Official Start Of Winter 2024 Usa. Winter solstice is the shortest day of year, longest night of the year and the official first day of winter in the northern hemisphere. The winter solstice, which marks the first day of winter 2024, occurs on saturday, december 21, 2024 at 4:21 a.m.

Learn what causes this change in seasons and winter solstice traditions from around the. The next change of season will take place on december 21, 2024 (1st day of winter).