October is the tenth month of the year in the
Julian and
Gregorian calendars. Its length is 31 days. The eighth month in the old
calendar of Romulus
c. 750 BC, October retained its name (from
Latin and
Greekôctō meaning "eight") after January and February were inserted into the calendar that had originally been created by the Romans. In
Ancient Rome, one of three
Mundus patet would take place on October 5,
Meditrinalia October 11,
Augustalia on October 12,
October Horse on October 15, and
Armilustrium on October 19. These dates do not correspond to the modern Gregorian calendar. Among the
Anglo-Saxons, it was known as
Winterfylleth (Ƿinterfylleþ), because at this full moon, winter was supposed to begin.[1]
October is commonly associated with the season of
spring in parts of the
Southern Hemisphere, and
autumn in parts of the
Northern Hemisphere, where it is the seasonal equivalent to
April in the Southern Hemisphere and vice versa.
This list does not necessarily imply either official status or general observance.
Non-Gregorian: 2024 dates
(All Baha'i, Islamic, and Jewish observances begin at the sundown prior to the date listed, and end at sundown of the date in question unless otherwise noted.)
The last two to three weeks in October (and, occasionally, the first week of November) are normally the only time of the year during which all of the
"Big Four" major professional sports leagues in the U.S. and Canada schedule games; the
National Basketball Association begins its preseason and about two weeks later starts the regular season, the
National Hockey League is about one month into its regular season, the
National Football League is about halfway through its regular season, and
Major League Baseball is in its postseason with the
League Championship Series and
World Series. To date there have been 30 occasions in which all four leagues played games on the same day (an occurrence popularly termed a sports equinox), with the most recent of these having taken place on October 30, 2023.[18] Additionally, the
Canadian Football League is typically nearing the end of its regular season during this period, while
Major League Soccer is beginning the
MLS Cup Playoffs.