Tuesday July 23, 2024

United States flag Autumn 2025 in United States

Maple leaves in fall showing their red color.
September 2025
Su Mo Tu We Th Fr Sa

Labor Day
Monday September 1
1 year, 1 month, 9 days
or 405 days


Grandparents Day
Sunday September 14
1 year, 1 month, 22 days
or 418 days


Constitution Citizenship Day
Wednesday September 17
1 year, 1 month, 25 days
or 421 days


Monday September 22
1 year, 1 month, 30 days
or 426 days


Autumn Starts: Monday, Sep 22 2:19 pm EDT

Autumn Ends: Sunday, Dec 21 10:03 am EST

Region: Virginia/United States

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Astronomical Fall Dates

The first day of autumn often called fall (September equinox or autumnal equinox) is when the sun shines directly on the celestial equator passing from north to south and the length of day and night are almost the same. This is referred to as astronomical autumn or the September equinox.

Astronomical autumn starts at different times around the planet because of the different time zones as related to Coordinated Universal Time (UTC, same as Greenwich Mean Time based on the Royal Observatory in Greenwich, London [1]). For countries located west of UTC your autumn will start earlier than countries located east of UTC.

Astronomical and Meteorological Autumn

Astronomical Autumn is determined by the changing positions of the earth relative to the sun giving us the solstices and equinoxes. Seasons are caused by the tilt of the earth on its axis by 23.5 degrees. The tilt of the earth does not change as it goes around the sun so in the Northern Hemisphere the earth is tilted toward the sun in June and away from the sun in December[2]. When the sun is over the equator you have the equinoxes and when the sun is over the Tropic of Cancer in the most northern position you have the Summer solstice and conversely when the sun is over the most southern position over the Tropic of Capricorn you have the Winter solstice. The September equinox occurs in the Northern Hemisphere between the dates of September 21 to 23 followed by the Winter solstice - December 20 to 23 and then the March equinox - March 19 to 21 and then finally the Summer solstice - June 20 to 22. The United States, most of North America, Europe and many countries in the Northern Hemisphere use astronomical autumn to determine when autumn (fall) season officially starts and ends.

Meteorological Autumn is determined by the annual temperature cycles and the Gregorian calendar. Meteorological autumn starts September 1st in the Northern Hemisphere and lasts 3 months (September, October, and November) with Winter Season (December, January, and February) and Spring Season (March, April, and May) and finally Summer Season (June, July, and August). Australia and New Zealand in the Southern Hemisphere use meteorological autumn thus the months of March, April and May to determine their autumn season.

Autumn and the harvest go together with many cultural festivals centered around harvesting the fields during the autumn season. Thanksgiving is one of the more popular American federal holidays that celebrate the harvest with family and friends getting together to eat turkey and more.

1.”Greenwich Mean Time” - Wikipedia, wikipedia.org.
2.”Autumn and Earths tilt” - National Weather Service, weather.gov.

Name(s):Autumn, Fall, Autumnal Equinox, September Equinox
When:When:Astronomical - Sep 21st to 23rd
Meteorological - September, October, and December
(Northern Hemisphere)

Dates for Autumn

YearAutumn StartsAutumn Ends
Autumn 2023 Saturday, September 23 2023Thursday, December 21 2023
Autumn 2024 Sunday, September 22 2024Saturday, December 21 2024
Autumn 2025 Monday, September 22 2025Sunday, December 21 2025
Autumn 2026 Tuesday, September 22 2026Monday, December 21 2026
Autumn 2027 Thursday, September 23 2027Tuesday, December 21 2027
Autumn 2028 Friday, September 22 2028Thursday, December 21 2028