Sagittarius season usually starts on November 22 and runs until about December 21 in Western astrology.

Core dates

  • Most modern Western horoscopes say Sagittarius starts on November 22 and ends on December 21.
  • In practice, the exact start can shift by a day (sometimes late on November 21 or early on November 23) depending on the year and your location, because it is tied to the moment the Sun enters Sagittarius, not just the calendar date.

If you are “on the cusp”

  • If your birthday is around November 21–23, you might be either late Scorpio or early Sagittarius depending on the year and the exact time and place of birth.
  • To know for sure, astrologers recommend generating a precise birth chart using your date, exact birth time, and birthplace, so you can see which sign the Sun was actually in at that moment.

Other astrology systems

  • Western “tropical” astrology (what most apps and magazines use) gives Sagittarius roughly November 22–December 21.
  • In Vedic (sidereal) astrology, Sagittarius typically starts much later, around December 15 and runs to about January 13, because it uses a different way of aligning signs with the sky.

TL;DR: When people ask “when do Sagittarius start,” they almost always mean Western Sagittarius season, which starts around November 22 each year, with small year‑to‑year shifts near that date.

Information gathered from public forums or data available on the internet and portrayed here.