Fall 2025 starts on Monday, September 22, 2025 in the Northern Hemisphere, which is the date of the autumnal equinox that year.

Quick Scoop: Key dates for fall 2025

  • Astronomical fall (official “first day of fall”) : Monday, September 22, 2025.
  • Meteorological fall (used by weather services) : runs from September 1 to November 30, 2025, so some people treat September 1, 2025 as the start of fall for climate/statistical purposes.
  • End of fall 2025 (astronomical) : Sunday, December 21, 2025, when winter begins.

Two ways people say “when is it fall 2025?”

  • “Calendar/weather fall” : many forecasts and climate records define fall as September, October, and November, so they’ll say fall 2025 runs from September 1 to November 30.
  • “Space/earth-sun fall” : astronomers and many calendars mark the start when the sun crosses the celestial equator heading south (the autumnal equinox), which is September 22, 2025.

Simple example

If you’re planning:

  • A “first day of fall” celebration or social media post → use September 22, 2025.
  • Seasonal stats like “fall 2025 rainfall” → those usually cover September 1 to November 30, 2025.
Information gathered from public forums or data available on the internet and portrayed here.