springs or Idaho Falls for better prices.
• Road quality: I-15 is a divided freeway; US-89 has two lanes with regular passing lanes near Montpelier.