Weather
Idaho November Weather Nov. 5-11: Snow Could Reach Mountain Passes
Boise, ID – Idaho's mountain highways are entering a period when winter conditions can develop quickly, even while lower elevation cities experience relatively mild autumn weather. Snow, freezing temp
By Cameron Hayes · 2026-10-29T07:32:54.976Z
Boise, ID – Idaho's mountain highways are entering a period when winter conditions can develop quickly, even while lower elevation cities experience relatively mild autumn weather. Snow, freezing temperatures and icy roads are becoming important considerations for travelers heading into the state's northern and central mountains.
The first full week of November brings particular attention to routes crossing high terrain, where temperatures can differ sharply from nearby valleys.
According to the National Oceanic and Atmospheric Administration's Climate Prediction Center, its outlooks issued Wednesday, Oct. 28, cover Thursday, Nov. 5, through Wednesday, Nov. 11, and provide broad temperature and precipitation probabilities.
Those outlooks do not establish a specific Idaho snowstorm or predict accumulating snowfall at individual highway passes.
Northern Idaho Faces Early Winter Exposure
Communities around Sandpoint, Bonners Ferry and Wallace typically experience colder early November conditions than Boise and the Treasure Valley.
Interstate 90 near Lookout Pass is particularly exposed to winter weather because of its elevation and mountain terrain.
Snow can develop along the route when sufficiently cold air and moisture arrive together, potentially creating conditions different from those at lower elevations.
Central Mountains and Eastern Idaho
Farther south, the Sawtooth Mountains and communities around Stanley and Ketchum can experience freezing temperatures and early season snowfall.
Mountain routes such as Idaho Highway 75 near Galena Summit are also vulnerable to changing winter conditions.
Eastern Idaho communities including Idaho Falls, Rexburg and Driggs can experience colder nights and occasional early season snow, depending on individual weather systems.
Meanwhile, Boise, Nampa and Caldwell generally have a lower early November snowfall risk than Idaho's higher elevations.
What Drivers Should Know
The available NOAA outlook does not provide specific snowfall totals, road closure forecasts or confirmed snow timing for Nov. 5 11.
For travelers, elevation and updated local forecasts will matter more than broad statewide temperature trends.
Drivers should check National Weather Service forecasts and Idaho 511 road conditions before crossing mountain passes.
Mountain snow remains a credible seasonal concern, but a specific November 5 11 snow event has not been confirmed.