The first day of fall in 2025 in the Northern Hemisphere was Monday, September 22, 2025.

Quick Scoop

  • Astronomical fall 2025 began with the autumnal equinox on September 22, 2025.
  • The equinox occurred at about 18:20 GMT, which lines up with mid‑day to afternoon in U.S. time zones (for example, around 2:19 p.m. Eastern time).
  • Fall then runs from that date until the winter solstice on December 21, 2025, in the Northern Hemisphere.

Many forums and seasonal blogs also treat early September (like September 1) as the “vibes” start of fall, but officially, by the equinox, fall had definitely begun.

Information gathered from public forums or data available on the internet and portrayed here.