Olympia to Choteau: A Columbia River Gorge & Rocky Mountain Road Trip Guide

This drive crosses the 118th meridian west, a line that splits the continent's rainfall. You'll leave the misty Puget Sound and enter the arid Columbia Basin, then climb into the Rocky Mountain Front. The route follows US-12 east to I-90, then US-287 north. The total distance is 720 miles; expect 11-13 hours of driving without stops.

The Cascade Range acts as a weather sieve: Olympia gets 50 inches of rain annually; Choteau gets 15. This transition is visible in the vegetation—from Douglas fir to sagebrush to ponderosa pine. The how to find the best stops and hidden gems between cities approach works well here: the towns of Vantage, Washtucna, and Dupuyer hide stories worth unearthing.

Best stops for kids: The REACH Museum in Richland (interactive Columbia Basin history), and the Hockberger's Museum of the Prairie in Choteau (dinosaur fossils). Pet-friendly parks: Paws Up Park in Missoula (off-leash area) and the Riverfront Park in Great Falls (leash required).

• Rest zones: I-90 has rest areas at mile markers 85 (near Ellensburg), 200 (Moses Lake), and 299 (Coeur d'Alene). US-287 has a rest area at the Toston Dam (mile 28) and a pullout at the Sun River.
• Fatigue warning: The long straight stretches on I-90 in the Columbia Basin can cause monotony. Stop at the Vantage rest area for a walk to the petrified forest.

Hidden off-route: Lake Wenatchee State Park (30 miles north of Leavenworth, off US-2) offers turquoise water and hiking. The ghost town of Bodie, WA (near Wauconda, off SR-20) is an abandoned mining camp. In Montana, the Pine Butte Preserve near Choteau has hiking trails through badlands with dinosaur bones.

• Local eateries: The Bluebird Café in Winthrop (WA) for huckleberry pancakes. The Roadhouse in Lincoln (MT) for bison burgers.
• Climatic aesthetics: Spring brings wildflowers in the Palouse (late April). Fall colors peak in early October in the Coeur d'Alene River valley. Winter offers snow-capped mountains but requires caution.

From Olympia, head east on US-12 through the White Pass Scenic Byway. Mount Rainier dominates the skyline south of the highway. At Yakima, the landscape opens into orchards and vineyards. The Yakima Valley produces 75% of the nation's hops; you'll see hop trellises and tasting rooms in Zillah.

• Gingko Petrified Forest State Park (Vantage): Hike past 15-million-year-old petrified wood. Entry $11.50 per vehicle.
• Wild Horse Monument (Vantage): 18 life-size steel horses on a hill. Free, pull-off on I-90.
• Palouse Falls State Park (20 miles south of Washtucna): 200-foot waterfall in a remote canyon. $10 entry.

Cross into Idaho at Coeur d'Alene, then follow the Coeur d'Alene River valley. The Silver Valley mining district (Wallace, Kellogg) has the nation's largest Superfund site, but also the Route of the Hiawatha bike trail on a former railroad. In Montana, stop at the Grant-Kohrs Ranch National Historic Site in Deer Lodge (US-12) to see a 19th-century cattle ranch.

• Local commerce: Buy smoked salmon from the Yakama Nation at the Toppenish smokehouse. In Choteau, the High Country Art Gallery sells local pottery and cowboy gear.
• UNESCO connection: The route doesn't hit a World Heritage Site, but the nearby (70 miles from Choteau) Old Faithful in Yellowstone is a UNESCO biosphere reserve.

Fuel stops are plentiful along I-90 but sparse on US-287 north of Helena. Gas up in Missoula or Helena before heading to Choteau. Expect $4.50–$5.50 per gallon (2025 prices). Towing services are available in major towns; cell service drops between Drummond and Lincoln on US-287.

• I-90 from Ellensburg to Spokane: four-lane highway, 70 mph speed limit, rest areas every 30 miles.
• US-287 from Helena to Choteau: two-lane, 65 mph, limited shoulders. Watch for deer at dawn/dusk.
• Best gas stations: Shell in Vantage (last cheap gas before Spokane), Town Pump in Augusta (US-287).

The road surface is excellent on interstates, but US-287 has chip-seal sections. Snow is possible from October to April on Rogers Pass (I-90 east of Missoula) and on US-287 near Lincoln. Carry chains from October 1 to May 1. Summer construction zones are common, especially near George, WA and St. Regis, MT.

• Highest elevation: Lookout Pass (4,700 ft) on I-90 at the Idaho-Montana border.
• Lowest point: Columbia River at Vantage (500 ft).
• Wind advisory: The Columbia Gorge (Vantage area) can gust over 40 mph in spring.