Beginning Of Winter 2025. Fall starts at the moment when the sun is directly over the equator, going from north to south: Begins on saturday, june 1st, and ends on saturday, august 31st.
If the astronomical or calendrical seasons begin with the equinoxes (spring and autumn) and solstices (summer and winter), in meteorology, they begin earlier. The winter solstice is the shortest day and the longest night of the year.