What Day Is The First Day Of Winter 2024. So, what is the winter solstice and why does it happen? This is also the official first day of the winter season, which will last until the spring equinox on.
The first day of winter is marked by the winter solstice, which occurs when the earth’s axis tilts farthest from the sun. By the time we reach the summer solstice on june 20, 2025, it will be the longest day of the year.