Here is a breakdown of what months constitute autumn in the USA and what you can expect during each one.

To answer the question directly:

While the simple answer is that autumn takes place during , the full answer is a bit more nuanced. In the USA, the season is defined by two different calendars: the astronomical calendar (which dictates the equinox) and the meteorological calendar (used by weather scientists).

It is important to remember that the USA covers a vast area.