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.[19] 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.
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^"World Vegetarian Day, October 1. North American Vegetarian Society (the North American WVD sponsor explains that "World Vegetarian Day [on] October 1st is the annual kick-off of Vegetarian Awareness Month", accessed November 14, 2018".
^"Palmer S. World Vegetarian Awareness Month. Vegan Outreach website, October 2, 2017, Accessed November 14, 2018". 3 October 2017.
^"October is National Vegetarian Awareness Month. Fix.com. October 1, 2014, Accessed November 14, 2018". October 2014.
^"Celebrate Vegetarian Awareness Month. Fruits & Veggies: More Matters. Monday, October 14, 2013, at 4:00 am. Accessed November 14, 2018".
^"Gerber J. 9 Easy Wasys to Celebrate Vegetarian Awareness Month. Care2. October 1, 2012. Accessed November 14, 2018". Archived from the original on November 15, 2018. Retrieved November 15, 2018.
^Nivison, Austin (October 30, 2023). "Sports Equinox 2023: NFL, NBA, NHL and MLB games taking place on same day for 30th time in history". CBS Sports.
^"American Archives Month". National Archives. 2017-06-22. Retrieved 2018-09-25.
^"October is Adopt a Shelter Dog Month". ASPCA. Retrieved 2014-10-17.
^"About NCSAM". www.staysafeonline.info. Archived from the original on October 5, 2009. Retrieved October 7, 2009.
^"American Pharmacists Month 2011". Pharmacist.com. Archived from the original on October 11, 2007. Retrieved 2011-11-01.