What Is The First Day Of Winter 2024. Find the average date of the last light freeze in spring or the first light freeze in fall for your location based on historical climate data. It marks the shortest day and longest night of the year and the first day of the winter in.

These dates are based on the astronomical seasons, which depend on the winter solstice and the spring equinox. Learn when winter starts and ends in canada based on the astronomical seasons defined by the movement of the sun.