The first day of fall 2025 was Monday, September 22. This marks the autumnal equinox in the Northern Hemisphere, when day and night are roughly equal in length.

Astronomical vs. Meteorological Fall

Astronomical fall begins with the equinox around September 22 or 23 each year, driven by Earth's tilt and orbit. In 2025, it started at 2:19 p.m. EDT. Meteorological fall, used for weather statistics, kicks off September 1 to align with calendar months.

Why the Date Varies

The exact moment shifts slightly due to Earth's elliptical orbit and axial precession. For 2025–2030, here's the lineup:

YearFirst Day of Fall
2025Monday, September 22
2026Wednesday, September 23
2027Thursday, September 23
2028Friday, September 22
2029Saturday, September 22
2030Monday, September 23
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Fall 2025 Highlights

Fall ran until the winter solstice on December 21. Picture crisp air, vibrant leaves, and cozy vibes—perfect for pumpkin spice traditions that ramped up right after the equinox. In the Southern Hemisphere, it was spring's start instead.

TL;DR: September 22, 2025—straight from the equinox clockwork.

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