When Does Fall Start And End This Year. The first day of fall, or the autumnal equinox, can occur on sept. 22 or 23, the sun's rays shine directly over the earth's.

The autumnal equinox, or the first day of fall in the northern hemisphere takes place every year on september 22nd or september 23rd. Bear in mind that this only applies to the northern hemisphere—if you live south of the.