The start of fall (autumn) in 2025 in the Northern Hemisphere, according to the astronomical definition, is on Monday, September 22, 2025, at 2:19 pm EDT (18:19 UTC). This marks the autumnal equinox when day and night are nearly equal in length. The fall season then continues until the winter solstice in December. Meteorologically, fall is often considered to start on September 1 and run through November 30, but the astronomical equinox date is the more precise marker for the start of fall.