Great Falls to Garden City: Epic Road Trip Guide

This road trip begins at the iconic Lewis and Clark National Historic Trail Interpretive Center in Great Falls, MT, where the Missouri River plunges over a series of five waterfalls. From there, you'll traverse 460 miles south to Garden City, UT, a small town on the shores of Bear Lake. The route primarily follows I-15 S, passing through Butte, MT, Idaho Falls, ID, and Logan, UT, before a scenic detour into the Bear Lake Valley.

Did you know that this stretch of I-15 crosses the continental divide three times? Near Butte, the highway reaches an elevation of 6,350 feet at the Homestake Pass. This geographic quirk means your vehicle's engine and brakes will work hard, so plan for steep grades and cooler temperatures even in summer. Estimated driving time without stops is 6.5 hours, but we recommend a full day or more to explore hidden gems along the way.

For a deeper dive into discovering lesser-known attractions, check out this guide on how to find the best stops and hidden gems between cities. In this guide, we'll cover everything from natural landscapes and fuel economy to family-friendly stops and pet-friendly spots.

Long stretches of straight highway can induce drowsiness. Plan to stop every 2 hours or 100 miles. Our recommended rest stops include the Montana rest area at milepost 110 (with clean bathrooms and picnic tables) and the Idaho Welcome Center near the border (full service with travel info).

For families, the trip offers many kid-friendly attractions. In Butte, the Our Lady of the Rockies statue overlooks the city and is accessible by a scenic drive. The Idaho Falls Zoo at Tautphaus Park is a great 1-2 hour stop with over 300 animals. In Logan, UT, the American West Heritage Center offers pony rides and pioneer exhibits. Bear Lake itself has gentle beaches perfect for young children.

Pet owners will find many welcoming spots. Most rest areas allow leashed pets. Idaho Falls has several dog parks, including the Tautphaus Park dog park. Many hotels in Butte, Idaho Falls, and Garden City are pet-friendly (call ahead to confirm fees). For off-leash fun, the Bear Lake State Park beach allows dogs during certain hours. Always carry water and waste bags, as summer temperatures can exceed 90°F.

Hidden off-route spots worth the detour include the Clark Canyon Dam near Dillon, MT, where the Beaverhead River flows—great for fishing and birdwatching. Near Lima, MT, the ghost town of Hecla offers crumbling buildings from mining days. In Idaho, the Lava Hot Springs (exit 80 off I-15) provide natural hot pools with family-friendly facilities. These spots break up the drive and offer unique memories.

Culinary infrastructure ranges from fast food at exits to local dives. In Butte, try the pasties (Cornish meat pies) at Joe's Pasties. Idaho Falls has excellent Mexican food at El Rancherito. For a memorable meal in Garden City, visit La Beau's for their famous buttermilk onion rings and Bear Lake trout. Pack snacks from local grocery stores like Broulim's in Rexburg to avoid limited options on remote stretches.

From Great Falls southbound, you'll pass through the expansive Missouri River Valley with vistas of the Rocky Mountain Front. Near Cascade, look for the Giant Springs State Park, one of the largest freshwater springs in the country. The water is a constant 54°F year-round.

As you approach Butte, the landscape morphs into the dramatic high-altitude desert of the Continental Divide. Butte itself is a historic copper mining town with a revived downtown. Stop at the World Museum of Mining for a glimpse into the region's industrial past. Local commerce thrives in small boutiques and diners like the famous Pork Chop John's.

Continuing south into Idaho, the route follows the Snake River Plain. The volcanic terrain yields unique features like the Craters of the Moon National Monument, a short detour off US-20. Here you can explore lava tubes and cinder cones—a must-see for geology lovers. The area is a designated UNESCO Global Geopark, though not a World Heritage site; however, nearby Yellowstone National Park (a UNESCO World Heritage site) is a 2-hour detour from Idaho Falls.

Local culture shifts from Montana's cowboy ethos to Idaho's agricultural heartland. In eastern Idaho, potatoes rule. Stop at a family-owned farm stand near Rexburg for fresh produce or visit the Idaho Potato Museum in Blackfoot (slightly off-route). The region also has a strong Basque influence, evident in small-town festivals and cuisine.

Finally, the descent into Utah's Cache Valley reveals the Bear River Mountains and the turquoise waters of Bear Lake. Garden City is a laid-back lake town with a marina and local shops. The lake's unique blue hue is due to suspended calcium carbonate, often compared to the Caribbean. This area is a popular summer retreat for swimming, boating, and raspberry shakes—a local specialty from the numerous drive-in stands.

Fuel and rest stops are plentiful along I-15, but some stretches—especially south of Butte through the Blackfoot Reservation—have gaps of up to 60 miles without services. Plan to fill up in Great Falls, Butte, Dillon, and Idaho Falls. Gas prices tend to be lower in Montana than in Idaho or Utah.

Road quality is generally excellent: I-15 is a well-maintained interstate with modern pavement, clear signage, and wide shoulders. Construction zones are common in summer, especially near the Idaho-Utah border. Check current conditions via local DOT sites before departure.

For electric vehicle owners, charging stations are available at intervals of roughly 50-80 miles along the route. Major brands include Tesla Superchargers in Butte, Idaho Falls, and Ogden (just west of Garden City). Plan to charge at these points to avoid range anxiety.

Weather can change rapidly, particularly in the mountain passes. In winter, snow tires or chains may be required. Summer brings afternoon thunderstorms and occasional hail. Always carry emergency supplies: water, blankets, jumper cables, and a first aid kit.