The short version
If your birthday falls between May 21 and June 20, you are a Gemini: quick, curious, witty, and restless, the zodiac's communicator who needs variety and conversation. Those are the Gemini dates in most years, but the exact start and end move by a day or so as the Sun shifts, so the edges are worth a closer look.
Why Gemini dates shift by a day each year
The Sun does not cross into Gemini at the same minute every year. It enters around May 21 and leaves around June 20, but the precise moment drifts by roughly a day depending on the year and your time zone. That is why two reputable sources can list slightly different Gemini dates, and why anyone born right at the edge needs their exact birth chart, not a generic date list, to be sure.
Born on the Gemini cusp?
If you were born at the very start of Gemini, around May 21, you may be on the Taurus-Gemini cusp: see May 20, May 21. If you were born at the very end, around June 20, you may be on the Gemini-Cancer cusp: see June 20, June 21. On a cusp, only your full birth chart can settle which sign your Sun is actually in.
The three types of Gemini: decans
Not every Gemini is alike. The sign splits into three ten-day decans, each with its own flavor: Gemini decan 1 (May 21 to 31), Gemini decan 2 (June 1 to 10), Gemini decan 3 (June 11 to 20). Your decan sharpens the basic Gemini picture depending on which third of the sign you were born in.
Gemini at a glance
Gemini (♊) is a mutable air sign ruled by Mercury. Its opposite sign is Sagittarius, and it sits between Taurus and Cancer in the zodiac wheel. As a mutable air sign, Gemini is quick at its core.
Are you sure you are a Gemini?
Your Sun sign is the baseline, but it is only the Sun, one of about ten major chart factors. Your Moon, rising sign, and planets depend on your exact date, time, and city, and near a cusp they can even shift your sun sign itself. Calculate your free birth chart to confirm your real placements, then start your 7-day free trial for a personal reading on your WhatsApp each morning.
Frequently Asked Questions
What are the dates for Gemini?
Gemini dates run from about May 21 to June 20. The exact boundaries shift by a day or so each year as the Sun moves, so a birthday right at the edge is best confirmed with a full birth chart.
Is someone born on May 21 a Gemini?
Usually yes, May 21 is right at the start of Gemini, on the Taurus-Gemini cusp. In some years the Sun crosses a little earlier or later, so a birth on that exact date is best checked against a real chart rather than a generic date list.
What if I was born on the Gemini cusp?
If you were born near May 21 or June 20, you are on a Gemini cusp and could be either sign depending on the year and your birth time. Only your full birth chart, built from your exact date, time, and city, can tell you for certain which sign your Sun is in.
Why do Gemini dates change each year?
Because the calendar and the Sun's path do not line up perfectly. The Sun enters Gemini at a slightly different moment each year, so the start and end dates drift by about a day. The date ranges you see are the typical ones, accurate for most years.
Curious about the energy of this time of year? See Gemini season, what it means for every sign.