When Is The First Day Of Winter 2024 Usag. 21, marking the official beginning of winter and ushering in the season’s characteristic cold fronts and holiday traditions. The first day of winter in the northern hemisphere is marked by the winter solstice, which occurs on saturday, december 21, 2024, at 4:21 a.m.

This year, the solstice happens at 4:21 a.m. The northern hemisphere winter solstice will occur saturday, december 21st at 4:20 am est.