Autumn officially begins at 7:21 A.M. (PT) and marks the transition from summer into winter.

Labor Day in the United States is a public holiay celebrated on the first
Monday in September. It honors the American labor movement and the
contributions that workers have made to the strength, prosperity, and
well-being of the country. It is considered the unofficial end of summer.

In 1887, Oregon was the first state of the U.S.to make it an official public
holiday. By the time it became an official federal holiday in 1894, thirty U.S.
states officially celebrated Labor Day.