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When is First Day of Fall 2026?
First Day of Fall 2026 is on Tuesday, September 22, 2026 — that's 128 days (18 weeks) from today.
Below you'll find the exact date, the day of the week, a live countdown, and everything you need to plan ahead — plus a free iPhone widget that keeps First Day of Fall on your home screen.
128
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First Day of Fall
Outside
Free iPhone app with home screen widgets. Used by 300k+ people.
Date details for First Day of Fall 2026
- Day of week: Tuesday
- Full date: Tuesday, September 22, 2026
- Days remaining: 128
- Weeks remaining: 18
First Day of Fall 2026 is on Tuesday, September 22, 2026. That is 128 days away — about 18 weeks and 2 days, or roughly 4 months, from today. First Day of Fall is an astronomical season that begins at a solstice or equinox, the precise moment Earth's tilt reaches a turning point. First Day of Fall falls on a Tuesday this year, a midweek date — worth noting if you want to plan time off around it.
Counting down turns a vague "soon" into a clear number of days you can plan around — booking travel, sending cards, or simply building anticipation. Many people begin preparing for a date like this two to three months ahead, and a visible countdown helps pace that preparation rather than leaving everything to the final week. If you are counting down to First Day of Fall, you can add a free Outside countdown widget to your iPhone home screen; it updates every day and can be shared with friends and family.
Looking for First Day of Fall 2027?
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Open page →About First Day of Fall
The first day of Fall (Autumn) 2026 is Tuesday, September 22nd.
History & Significance
This date marks the Autumnal Equinox in the Northern Hemisphere.
The Science Behind First Day of Fall
Seasons are driven by the tilt of Earth's axis — roughly 23.5 degrees — not by how close the planet is to the Sun. As Earth orbits, each hemisphere leans toward or away from the Sun, changing the angle of sunlight and the length of the day. The astronomical start of a season is pinned to a solstice or an equinox, the precise moment that geometry reaches a turning point.
That is why the start of First Day of Fall 2026 lands on a specific date and even a specific time, rather than the first of a month. Equinoxes bring near-equal day and night worldwide; solstices mark the longest or shortest day of the year. Knowing the exact changeover is useful for gardeners, photographers, and anyone tracking daylight hours.
First Day of Fall 2026: Frequently Asked Questions
When is First Day of Fall 2026?
First Day of Fall 2026 is on Tuesday, Tuesday, September 22, 2026 — 128 days from today. You can track it with a free countdown widget on your iPhone home screen using the Outside app.
What day of the week is First Day of Fall 2026?
First Day of Fall 2026 falls on a Tuesday. Knowing the weekday helps you plan time off, travel, or weekend activities around the date.
How long until First Day of Fall 2026?
First Day of Fall 2026 is 18 weeks away — roughly 5 months from now. That's plenty of time to plan ahead.
Is there a free First Day of Fall countdown app?
Yes. Outside is a free iPhone app with a First Day of Fall countdown widget for your home screen, plus reminder alerts and calendar sync. Used by 300k+ people.
What causes First Day of Fall to begin?
First Day of Fall begins because of the 23.5-degree tilt of Earth's axis. As the planet orbits the Sun, each hemisphere leans toward or away from it, changing sunlight and day length. The season's astronomical start is pinned to a solstice or equinox.
Is the start of First Day of Fall the same date every year?
Not exactly. Because the solstice and equinox follow Earth's orbit rather than the calendar, the start of First Day of Fall can shift by a day or two from year to year. 2026 has its own precise changeover date and time.
What is the difference between meteorological and astronomical First Day of Fall?
Meteorological seasons are fixed three-month blocks used by forecasters, while astronomical seasons are defined by solstices and equinoxes. The date counted here is the astronomical start of First Day of Fall 2026.
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