Tacoma to Butte Road Trip: Mountains, Mining & Hidden Gems

This route follows I-90 east from Tacoma, Washington, to Butte, Montana, crossing the Cascade Range, the Columbia Plateau, and the Rocky Mountains. The drive covers 540 miles and typically takes 8.5 hours without stops. One notable fact: the section from Ellensburg to Vantage crosses the Columbia River at the Wanapum Dam, where the basalt cliffs are remnants of the Miocene-era Columbia River Basalt Group, one of the largest flood basalt provinces on Earth.

Butte, known as the 'Richest Hill on Earth,' sits at an elevation of 5,545 feet and is home to the Berkeley Pit, a former open-pit copper mine now a Superfund site. The contrast between the rainy, forested Pacific Northwest and the high, arid plains of Montana is striking. Along the way, you can explore how to find the best stops and hidden gems between cities.

Leaving Tacoma, the road climbs into the Cascade Range via Snoqualmie Pass (elevation 3,022 ft). In winter, chains may be required. Summer offers wildflowers and clear views of Mount Rainier. The descent into Ellensburg reveals the arid shrub-steppe of the Columbia Basin.

• Natural attractions: Snoqualmie Pass, Columbia River Gorge overlook near Vantage, the Channeled Scablands near Moses Lake
• Detour: Take exit 93 for Thorp and visit the Thorp Grist Mill (historic 1849 flour mill) or the town of Cle Elum for its antique shops

Between Moses Lake and Spokane, the landscape is flat agricultural land. The town of Ritzville has a classic Americana Main Street. Near Spokane, Riverside State Park offers hiking along the Spokane River. In Idaho, Coeur d'Alene Lake is a popular stop for boating and dining.

Eastern Washington and northern Idaho produce wine and hops. Stop at a local winery in the Yakima Valley (a short detour south from Ellensburg) or at a brewery in Coeur d'Alene. Montana's stretch features the Bitterroot Valley and the Sapphire Mountains, with local artisans selling huckleberry products.

UNESCO World Heritage Sites: None directly on route, but the nearby Yellowstone National Park (5 hours from Butte) is a UNESCO site. In Butte, the Butte-Anaconda Historic District is a National Historic Landmark and on the tentative list for UNESCO.

The main highway is I-90, a well-maintained interstate with rest areas every 30-40 miles. Key exits and fuel stops are at Ellensburg (milepost 106), Moses Lake (milepost 179), Ritzville (milepost 221), Spokane (milepost 280), Coeur d'Alene (milepost 11 in Idaho), Missoula (milepost 101 in Montana), and Butte (milepost 220).

• Total distance: 540 miles (870 km)
• Driving time: 8 hours 30 minutes without traffic
• Fuel economy: Expect 25-30 MPG; budget ~$70-90 for gas (October 2023 prices)

Most gas stations are clustered around towns; rural stretches like between Ritzville and Spokane have limited services. Carry extra water and snacks. Cell coverage is intermittent in the Cascades and some Montana passes.

I-90 is generally safe, but watch for wildlife (deer, elk) at dawn/dusk, especially in Montana. Mountain passes can be icy from November to March. Carry chains and an emergency kit. Speed limits vary: 70 mph in WA, 80 mph in MT.

• Rest zones: Official rest areas at mileposts 93 (Ellensburg), 177 (Moses Lake), 220 (Ritzville), 287 (Spokane), 22 (Idaho), and 130 (Missoula)
• Fatigue stops: Consider overnighting in Spokane or Missoula to break the drive into two days

Family-friendly stops: In Spokane, the Mobius Science Center or Riverfront Park. In Coeur d'Alene, the Silverwood Theme Park (exit 2). In Missoula, the Missoula Art Museum or the Montana Natural History Center.

Pet-friendly framework: Most rest areas have pet exercise areas. Many hotels along the route allow pets (e.g., La Quinta in Spokane, Motel 6 in Missoula). Leash laws apply. Carry poop bags and water bowls. Note that some attractions like national forests require pets on leash.

Culinary infrastructure: Notable food stops include: in Ellensburg, The Yellow Dog Cafe (farm-to-table); in Ritzville, The Ritz Grill (burgers); in Coeur d'Alene, The Garnet Cafe (breakfast); in Missoula, The Mustard Seed (Thai). Butte dining: The Butte Depot has classic Montana steak.

Hidden off-route spots: Palouse Falls (Washington) – a 198-foot waterfall in a remote canyon, about 50 miles south of I-90 via Hwy 26. The ghost town of Garnet, Montana – a well-preserved mining camp, accessible via dirt road near Missoula. The National Bison Range in Moiese, Montana (south of Missoula) – drive through herds of bison.

Climatic conditions & route aesthetics: Winter brings snow and low visibility at passes; spring can be rainy; summer is hot and dry east of the Cascades. The best time for scenery is late spring (wildflowers) or autumn (fall colors in the Rockies).