How Many Sleeps Until First Day of Fall 2027?
First Day of Fall 2027 falls on Thursday, September 23, 2027.
First Day of Fall 2027 falls on Thursday, September 23, 2027, which is 335 sleeps away. A sleep count is the number of nights still to come rather than the number of days, which is why it is the version adults reach for when the person asking is a child — and why it stays intuitive long after the day count stops meaning much.
| Sleeps left | Morning of |
|---|---|
| 10 | Mon 13 Sep |
| 9 | Tue 14 Sep |
| 8 | Wed 15 Sep |
| 7 | Thu 16 Sep |
| 6 | Fri 17 Sep |
| 5 | Sat 18 Sep |
| 4 | Sun 19 Sep |
| 3 | Mon 20 Sep |
| 2 | Tue 21 Sep |
| 1 | Wed 22 Sep |
How a sleep count works
The convention: one sleep means one night still to go. On the morning before, the answer is one. On the morning of the day itself, it is zero — you have run out of nights to sleep through. Because it tracks nights rather than 24-hour periods, the figure can read one higher than the day count for an event that lands in the morning.
About First Day of Fall 2027
The september equinox of 2027 falls on September 23, 2027 at 05:56 UTC — the astronomical start of fall in the Northern Hemisphere (spring below the equator).
Astronomically, this is the Sun crosses the equator heading south — spring in the Southern Hemisphere. It is also the day the tide of daylight turns: after the September solstice the change is barely minutes per week, then accelerates — the reason the weeks after a solstice feel darker (or lighter) faster than the solstice day itself.
Quick facts
| Exact moment (UTC) | September 23, 2027 · 05:56 |
|---|---|
| Event | September Equinox |
| Hemisphere note | Seasons flip in the Southern Hemisphere |