Provo to Kellogg Road Trip: 10-Hour Idaho Adventure

Provo, UT sits at the foot of the Wasatch Range, and Kellogg, ID is a former silver-mining town in the Coeur d'Alene Mountains. The drive spans 630 miles, roughly 10 hours without stops, along I-15 N and I-90 W. The route climbs from 4,500 feet in Provo to over 5,800 feet at the Continental Divide in Montana, offering dramatic elevation changes.

One notable quirk: the road crosses the Continental Divide twice—once at Monida Pass (elevation 6,870 ft) and again at Lookout Pass (elevation 4,730 ft), the latter marking the Idaho/Montana border. The final 30 miles into Kellogg follow the Coeur d'Alene River, a scenic byway carved into steep canyon walls.

GPS typically suggests I-15 N through Idaho Falls, then I-90 W at Butte, MT. The fastest route is roughly 630 miles, but you'll want to factor in stops. Speed limits vary: 70 mph in Utah, 80 mph on most of I-15 in Idaho, 75 mph on I-90 in Montana, and 65 mph in the final mountain section into Kellogg.

• Fuel stops: Every 50-70 miles along I-15 and I-90. Cheapest gas often in Idaho Falls (avg. $3.10/gal) and Butte (avg. $3.20/gal); expensive in remote stretches (avg. $3.50/gal near Monida Pass).
• Calculate total fuel cost: A midsize sedan doing 30 mpg will need ~21 gallons, costing ~$66 at average $3.15/gal.
• Cash vs. card: Most stations accept cards, but carry cash for smaller towns like Lima, MT (only one station).

For how to find the best stops and hidden gems between cities, consider detours like the historic town of Wallace, ID (population 784) that evaded Interstate bypass due to citizen efforts, preserving its charming main street.

The route showcases three distinct ecosystems: Utah's red-rock desert, Idaho's vast lava fields and potato farms, and Montana's pine-clad mountains. As you cross into Montana, the Yellowstone River Valley offers sweeping views of the Absaroka Range. Look for signs marking the Continental Divide at Monida Pass—an unmarked spot perfect for a photo.

Local commerce along the way includes the Idaho Potato Museum in Blackfoot (open Mon-Sat, $8 admission), which celebrates the state's signature crop. In Montana, the town of Butte offers the World Museum of Mining (open daily, $11) near the Berkeley Pit, a former open-pit mine now a superfund site.

Hidden off-route spots: After Butte, detour 15 miles east to the Lewis and Clark Caverns State Park (guided tours $9), a limestone cave with dramatic stalactites. Another gem: the 50-mile dry lake bed of the Utah Salt Flats, just west of I-15 near Salt Lake City, accessible via exit 77 if you have time.

Road quality is generally good: asphalt in good condition, with occasional rough patches in Montana during spring thaw. Winter (Nov-Mar) brings heavy snow and ice, especially on Lookout Pass—you'll need chains or studded tires. Summer roadwork is common; check 511 Road Reports for closures.

For family and child suitability: stops with playgrounds include Idaho Falls' Riverwalk (with playground at the Greenbelt) and Butte's Stodden Park (with splash pad). For a longer break, the Museum of Clean in Pocatello (10 min off I-15) baffles kids with interactive dirt removal exhibits—open Tue-Sat, $5.00.

Pet-friendly framework: Most exit gas stations and rest areas have grassy patches. In Idaho, rest areas along I-84 are pet-friendly but require leashes. In Montana, the rest area at Deer Lodge (milepost 184) has a dedicated dog run.

Fatigue management: The longest no-services stretch is between Arco, ID (milepost 200) and Lima, MT (milepost 0) over Monida Pass—about 60 miles. Plan a break at the Idaho Falls Greenbelt (restrooms, shaded benches) around the midpoint. For a power nap, exit at the Dubois, ID Rest Area (milepost 160) which is quiet and has picnic tables. Aim to stop every 2 hours; total suggested rest time is 1.5 hours.