First Day Of Winter 2024 Date And Time Calendar. The first day of winter is marked by the winter solstice, which occurs when the earth’s axis tilts farthest from the sun. It depends on how you define winter.
The first day of winter is marked by the winter solstice, which occurs when the earth’s axis tilts farthest. Here are the equinox and solstice dates—plus, answers to common questions about the seasons of the year in north america.