Born On Box

May 21 Birthday

Zodiac sign, birthstone, birth flower and more for everyone born on May 21.

The zodiac sign for May 21 is

Gemini

Gemini runs May 21 – June 20. May 21 is day 1 of 31 in Gemini season, in the 1st decan.

May 21 is on the Cusp of Energy (Taurus–Gemini). The Sun changes sign at a slightly different time each year, so some people born on May 21 are actually Taurus. A birth chart with your birth year, time and place gives the exact answer.

Zodiac sign

Gemini

Twins · Air · Mutable

Birthstone

Emerald

Birth flower

Lily of the valley

Also hawthorn

Ruling planet

Mercury

Decan ruler: Mercury

How common

#132 of 366

11,298 US births a year

Day of the year

Day 141

Day 142 in a leap year

May 21 zodiac sign: Gemini

Gemini is ruled by Mercury, the planet of communication. The Twins are linked with curiosity and conversation, and with having two sides: interested in everything, and quick to move on.

Symbol♊ Twins
DatesMay 21 – June 20
ElementAir
ModalityMutable
Ruling planetMercury
Traitscurious, witty, adaptable, talkative
StrengthsQuick-thinking, sociable, versatile and good with words.
WeaknessesRestless, inconsistent and easily bored.
Opposite signSagittarius
Most compatible withAries, Leo, Libra, Sagittarius, Aquarius

The 1st decan of Gemini

Each sign is split into three decans of about ten days. May 21 falls in the 1st decan, which is ruled by Gemini’s own planet, Mercury, so the classic Gemini traits are said to be strongest.

May 21 birthstone: Emerald

Everyone born in May shares the same birthstone.

StoneColorHardness (Mohs)Said to symbolize
EmeraldGreen7.5–8Rebirth, love and wisdom

May 21 birth flower: Lily of the valley and Hawthorn

More about May birthdays

How common is a May 21 birthday?

May 21 is the 132nd most common birthday in the US out of 366. An average of 11,298 babies were born on it each year from 1994 to 2014, 1% more than on an average day.

Based on US birth records, 1994–2014. See every date ranked.

What day of the week was May 21?

Here’s the day of the week May 21 fell on each year, and the Chinese zodiac animal for someone born that day.

Birth dateDay of the weekChinese zodiac
May 21, 2030TuesdayMetal Dog
May 21, 2029MondayEarth Rooster
May 21, 2028SundayEarth Monkey
May 21, 2027FridayFire Goat
May 21, 2026ThursdayFire Horse
May 21, 2025WednesdayWood Snake
May 21, 2024TuesdayWood Dragon
May 21, 2023SundayWater Rabbit
May 21, 2022SaturdayWater Tiger
May 21, 2021FridayMetal Ox
May 21, 2020ThursdayMetal Rat
May 21, 2019TuesdayEarth Pig
May 21, 2018MondayEarth Dog
May 21, 2017SundayFire Rooster
May 21, 2016SaturdayFire Monkey
May 21, 2015ThursdayWood Goat
May 21, 2014WednesdayWood Horse
May 21, 2013TuesdayWater Snake
May 21, 2012MondayWater Dragon
May 21, 2011SaturdayMetal Rabbit
May 21, 2010FridayMetal Tiger
May 21, 2009ThursdayEarth Ox
May 21, 2008WednesdayEarth Rat
May 21, 2007MondayFire Pig
May 21, 2006SundayFire Dog
May 21, 2005SaturdayWood Rooster
May 21, 2004FridayWood Monkey
May 21, 2003WednesdayWater Goat
May 21, 2002TuesdayWater Horse
May 21, 2001MondayMetal Snake
May 21, 2000SundayMetal Dragon
May 21, 1999FridayEarth Rabbit
May 21, 1998ThursdayEarth Tiger
May 21, 1997WednesdayFire Ox
May 21, 1996TuesdayFire Rat
May 21, 1995SundayWood Pig
May 21, 1994SaturdayWood Dog
May 21, 1993FridayWater Rooster
May 21, 1992ThursdayWater Monkey
May 21, 1991TuesdayMetal Goat
May 21, 1990MondayMetal Horse
May 21, 1989SundayEarth Snake
May 21, 1988SaturdayEarth Dragon
May 21, 1987ThursdayFire Rabbit
May 21, 1986WednesdayFire Tiger
May 21, 1985TuesdayWood Ox
May 21, 1984MondayWood Rat
May 21, 1983SaturdayWater Pig
May 21, 1982FridayWater Dog
May 21, 1981ThursdayMetal Rooster
May 21, 1980WednesdayMetal Monkey
May 21, 1979MondayEarth Goat
May 21, 1978SundayEarth Horse
May 21, 1977SaturdayFire Snake
May 21, 1976FridayFire Dragon
May 21, 1975WednesdayWood Rabbit
May 21, 1974TuesdayWood Tiger
May 21, 1973MondayWater Ox
May 21, 1972SundayWater Rat
May 21, 1971FridayMetal Pig
May 21, 1970ThursdayMetal Dog
May 21, 1969WednesdayEarth Rooster
May 21, 1968TuesdayEarth Monkey
May 21, 1967SundayFire Goat
May 21, 1966SaturdayFire Horse
May 21, 1965FridayWood Snake
May 21, 1964ThursdayWood Dragon
May 21, 1963TuesdayWater Rabbit
May 21, 1962MondayWater Tiger
May 21, 1961SundayMetal Ox
May 21, 1960SaturdayMetal Rat
May 21, 1959ThursdayEarth Pig
May 21, 1958WednesdayEarth Dog
May 21, 1957TuesdayFire Rooster
May 21, 1956MondayFire Monkey
May 21, 1955SaturdayWood Goat
May 21, 1954FridayWood Horse
May 21, 1953ThursdayWater Snake
May 21, 1952WednesdayWater Dragon
May 21, 1951MondayMetal Rabbit
May 21, 1950SundayMetal Tiger
May 21, 1949SaturdayEarth Ox
May 21, 1948FridayEarth Rat
May 21, 1947WednesdayFire Pig
May 21, 1946TuesdayFire Dog
May 21, 1945MondayWood Rooster
May 21, 1944SundayWood Monkey
May 21, 1943FridayWater Goat
May 21, 1942ThursdayWater Horse
May 21, 1941WednesdayMetal Snake
May 21, 1940TuesdayMetal Dragon

More about May 21

Season (Northern Hemisphere)Spring
Day of the year141 (142 in a leap year)
Days left in the year224 (224 in a leap year)

Want your exact age or a countdown? Try the age calculator on our sister site Day Count Box.

May 21 birthday questions

What zodiac sign is May 21?
People born on May 21 are Gemini (♊), the Twins. Gemini season runs from May 21 – June 20.
What is the birthstone for May 21?
The birthstone for May 21 is the May birthstone: emerald.
What is the birth flower for May 21?
May’s birth flowers are the lily of the valley and hawthorn.
Is May 21 on a cusp?
Yes. May 21 falls in the Cusp of Energy, between Taurus and Gemini. Because the Sun changes sign at a slightly different time each year, people born on May 21 in some years are Taurus. Check a birth chart with your exact birth year, time and place to be sure.
How rare is a May 21 birthday?
May 21 is the 132nd most common birthday in the US out of 366. An average of 11,298 babies were born on it each year from 1994 to 2014, 1% more than on an average day.
What day of the year is May 21?
May 21 is day 141 of the year, or day 142 in a leap year.

Other May birthdays