When Is Fall 2025. Usually, when we talk about the first day of autumn we are referring to the astronomical autumn which is defined by the earth's axis and orbit around the sun. The first day of fall 2025 is on monday, september 22, 2025 (in 267 days).
The first day of fall 2025 is on monday, september 22, 2025 (in 267 days). It can also happen in june!