Olympia to Dillon: Epic Pacific Northwest to Montana Road Trip

This route from Olympia, WA to Dillon, MT covers 712 miles and takes about 11 hours of pure driving time. What makes this journey unique is crossing the Continental Divide not once but three times—via Lookout Pass (4,708 ft), Fourth of July Pass (3,011 ft), and Homestake Pass (6,329 ft)—a geological rarity on a single road trip.

For tips on how to find the best stops and hidden gems between cities, check our guide.

Natural Landscapes & Attractions

Five distinct ecoregions unfold: Puget Sound lowlands, Cascade Range, Columbia Plateau, Bitterroot Mountains, and Northern Rockies. Must-see natural wonders:

• Snoqualmie Pass (WA): 3,022 ft. Alpine meadows and waterfalls. Snoqualmie Falls is 3 minutes off I-90.
• Lake Coeur d'Alene (ID): 25-mile-long glacial lake with turquoise water. Stop at Coeur d'Alene Resort boardwalk.
• Lookout Pass (ID/MT): Scenic ski area; elevation 4,708 ft. Great for a short hike or picnic.
• St. Regis River Valley (MT): Follows the Clark Fork River with dramatic canyon walls.
• Homestake Pass (MT): 6,329 ft; panoramic views of the Pintler Mountains. Just east of Butte.

Local Commerce & Culture

Support local economies by stopping at small-town businesses. Notable stops:

• Ellensburg, WA: historic downtown with galleries and the Clymer Museum.
• Moses Lake, WA: farm stands with apples and cherries in season.
• Kellogg, ID: former mining town; visit the Silver Mountain gondola.
• Wallace, ID: historic district with the Oasis Bordello Museum.
• Missoula, MT: university town with the Missoula Art Museum and local breweries.
• Butte, MT: copper mining history; the World Museum of Mining.
• Dillon, MT: gateway to the Beaverhead-Deerlodge National Forest.

Culinary Infrastructure

Diverse food options from fast food to farm-to-table.

• Ellensburg: The Campus Club for upscale American; Yellow Church Cafe for breakfast.
• Spokane: Frank's Diner (historic railway car) for classic American; Sante for French-Italian.
• Wallace, ID: The Snake Pit for burgers; 1313 Club for bar food.
• Missoula: Plonk (seasonal dishes); Five on Black (Brazilian bowls).
• Butte: Pork Chop John's (local chain); Butte Brewing Company.
• Dillon: Pat's Place (steaks); The Filling Station (pizza).

Infrastructure Safety & Road Quality

Overall safe route; typical interstate hazards. Winter travel (Nov-Mar) requires chains at passes. Summer thunderstorms can cause sudden visibility drops.

• Cell service: Strong in cities; weak between Ritzville and Spokane, and in mountain passes.
• Emergency services: Major towns have hospitals; rural areas have volunteer fire departments.
• Rest areas: Frequent along I-90, about every 30-40 miles. Well-maintained.

Fatigue Management & Rest Zones

Long, monotonous stretches (especially across the Columbia Basin) can induce drowsiness. Plan breaks every 2 hours.

• Best rest stops: Snoqualmie Pass East (milepost 54) has views and picnic tables; Fourth of July Pass (milepost 1) has a scenic overlook.
• Designated sleep spots: Park-and-rides in Coeur d'Alene and Missoula allow overnight RV parking.

Family and Child Suitability

Ideal for families with frequent attractions and safe stops.

• Top kid-friendly stops: REI in Seattle (gear and climbing wall); Silverwood Theme Park (Athol, ID) near Coeur d'Alene; historic train ride in Wallace.
• Activities: Kids can earn Junior Ranger badges at national forest visitor centers.
• Stroller access: Most rest stops are paved; some trails are compacted gravel.

Pet-Friendly Framework

Hotels and many attractions welcome pets.

• Pet relief areas: Every rest stop has designated grass areas; some have pet waste stations.
• Vet clinics: In Spokane, Missoula, Butte, and Dillon. Emergency: Washington State University Vet Hospital in Pullman (2 hr detour).

Fuel and Route Economics

Gas prices along I-90 vary significantly. In Washington, expect $3.50-$4.00/gal; in Idaho, $3.20-$3.60; in Montana, $3.10-$3.40. Filling up in Idaho can save $10-15 per tank.

• Recommended fuel stops: Ellensburg, WA (cheaper than Seattle area); Coeur d'Alene, ID (competitive); Butte, MT (last chance before Dillon).
• Distance between fuel stations: Over 50 miles on some sections (e.g., between Ritzville and Spokane, WA). Always start with a full tank outside major cities.

Road Quality and Traffic

I-90 from Olympia to Dillon is primarily interstate with good pavement. However, mountain passes can have rough patches, especially after winter. Construction delays are common in summer near Ellensburg and in the Coeur d'Alene area.

• Traffic congestion: Heavy through Seattle-Tacoma corridor (I-5); moderate near Spokane; light after Missoula.
• Road conditions: Check WSDOT and MDT apps for pass reports.