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March zodiac sign: Pisces or Aries?

Emily HartBy Emily Hart, professional astrologer
The Pisces and Aries constellations side by side in golden line art on a violet night sky — the month's two zodiac signs
The short answer
PiscesBorn March 1–20PiscesAriesBorn March 21–31Aries

March is split between two zodiac signs: the Sun finishes its run through Pisces and enters Aries around March 21. So your March zodiac sign depends on the day — and, if you're born right at the boundary, on the year and hour too.

Born around the boundary?
The Sun doesn't change signs at midnight sharp: the exact moment shifts by up to a day depending on the year and your time zone. If your birthday is March 20–21, don't guess — check your exact sign by date of birth.

What March people have in common

March holds the end and the beginning of the zodiac circle: Pisces closes the cycle in contemplation, Aries opens the next with action. March people carry that contrast inside — softness and drive, dreaminess and decisiveness; the only question is the proportion, set by the birthday.

Within each sign the flavor shifts by decan — ten-degree thirds of the sign. Born the 1st–9th, you're in the second decan of Pisces: its core with a shade of Cancer. The 10th–20th is the third decan, tinted by Scorpio. From the 21th you're in the first, purest decan of Aries. That's why people of the same month, born ten days apart, can feel so different.

March's birthstone is the aquamarine: the sea's stone, a traditional talisman of courage, clear speech and long journeys.

The Pisces in short

PiscesPiscesFebruary 19 – March 20
Pisces feel the room before they enter it: boundless empathy, oceanic imagination, kindness as a default setting. Their task is boundaries; their gift is noticing what everyone else misses. In love they merge deeply and idealize generously; Cancer, Scorpio and Taurus give the safety this tenderness needs. Ruled by Neptune (classically Jupiter), water element: protect their dream and they'll make your life the poem.
The full Pisces portrait

The Aries in short

AriesAriesMarch 21 – April 19
Aries open the zodiac and behave accordingly: first to start, first to speak, first back up after a fall. Direct to a fault and brave by reflex — patience is the lifelong homework. In love they pursue openly and burn brightly; Leo, Sagittarius and Gemini enjoy the heat without scorching. Ruled by Mars, fire element: match their honesty, never their volume, and the flame holds for years.
The full Aries portrait

Frequently asked questions

What zodiac sign is March?+
March covers two signs: Pisces from the 1st through the 20th, and Aries from the 21th through the 31th. The boundary day can shift by one day depending on the year — a birth chart settles it exactly.
What sign is March 21?+
On the average year, March 21 is the first full day of Aries — but in some years the Sun crosses the line a few hours earlier or later. If that's your birthday, the free calculator on our dates page resolves it from your exact date.
Why does March have two zodiac signs?+
Zodiac signs follow the Sun's position, not the calendar: the Sun spends about 30 days in each sign, entering a new one around the 20th–23rd of every month. That's why every calendar month is shared by two signs.
Who are March-born people compatible with?+
It depends which of the month's two signs is yours. Pisces is a Water sign: it pairs most easily with its own element and its complement. Aries runs on Fire — a different circle entirely. The two sign cards above link to the full compatibility breakdown of each with all 12 signs; for a specific couple, a synastry of both full charts settles it.

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