Boise, Idaho – A colder and increasingly active winter pattern is expected to dominate Idaho as the New Year approaches, with strong signals for widespread mountain snow, valley impacts, and hazardous travel from Dec 27 through Jan 9.
Large-scale atmospheric patterns favor repeated Pacific storm systems pushing inland across the Northwest during this period. According to the National Weather Service, cold air is expected to remain readily available across Idaho, allowing most systems to produce snow at higher elevations and, at times, across lower valleys. Central and northern Idaho currently show the strongest signal for frequent accumulating snowfall, while southern valleys including the Boise area may see snow during colder system phases.
Mountain zones, including the Sawtooth Range, Salmon River Mountains, and Bitterroots, are expected to see repeated rounds of heavy snow. Travel routes such as I-84 through southern Idaho, US-20 near Mountain Home, US-95 through central Idaho, and mountain passes along ID-21 and ID-55 could experience snow-covered roads, reduced visibility, and temporary closures during stronger storms.
Snowfall is expected to occur in multiple waves rather than one prolonged event, increasing the likelihood of recurring travel disruptions through early January. Gusty winds accompanying some systems may lead to blowing snow, especially in exposed mountain areas, further reducing visibility and increasing avalanche concerns in backcountry terrain.
The Idaho Transportation Department urges motorists to monitor road conditions closely, carry winter emergency supplies, and allow extra time for holiday travel. Residents are encouraged to prepare for colder temperatures, protect exposed pipes, and limit non-essential travel during active snow periods.
While brief breaks between storms are expected, the overall setup supports a snowy and impactful start to 2026 across Boise and much of Idaho, with winter weather hazards continuing into early January.
