About a half-inch fell in Ada and Canyon counties Wednesday, but some areas had much more there was a report of 2 inches in Caldwell, according to the National Weather Service.
A winter weather advisory has been issued for the 48-hour period between Thursday and Saturday evenings.
Forecasters say about 5 inches will fall in the Valley between Thursday morning and Saturday afternoon. They expect the snow to be steady, with between 1 and 1 1/2 inches falling in each 12-hour period.
Idaho City will get 6 to 10 inches of snow, and higher elevations in the Boise mountains could see 1 to 2 feet of snow. The Owyhees could get up to 2 feet of snow.
Temperatures are expected to remain below freezing in the Valley at least through Friday night, leaving roadways snow-covered or icy. The low Thursday morning was a frigid 17 degrees, and the high for the day is expected to reach just 26.
The forecast high for Friday and Saturday is 34 degrees. By Saturday night, the precipitation will shift to rain or a rain-snow mixture, the weather service predicts.