October is the tenth month of the year in the Julian and Gregorian Calendars and the sixth of seven months to have a length of 31 days. The eighth month in the old Roman calendar, October retained its name (from the Latin ôctō 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, Mrinalia 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, because at this full moon (fylleth) winter was supposed to begin.
October is commonly associated with the season of autumn in the Northern hemisphere and with spring in the Southern hemisphere.
Other October observances
This list does not necessarily imply either official status or general observance.
Non-Gregorian observances: 2018 dates
(Please note that all Baha'i, Islamic, and Jewish observances begin at 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 the only time of the year during which each of the "Big Four" major North American professional sports leagues 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. There have been 17 occasions in which all four leagues have played games on the same day (an occurrence popularly termed a "sports equinox"), with the most recent of these having taken place on October 19, 2017. 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.
United States, Culinary
Movable observances, 2017 dates
First Full Week: October 1–7
First Sunday: October 1
First Monday: October 2
First Tuesday: October 3
First Wednesday: October 4
First Thursday: October 5
First Friday: October 6
Week of October 9: October 8–14
Week of October 10: October 8–14
Second Sunday: October 8
Second Monday: October 9
Wednesday of second full week in October: October 11
Second Wednesday: October 11
Second Thursday: October 12
Second Friday: October 13
Friday falling on 13th: October 13
Second Saturday: October 14
Third Sunday: October 15
Third Monday: October 16
Third Thursday: October 19
Third Saturday: October 21
Week of Fourth Wednesday: October 22–28
Second to last Sunday: October 22
Fourth Monday: October 23
Fourth Wednesday: October 25
Last Friday: October 27
Fourth Saturday: October 28
Saturday closest to October 26: October 28
Last Sunday: October 29
Last Monday: October 30
October Star Stones:
- Libra (Sept. 22 to Oct. 22)
Planetary Stone: Sapphire; Lucky Charms: Opal, Sardonyx, Chrysolite; birthstone: pink Tourmaline, Opal
Planetary Stone: Garnet, Ruby; Lucky Charms: Aquamarine, Beryl
- October Lokesh birthstone is roser.
- October Mystical birthstone is Jasper.
- October Ayurvedic Birthstone is Opal.
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