Winter Solstice 2024 Time Est. The winter solstice, which marks the first day of winter 2024, occurs on saturday, december 21, 2024 at 4:21 a.m. The winter solstice — the exact moment when the sun appears farthest south in the sky — happens at 4:20 a.m.

The winter solstice marks the shortest day and longest night of the year. The shortest day of the year, in terms of daylight, is december 21, the winter solstice.