Autumn 2025: When Does Fall Begin?

Countdown to Autumn 2025

The official start of autumn, also known as fall, in the United States in 2025 will be on Monday, September 22nd at 18:19 UTC (Coordinated Universal Time).

Autumn or Fall in Different Years

The exact date and time of the start of autumn varies slightly from year to year due to the Earth's orbit around the Sun. Here are the dates for the start of autumn in the United States in other years:

• 2024: Tuesday, September 23rd at 17:49 UTC
• 2026: Wednesday, September 23rd at 14:21 UTC
• 2027: Friday, September 24th at 02:05 UTC

Duration of Autumn

Astronomically, autumn lasts until the winter solstice, which occurs on Sunday, December 21st, 2025 at 07:04 UTC. This means that autumn 2025 will last for 89 days and 14 hours.