The first day of fall in 2024 is Sunday, September 22.

Quick scoop

  • Astronomical fall begins at the autumnal equinox, which in 2024 occurs on September 22.
  • The equinox happens in the morning, at about 8:43–8:44 a.m. Eastern Time.
  • Meteorologists sometimes treat September 1 as the start of “meteorological fall” for record-keeping, but the official first day of fall is the equinox on September 22.

In everyday use, when people ask “when is the first day of fall in 2024,” they almost always mean the autumnal equinox on Sunday, September 22.

TL;DR: Mark your calendar for Sunday, September 22, 2024, as the first day of fall in the Northern Hemisphere.

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