In Idaho's Blaine County, the sheriff's office said on Facebook that deputies were dealing with stuck vehicles in the state's high country after 10 inches of snow were reported north of Galena Summit.
The sheriff's office also had blunt words over the frosty conditions, joking that a felony warrant had been issued for Mother Nature for "illegal dumping."
"If you see her please show her a calendar. She thinks it's Junuary," the sheriff's office said.
Around 6 inches of snow was reported south of Galena Summit as the storm system moved through.
Photos released by the sheriff's office showed some vehicles stuck on roadways and trying to navigate high-elevation passes.
The National Weather Service (NWS) office in Boise showed images from Bogus Basin and Redfish Lake as snow coated the area.
Mountain passes across southwest Montana and central Idaho, however, saw several inches of heavy, wet snow.
Winter weather conditions caused the Beartooth Pass on U.S. Highway 212 to close between Wyoming and Montana for several hours as the heavy snow fell, according to the Billings Gazette.
Lower elevations just saw rain and patchy fog.
The snow came a little more than a week after another storm dropped up to a foot of snow in the same high-elevation spots of the region.
Forecasters said the system behind the blast of winter is moving east, and will threaten the northern Plains and Upper Midwest over the rest of the week.