Generally, September 22.
north american fall months
October.
1 September
In North America, people typically refer to Autumn as "fall."
Spring
Autumn.
In North America, fall is mostly called fall, and sometimes autumn.
When it is fall (autumn) in southern latitudes it is spring in northern latitudes.
When it is spring in Paris it is autumn in Australia.
In North America, it occurs from September to November. In South America, it occurs from March to May.
It never did begin
panama is where north America ends and Columbia is where south America begins.
North America, South America and Europe
The first day of Autumn/Fall is September 22nd.
Australia is south of the equator, so seasons are reversed from those in North America. Summer in America is winter in Australia. Spring in Australia is autumn in America.