First Day Of Winter 2024 Date And Time Of Day. When is the first day of winter? The winter solstice, which marks the first day of winter 2024, occurs on saturday, december 21, 2024 at 4:21 a.m.

Winter begins on saturday, december 21, 2024—also known as the winter solstice. The first day of winter is marked by the winter solstice, which occurs when the earth’s axis tilts farthest from the sun.