There are only 2 years in the 2000-2099 range where fall starts on September 21st. 20922096 I thought this sounded unusual. Doesn't fall typically start on September 21? Nope. Do you know when was the last time fall started on September 21? The year 1000... Over 1000 years ago. (Fall this year in the northern hemisphere begins on Tuesday, September 22 at 17:05 PT.) #FallEquinox