when is fall 2025

Fall (the autumn season) in the Northern Hemisphere in 2025 starts on Monday, September 22, 2025, at the moment of the autumnal equinox. It ends on Sunday, December 21, 2025, at the winter solstice. This is the astronomical definition of fall based on the Earth's position relative to the Sun. Meteorologically, fall is often defined as the three months of September, October, and November, starting on September 1 and ending on November 30, but the astronomical fall dates for 2025 are September 22 to December 21.