Idaho Falls to Anacortes: Ultimate Road Trip Guide

Driving from Idaho Falls, ID to Anacortes, WA is a 650-mile journey that traverses three distinct geographic provinces: the high desert of the Snake River Plain, the rugged Bitterroot Range of the Rockies, and the temperate rainforests of the Puget Sound lowlands. The route primarily follows I-15 north to I-90 west, then US-20 and WA-20, with a notable quirk: just west of Butte, Montana, the interstate dips into a canyon carved by the Continental Divide, where you'll cross the divide twice in under 30 miles—a rarity in North American road design.

Estimated driving time without stops is 10 to 11 hours, but the journey rewards those who linger. The best stops between Idaho Falls, ID and Anacortes, WA range from the surreal geothermal features of Craters of the Moon to the tide pools of Deception Pass. To truly appreciate the depth of this corridor, refer to how to find the best stops and hidden gems between cities.

Road quality on this route is generally excellent, with well-maintained interstates and state highways. However, winter driving demands caution: I-15 north of Idaho Falls and I-90 over Lookout Pass frequently see snow and ice. Always carry chains during winter months. Wildlife crossings (especially deer and elk) are common at dawn and dusk near the Bitterroot and Skagit valleys.

For families, the Idaho Falls Zoo at Tautphaus Park and the Children's Museum of Idaho Falls are excellent starts. In Butte, the World Museum of Mining offers engaging exhibits for older kids. In Washington, the Deception Pass State Park provides easy hiking trails and tide pool exploration—perfect for kids aged 5 and up.

Fatigue management is crucial on this long drive. Plan rest stops every 2-3 hours: rest areas are spaced roughly 60-80 miles apart on I-15 and I-90. Consider an overnight stop in Missoula (midpoint) or Spokane (two-thirds of the way). Caffeine options are plentiful at truck stops and Starbucks in all major towns.

• Rest stop recommendation: Lookout Pass Rest Area (MT) has picnic tables and a scenic overlook.
• Family stop: Lake Coeur d'Alene offers boat rentals and a boardwalk for kids.
• Pet-friendly: Most rest areas have dog-walking areas; many hotels in Missoula and Spokane accept pets for a fee.

Fuel stations are abundant in urban centers like Idaho Falls, Butte, Missoula, Coeur d'Alene, Spokane, and Burlington, but become sparse in the stretch between Butte and Missoula (roughly 120 miles) and on WA-20 from Sedro-Woolley to Anacortes (40 miles). Towing services are widely available via AAA and local operators; cell coverage is strong along interstates but spotty in mountain passes—particularly near Lookout Pass and the North Cascades Highway.

Rest areas are strategically placed: the Idaho Falls Rest Area (milepost 119 on I-15) offers clean facilities and picnic tables; further north, the Lost Trail Pass Rest Area near the Montana-Idaho border provides stunning views of the Bitterroot Range. Washington state’s rest areas on I-90 (like the one near Ellensburg) have free WiFi and vending machines.

• Idaho Falls to Butte: Fuel every 50-70 miles; gas prices are slightly lower in Idaho.
• Butte to Missoula: No services for ~100 miles; fill up in Butte or Anaconda.
• Western Montana: Expect winter closures on I-90 over Lookout Pass (elevation 4,700 ft) from November to April.

The drive begins in the Snake River Plain, a volcanic basin dotted with sagebrush and irrigation canals. Just 20 miles west of Idaho Falls, Craters of the Moon National Monument preserves a landscape of lava flows, cinder cones, and caves—among the best natural attractions between Idaho Falls and Anacortes. Further north, the Bitterroot Valley offers orchards, vineyards, and the historic town of Hamilton, where you can sample local huckleberry products.

As you cross into Washington, the arid interior yields to the lush Skagit Valley, renowned for its tulip fields (peak bloom in April) and farm stands selling fresh berries and cheese. Anacortes itself sits on Fidalgo Island, gateway to the San Juan Islands, with a historic downtown featuring galleries, seafood markets, and the Anacortes Brewery.