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Counting down to Tuesday, September 22, 2026.
Astronomical fall in the Northern Hemisphere begins on September 22, 2026 — the autumnal equinox. Cooler air, shorter days, and pumpkin season is officially on.
Fast facts
- The autumnal equinox marks the start of astronomical fall in the Northern Hemisphere.
- Day and night are approximately equal across the planet on the equinox.
- Meteorological fall runs September 1 to November 30.
- In the Southern Hemisphere, this date marks the start of spring.