Conversions
How Many Days Until Fall?
Last updated: May 31, 2026
Written by Blake Boege
An astronomical countdown tool that calculates the duration until the next Fall Equinox (first day of Autumn) and displays a live ticking countdown in days, hours, minutes, and seconds.
View the live countdown to the first day of Fall. Find out exactly how many days, weeks, hours, and seconds are left until September 22.
Quick Answer
Find the exact count of days remaining until the next Fall Equinox (September 22) computed live.
Loading live countdown...
Examples
Autumn Equinox Date
September 22 (Approx.)
Equinox Event
Astronomical Event
How it works
The live timer computes the differences between now and September 22 in local timezone milliseconds:
Countdown · Days = (September 22 - Today) / 86,400,000
How the Days Until Fall are Calculated
To calculate the number of days until the start of fall, find the difference in milliseconds between the equinox target date (September 22 at midnight) and the current local system date. Since the autumn equinox occurs annually, if September 22 of the current year has already passed, the calculation shifts to next year's September 22 date.
Math: (Target Date Time − Current Time) in Milliseconds ÷ 1,000 ÷ 60 ÷ 60 ÷ 24 = Days Remaining
Astronomical vs. Meteorological Seasons
Seasons can be divided in two ways:
- Astronomical Fall: Starts on the autumn equinox (September 21–23) and ends on the winter solstice (December 20–22). This is governed by the Earth's tilt relative to the sun.
- Meteorological Fall: Defined by climatologists as the three transition months: September, October, and November. It begins on September 1 and ends on November 30.
Related Date & Holiday Countdowns
Explore our other dynamic date and seasonal countdown tools:
- How Many Days Until Summer? — count down to the summer solstice (June 21).
- How Many Days Until Spring? — count down to the spring equinox (March 20).
- How Many Days Until Halloween? — track the next October 31.
- Countdown to Any Date — calculate days until any custom target date.
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Frequently asked questions
In the Northern Hemisphere, fall (autumn) starts on the autumn equinox, which typically falls on September 21, September 22, or September 23. For common calendar tracking, September 22 is widely used as the general start date.
The autumn equinox is the moment when the sun crosses the celestial equator from north to south. This marks the day of the year when daylight and night hours are nearly equal all over the world.
Divide the remaining days by 7 to determine the number of weeks. For example, if there are 70 days left, it is exactly 10 weeks until September 22.
In the Southern Hemisphere, the seasons are reversed. Fall starts on the March equinox (approx. March 20), while September 22 marks the beginning of spring.
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