Snowfall is common and often heavy across the northern tier and mountainous areas of the contiguous United States. Key regions:
Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, Connecticut, New York, Pennsylvania
Michigan, Wisconsin, Minnesota, North Dakota, South Dakota, Nebraska, Iowa, Illinois, Indiana, Ohio
Montana, Idaho, Wyoming, Colorado, Utah, Nevada, Arizona (high country), New Mexico (high country)
Washington, Oregon (especially Cascades and eastern slopes)
Southern states rarely see snow except at high elevations or during rare cold snaps. Alaska, of course, has extensive winter snow cover statewide.