What Date Is First Day Of Winter 2024. So, what is the winter solstice, and why does it happen? The winter solstice, which marks the first day of winter 2024, occurs on saturday, december 21, 2024 at 4:21 a.m.
Spring begins with the vernal equinox, tuesday, march 19, 2024, 11:06 p.m. When is the first day of winter?