Autumnal Equinox 2020: The First Day of Fall

Facts & Folklore About the Fall Equinox

December 29, 2019
Autumnal Equinox - Fall Road

In 2020, the autumnal equinox—also called the September equinox or fall equinox—arrives on Tuesday, September 22. Fall begins in the Northern Hemisphere and spring begins in the Southern Hemisphere. Why do we mark the equinox? Here’s all you need to know!

Autumn has caught us in our summer wear.
–Philip Larkin, British poet (192286)

When is the Autumnal Equinox?

The fall equinox arrives on Tuesday, September 22, 2020 at 9:31 A.M. EDT. The equinox occurs at the same moment worldwide; your clock time depends on your time zone.

Year Autumnal Equinox (Northern Hemisphere)
2019 Monday, September 23
2020 Tuesday, September 22
2021 Wednesday, September 22
2022 Thursday, September 22

What is the Autumnal Equinox?

Autumn days come quickly, like the running of a hound on the moor.
Irish proverb

The autumnal equinox—also called the September or fall equinox—is the astronomical start of the fall season in the Northern Hemisphere and the spring season in the Southern Hemisphere.

What is an Equinox?

The word “equinox” comes from Latin aequus, meaning “equal,” and nox, “night.” On the equinox, day and night are roughly equal in terms of length. (See more about this below.)

During the equinox, the Sun crosses what we call the “celestial equator”—an imaginary extension into space of Earth’s equator line. The equinox occurs precisely when the Sun’s center passes through this line. When the Sun crosses the equator from north to south, this marks the autumnal equinox; when it crosses from south to north, this marks the vernal equinox.

After the autumnal equinox, the sun is rising later and nightfall comes sooner. This ends with the December solstice, when days start to grow longer and nights shorter.

Fall bridge

Fall Weather

It is the summer’s great last heat,
It is the fall’s first chill: They meet.

–Sarah Morgan Bryan Piatt

Another definition of fall is “nights of below-freezing temperatures combined with days of temperatures below 70 degrees Fahrenheit (21°C)”. From here on out, the temperatures begin to drop.

Will fall bring crisp, cool weather—or, unseasonably warm weather? It depends on where you live! Find out the forecast for your area in The Old Farmer’s Almanac!

Fall Foliage

Note that fall foliage isn’t due to current weather conditions. This is a common misconception. Leaves change color because of the amount of daylight and photosynthesis. Learn more about autumn leaves.

Japanese maple leaf in fall

Fall Equinox FAQs

Q: Are Day and Night Perfectly Equal on the Equinox?

A:  As say that during an equinox, day and night is equal. Well, not exactly. It depends where you live.

On the equinox, the center of the Sun is indeed above the horizon for 12 hours. However, “sunrise” is said to begin when the upper edge of the Sun’s disk becomes visible above the horizon (which happens a bit before the center rises) and ends when the entire Sun has set. In this case, daylight is still a bit longer than nighttime. 

Not only that, but the Sun is actually visible when it is below the horizon, as Earth’s atmosphere refracts the Sun’s rays and bends them in an arc over the horizon. Yes, you can see the Sun before the edge actually reaches the horizon! This causes daylight to be longer than 12 hours as well.

However, they are very close to equal (the lengths may be off by only a few minutes). 

Did you know our rise/set tool now provides day length? In Dublin, New Hampshire—home of The Old Farmer’s Almanac—our day length on the equinox is 12:08 hours.

See our Sunrise/set calculator for day length in YOUR area.

Q: Is the Autumnal Equinox Really the First Day of Fall?

A: Based on the astronomical definition of seasons, yes, the autumnal equinox does mark the first day of fall (in the Northern Hemisphere). However, according to the meteorological definition of seasons, which is based on temperature cycles and the Gregorian calendar, the first day of fall is September 1.

Q: Can You Balance An Egg On the Equinox?

A: There’s an old-wife’s tale that you can stand an egg on its end of the equinox. Well, yes, it’s true (and fun to try). But it’s not only on the equinox. See more about equinox facts from Almanac astronomer, Bob Berman.


Signs of Fall

What are your local signs of fall? In many regions of the Northern Hemisphere, the landscape silently explodes with vibrant colors of red, yellow, and orange. The leaves begin to drop off the trees, providing endless hours of jumping into leaf piles for kids and raking them back up for parents!

Trees snapping and cracking in the autumn indicate dry weather.

Fall also brings some wonderful holidays, including Halloween and Thanksgiving, which carry us through the season until temperatures begin to drop, nights begin to get longer, and all the woodland critters start storing up for the long haul of winter

And don’t forget about the end of Daylight Saving Time, when we “fall” back, setting our clocks back one hour and regaining an hour of precious sleep!

Plants and trees are slowing down, as sunlight decreases, to get ready for the colder season ahead. In the garden, asters and chrysanthemums bloom beautifully as orange pumpkins and corn mazes abound.

Football season is warming up and so is sweater weather.

Also notice the arc of the Sun across the sky each day as it starts shifting south. Birds and butterflies migrate along with the path of our Sun!

Of course, you can you can easily notice the later dawns and earlier sunsets. See our sunrise/set tool for your area!

Purple Aster
Aster flowers

Ancient Autumn Traditions 

The fall equinox has been a day of celebration for cultures since ancient days. People tracked the transitions of the Earth’s journeys around the Sun.

  • At Machu Picchu in Peru, an ancient stone monument called Intihuatana—which means “Hitching Post of the Sun”—serves as a solar clock to mark the dates of the equinoxes and solstices.  
  • In Mexico, the Mayans built a giant pyramid called Chichen Itza. On the equinoxes, it looks as if a snake made of light slithers down the pyramid’s steps.
  • In England, Stonehenge was also built with the equinoxes and solstices in mind.

See Five Ancient Sites Aligned With the Equinoxes and Solstices.

Enjoy Autumn!

Wishing a colorful, cool, cozy autumn to all our Almanac readers. Tell us your favorite things about the fall season below!

To learn more about all four seasons and see when they begin, see First Day of Seasons.


Reader Comments

Leave a Comment

I love your idea of reading

I love your idea of reading outside in the autumn light! I hope you get to enjoy many gorgeous days all cozy in your warm blanket! I love coffee too and it seems to taste and smells better in the fall and winter! Have you ever googled 'autumn quotes'? There's several good websites with beautiful poems and thoughts that I think you'd love! Happy Autumn 2014!!

I couldn't agree with you

I couldn't agree with you more, i think autumn is so magical from tree leaves changing colors, the chilly mornings and evenings, to the smell of cinnamon and spice. I can't wait for autumn to start here in SC!!!

Hey Marybeth Shipley, try

Hey Marybeth Shipley, try breaking your Prozacs in half for now on. Fall is as exciting or boring as any other season.

I LOVE the fall! It's the

I LOVE the fall! It's the start of all the wonderful holidays and gets my family geared up for Thanksgiving and Christmas. This truly is the start of the most wonderful time of the year!!

I agreed with you is a

I agreed with you is a wonderful feeling

autumn is colorful but sad to

autumn is colorful but sad to see the summer pass.

I know a lot of people love

I know a lot of people love the summer I live in California and I just can't handle the heat, sometimes it gets sticky and I really love the fall season because I know the relief is on the way

Agreed. Summer was great

Agreed. Summer was great when I was a kid (& for kids now), but I don't care for it (as an adult). I always look forward to fall...cooler weather & football and hunting season.

I love the fall season.

I love the fall season. Summer in the south is misserable. It would be nice to have fall and winter only.

Why did you Americans change

Why did you Americans change the name of Autumn to "fall"
Actually I am trying to find the right dates when the seasons start. I reckon 21/3 etc but here in NZ they reckon the 1st of the month.

from Wikipedia: The

from Wikipedia:

The alternative word "fall" for the season traces its origins to old Germanic languages. The exact derivation is unclear, with the Old English fiæll or feallan and the Old Norse fall all being possible candidates. However, these words all have the meaning "to fall from a height" and are clearly derived either from a common root or from each other. The term came to denote the season in 16th century England, a contraction of Middle English expressions like "fall of the leaf" and "fall of the year".[12]

During the 17th century, English emigration to the British colonies in North America was at its peak, and the new settlers took the English language with them. While the term fall gradually became obsolete in Britain, it became the more common term in North America

The name Fall is actually a

The name Fall is actually a very old English term for Autumn. t was used in the UK in medieval times, before the Americas were discovered. It was us Brits who changed it to autumn!

My birthday is on the spring

My birthday is on the spring equinox and my sisters is on the fall equinox. We do not get along,never have. Does us not getting along have to do anything with our birthdays?

I don't think the saason has

I don't think the saason has nothing to do with you or your sister maybe you don't get alone because you have your dads personality and your sisters your moms

Its my belief that the

Its my belief that the seasons,moon& sun changes all play a role in both personality and behavior. Working in health care I have seen this first hand.

I was born on the cusp Dec.

I was born on the cusp Dec. 21 and do not get along with Geminis who are my polar opposite. Sag/Caps have this problem sometimes. Don't know about spring equinox though.

my birthday is on the same

my birthday is on the same day as when Autumn begins :D

Well, here in upstate NY

Well, here in upstate NY state, I'm wondering why the leaves are still 99% green and we're still having beautiful days in the mid 70's. I'm not complaining but I'm wondering what the old wives tales say about this; does it mean we're going to have a dreadful winter? Autumn is pretty but I have to admit a feeling of dread and sadness every autumn. I HATE cold weather and winters here are just plain awful; not my cup of tea, but I guess there are people who love winter. Even though it's still cold in the spring, to see all the nature coming back to life and becoming green is just an uplifting feeling! Sometimes I wish I could move to a place where it's beautiful warm weather all year, with no earthquakes, hurricanes, tornadoes, floods, extreme heat, etc. Is there such a place on earth?

Dear Ms. Taratuchin,

Dear Ms. Taratuchin,
Yes, I am sure there is a place on some island. New Zealand is a nice place. And Arizona is nice in the winter with none of the things you said, such as hurricanes. They can have dust storms, but mostly in the more desolate desert up in Phoenix and they can have floods, but the Southern Arizona has been in a drought for about 10 years, though they can some rain in the summer.


I live in arizona as well.

I live in arizona as well. And let's face it there's no such thing as autumn or spring here. It's either hot, cold, or we are having crazy amounts of rain and dust storms with the occasional tornado that happens like never. And it may not get as cold as some places like New York but it gets pretty cold here. People just assume that because it's a desert it's always hot, but that would be false. In some places it can get to 0° or lower, but mostly at night. The lowest I've seen it get here in the valley is about 20° but I think the record low here in Phoenix is 16°. And it can get as hot as 122° in Phoenix as well. And the record high for Arizona is 128° I believe. But like I said there really are only 3 seasons here winter summer and monsoon season.

Alexandra, My sentiments

My sentiments exactly! Love autumn but dread what follows. As I was taking my brisk walk this a.m. I found myself having mixed emotions about the scenery unfolding before me. On the one hand, I found the colorful foliage quite beautiful and uplifting, on the other, sad because I know what's coming after this season. Then I reminded myself; "Stay in the moment". I do not want to miss out on my enjoyment of this perfectly gorgeous change occurring because I am anticipating another dreadful winter. I felt better.

A friend of mine does a

A friend of mine does a seasonal autumn spread on her website. Nice fall pictures:

yes its called heaven !!!

yes its called heaven !!!

That was my answer, also!

That was my answer, also! Heaven...

Yeah i think so. Its our

Yeah i think so. Its our country, Maldives.The sunny side of life.

Suriname a nice country in

Suriname a nice country in South America.

I'm from Upstate NY as well

I'm from Upstate NY as well and I completely agree with you. Autumn is pretty but only for a short time. Summers here are not long enough and spring really begins a month late. Winters here are long, dark, cold, and never seem to end. I hope someday that I am in the position to move someplace where summers are hot and winter is scarce.

North Central AZ! I am

North Central AZ! I am originally from Cooperstown, NY. Hated the cold. Went Vegas. Hated heat. Now in Cottonwood AZ. A little heat but short and not that bad. Cold is maybe an hour or two of freezing and then warm days. Perfect climate, lots of farming, green, trees and heaven. No earthquakes, tornadoes, hurricanes but a minor flood once in a while in the summer monsoon.
Fall here is gorgeous. High 80s day high 50s night. See the stars and no pollution to clog the lungs.

I think autumn is awesome in

I think autumn is awesome in Texas, during summer it will NEVER go under 73 degrees but during fall its only 60-85 degrees. Also my b-day is in fall. I also kinda like the feel of shorter days so its darker when i sleep and my eyes dont burn of sunlight in the morning.

I love early spring, when the

I love early spring, when the leaves are that bright, bright green and I actually feel growing sadness as the summer goes by and they turn that dull, grayish green. I know that means winter is coming. See what I did there? I jumped right over Autumn! I do love the colors and smells of Autumn, but it's way too short. One good downpour and the color is gone, leaving bare dead-looking branches and chill. I guess it's best to make the best of what we are given and try to find joy in each season in turn. That being said, ever since I was a child ( too many years ago to mention) I have cried at the first snowfall. I can't help it. Perhaps I am grieving the passing of another bright, sunny time. I live in NY state, where winter seems endless.