National Weather Service United States Department of Commerce

The first Winter Weather Advisory for the northern mountains of Colorado is out, including Summit County. 6-12" of snow is expected above 9,500 feet, with the heaviest snowfall occurring Wednesday afternoon through Wednesday night. Lighter snow accumulations will occur on valley floors and the higher foothills. The snow will taper off Thursday morning, but slick and hazardous travel may remain into the Thursday morning commute.
The first impactful mountain snow of the season is heading for the mountains. We'll see showers increase through this evening and continue overnight, with some slush possible on the highest passes into early Wednesday morning. The heaviest snow and more significant travel impacts can be expected Wednesday afternoon through early Thursday morning, with travel impacts gradually lowering to potentially around 8,500 feet. Be prepared for the season's first meaningful snowfall in the high country. Chain and traction laws may be in effect.