When Is First Day Of Winter 2025. Winter 2025 starts on sunday, december 21st in the northern hemisphere, with the first day of winter being the shortest daylight day of the year with the earth's axis having reached its furthest tilt away from the sun and. Winter begins with the winter solstice, sunday, december 21, 2025, 10:03 a.m.

Winter 2025 starts on sunday and ends on friday. The first day of spring is thursday, march 20, starting at 5:01 a.m.