NWS Forecast Office Spokane, WA

The first significant mountain snow of the season is forecast to arrive Sunday into Monday morning, impacting elevations above 3,000 feet across northern Idaho, the Cascades, and the northern mountain ranges. The greatest snowfall amounts—up to 8 to 12 inches—are expected along Highway 20 passes, including Washington Pass and Sherman Pass. Drivers should be prepared for slick, untreated roads, and anyone planning outdoor activities should be ready for cold temperatures in the 20s and 30s. Winter driving conditions could develop quickly, so stay weather-aware and check the latest forecasts before heading into the mountains.