First Day of Fall | Britannica - Fist day of fall
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Find out the dates of the first days of spring, summer, fall, and winter. When do the four seasons—winter, spring, summer, and fall—start? Here are your. In , the autumnal equinox—also called the September equinox or fall equinox—is Monday. On this day, fall begins in the Northern Hemisphere and spring begins in the Southern Hemisphere. In , the autumnal equinox occurs on Monday, September 23 at UTC.