In most of the Northern Hemisphere, “fall” usually means the season from early September through late November.

Two common definitions

  • Meteorological fall : September 1 to November 30.
  • Astronomical fall : From the autumnal equinox (around September 22–23) to the winter solstice (around December 21).

Many people casually think of fall as “September, October, November,” even if the strict astronomical dates run a bit later into December.

If you’re in the Southern Hemisphere

The dates are flipped: fall runs roughly from March to May, tied to the March equinox and June solstice in that half of the world.

So, if you’re asking “when is it fall?”: in the U.S. and much of Europe, people generally start calling it fall once September hits, with the “official” start often marked by the autumn equinox later in the month.

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