Tenth month in the Julian and Gregorian calendars
"Oct." redirects here. For other uses, see
Oct .
Red maple (Acer rubrum In recent decades, the number of warm temperature records in October has outpaced cold temperature records over a growing portion of Earth's surface.[ 1] October is the 10th month of the year in theJulian andGregorian calendars . Its length is 31 days. The eighth month in the oldcalendar of Romulus c. 750 BC , October retained its name (from Latin andGreek ôctō meaning "eight") after January and February were inserted into the calendar that had originally been created by the Romans. InAncient Rome , one of threeMundus patet would take place on October 5,Meditrinalia October 11,Augustalia on October 12,October Horse on October 15, andArmilustrium on October 19. These dates do not correspond to the modern Gregorian calendar. Among theAnglo-Saxons , it was known asWinterfylleth (Ƿinterfylleþ), because at this full moon, winter was supposed to begin.[ 2]
October is commonly associated with the season ofautumn in parts of theNorthern Hemisphere , andspring in parts of theSouthern Hemisphere , where it is the seasonal equivalent toApril in the Northern Hemisphere and vice versa.
Thecalendula Anopal armband. Opal is the birthstone for October. Cuttourmaline October'sbirthstones are thetourmaline andopal .[ 3] calendula .[ 4] zodiac signs areLibra (until October 22) andScorpio (from October 23 onward).[ 5] [ 6]
This list does not necessarily imply either official status or general observance.
Our Lady of the Most Holy Rosary, whose devotion and Feast are celebrated in October Non-Gregorian: 2025 dates [ edit ] (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; theNational Basketball Association begins its preseason and about two weeks later starts the regular season, theNational Hockey League is in the first month of its regular season, theNational Football League is about halfway through its regular season, andMajor League Baseball is in its postseason with theLeague Championship Series andWorld Series . Days on which all four leagues play are colloquially known as asports equinox .[ 19]
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