Why April Fool’s Day, Anyway?

April Fools’ Day is one of those holidays with a mysterious past—no one knows exactly how it started, but there are a few fun theories.

So where did it come from?

One popular story points to 16th-century France. When the Gregorian calendar was introduced in 1582, New Year’s celebrations shifted from around April 1 to January 1. According to the tale, people who didn’t get the memo (or refused to change) kept celebrating in early April—and became the butt of jokes, earning the nickname “April fools.”

That said, historians aren’t completely convinced this is the full story.

Other possible origins:

• Ancient Rome: The festival of Hilaria involved disguises, games, and playful mocking—very on-brand for April Fools’.
• Springtime chaos: Early April weather can be unpredictable, which may have inspired the idea of nature “fooling” people.
• Medieval literature: Geoffrey Chaucer made a reference in The Canterbury Tales that some interpret as an early nod to fooling traditions.

What it looks like today

April 1 is now all about harmless pranks, surprise jokes, and the classic reveal: “April Fool!”

Different countries add their own twist:

• In France, the tricked person is called a poisson d’avril (“April fish”), and kids might sneak a paper fish onto someone’s back.
• In Scotland, celebrations traditionally stretched into two days of pranks, including sending people on silly errands.

In the end, whether it started with calendars, festivals, or just a love of mischief, April Fools’ Day has become a worldwide excuse to laugh—and you might want to double-check anything suspicious on April 1.