Four feet (120 cm) of snow fell in the town of Browning, near Glacier National Park in Montana, from Friday to Sunday.
On Saturday snow was recorded at Missoula International Airport, the first time snow was measured there on a September 28 date since 1893.
Storm winds and blizzard conditions were forecast to continue through Monday in parts of Montana, California, Oregon, Washington, Idaho, Nevada and Utah.
At least eight Montana school districts cancelled classes on Monday due to the heavy snowfall
Montana Gov Steve Bullock declared an emergency Sunday due to heavy snow on the first weekend of fall