The Fish · February 19 – March 20
March 18 Zodiac Sign
Born on March 18, you're a Pisces — compassionate, imaginative and deeply intuitive — the zodiac's dreamer.
Zodiac sign
Element · Modality
Water · Mutable
Decan (third)
Mars-ruled
Birthstone
Aquamarine
Birth flower
Daffodil
Season position
Day 29 of 31
What astrology says about a March 18 birthday
March 18 is day 29 of Pisces season, so astrologers link it with the sign's core character: compassionate, imaginative, intuitive, artistic. Traits astrologers commonly associate with Pisces include adaptable and emotionally generous; deep compassion and empathy; rich imagination and creativity.
A commonly cited growth area for Pisces: difficulty setting boundaries. For the full picture of the sign, read the Pisces guide.
3rd decan of Pisces: Mars
Each sign is divided into three decans, 10° slices that the Sun crosses in about ten days each. March 18 falls in the third decan of Pisces (about March 10–20), which the traditional Chaldean system assigns to Mars. Astrologers say that adds drive, courage and a direct approach.
Mars makes this stretch of the sign more assertive and action-minded — these are people who move first and think about the details on the way.
The number 18 in numerology
The 18 combines ambition with compassion. A birthday on the 18th is linked to leadership that is motivated by a wish to help other people succeed.
Numerology is a separate tradition from astrology and is offered here for interest.
March birthstone and flower
The modern birthstone for March is Aquamarine and the commonly listed birth flower is the daffodil. March falls in the month of the March equinox — spring in the northern hemisphere and autumn in the southern.
Pisces love and compatibility
Pisces is the zodiac's great romantic. They love with their whole heart and dream of a soulmate connection built on tenderness, creativity and emotional understanding.
Astrology is a symbolic tradition, not a science, and interpretations vary between astrologers. This page is for reflection and entertainment, not prediction or advice.
Beyond your March 18 Sun sign
Your Pisces Sun is one planet. Your Moon, Rising sign and the exact Mars-ruled decan details live in your full natal chart. Get yours free on Skygram.
Get my free birth chartMarch 18 birthday FAQ
What zodiac sign is March 18?
March 18 falls in Pisces, which runs from February 19 to March 20 in the tropical zodiac. The Sun changes sign at a slightly different moment each year, so the boundary can fall a day or so either side of these dates. If you were born close to the edge, your birth year, time and place decide it.
Is March 18 a cusp birthday?
Not by the usual definition, which counts the first and last couple of days of a sign. March 18 is day 29 of Pisces season, so it is normally read as a clear Pisces birthday.
Which decan is March 18?
March 18 is in the third decan of Pisces (March 10–20). In the traditional Chaldean system this decan is ruled by Mars, which astrologers say adds its own flavour to Pisces. Some modern astrologers assign decan rulers by element instead, which gives different planets, and decans are strictly 10° slices of the zodiac, so the date range is approximate.
What are the birthstone and flower for March?
The modern birthstone for March is Aquamarine and the birth flower is the daffodil. These come from calendar tradition rather than astrology, and the lists vary by country and source.