The Real Origins of April Fools’ Day Are Older and Stranger Than the Calendar Myth

Historians say the holiday likely emerged from a mix of calendar changes, older festivals of misrule, and long-standing traditions of playful deception.

Riverbender Staff

Apr 1, 2026 8:27 AM

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A lot of people assume April Fools’ Day began as a simple mistake on a calendar. The story goes: France changed the date of the new year, a few stubborn holdouts kept celebrating in April, and everyone else mocked them. It’s a great tale—clean, funny, and easy to remember. It’s also only part of the picture.

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The real origins of April Fools’ Day are messier, older, and more interesting. What we call “April Fools’” is less like a single invention and more like a tradition that grew from many places where people liked one thing: turning the world upside down for a moment.

The popular “calendar change” story—and what it gets right

The most common origin story centers on France in the late 1500s. In 1564, King Charles IX issued the Edict of Roussillon, which moved the start of the new year to January 1. Before that, different regions marked the new year at different times, and in parts of France it was celebrated around late March and early April.

According to the legend, when the switch happened, some people either didn’t hear the news or refused to change. They kept celebrating the new year in early April. Others supposedly made fun of them by sending fake invitations to parties or playing small tricks. The mocked people were called “April fools.”

This story has a few things going for it:

It matches a real historical event (a calendar reform).
It explains why the tradition is tied to early April.
It fits the spirit of the day: social teasing, not serious harm.

But historians have a problem with it: there isn’t strong evidence that this calendar switch directly created a national prank day. Also, France’s change in 1564 did not instantly standardize behavior everywhere. Life moved slowly. News traveled slowly. And people didn’t always agree on dates even after laws changed.

So the calendar tale may be a later explanation that helped people make sense of a tradition that was already forming.

Older roots: festivals where rules were meant to break

Long before anyone argued about January 1, many cultures had celebrations built around mischief, role reversal, and playful chaos. These weren’t “April Fools’ Day” by name, but they share the same core idea: for a short time, normal rules loosen.

Roman “Hilaria” and public joking

In ancient Rome, a festival called Hilaria was held in late March in honor of the goddess Cybele. Accounts describe a mood of public joy, costumes, and a kind of permitted silliness. People could mock and imitate others more freely than usual.

Medieval and Renaissance “misrule”

In parts of medieval Europe, there were days when social roles flipped. Servants could pretend to be masters. Choir boys could be “bishops” for a day. These events weren’t always polite, and authorities sometimes tried to limit them. But the point was clear: society occasionally made room for laughter and disorder, then snapped back to normal.

April Fools’ Day fits this pattern. It’s a controlled release valve. It says, “You can bend the rules—but only a little, and only for a moment.”

The “April fish” and the language of fooling

In France and some French-speaking places, April 1 is linked with the phrase “poisson d’avril”—“April fish.” One classic prank is to tape a paper fish to someone’s back without them noticing.

Why a fish?

There are a few theories, and none is certain. Some connect it to seasonal fishing restrictions in early spring, when fish were harder to catch and people might be “sent” to catch something that wasn’t available. Others tie it to symbolism: fish are easy to “hook,” like a person who falls for a trick.

What matters is that the phrase shows April 1 was already a recognized day for playful deception in France. It wasn’t just random pranking. It had a name, a repeating tradition, and a shared joke people understood.

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English has its own label: “April fool.” The word “fool” here doesn’t mean a truly foolish person. It means someone who was briefly tricked—someone who took the bait.

Britain, newspapers, and the rise of the public prank

By the 1700s, April Fools’ customs were well established in Britain. One common trick was to send someone on a “fool’s errand”—a message or task designed to waste their time. Think of sending a new worker to fetch “a bucket of steam” or “left-handed scissors.” It’s not meant to ruin their day. It’s meant to create a shared laugh once the trick is revealed.

As printing and mass media grew, so did the scale of pranks. Newspapers could spread a false story quickly, and the audience would learn to read with a bit more skepticism—at least on April 1.

One of the most famous media pranks happened in 1957, when the BBC aired a segment showing Swiss farmers harvesting spaghetti from trees. Some viewers believed it and called in asking how they could grow their own spaghetti tree. It’s funny now, but it also makes sense: at the time, spaghetti wasn’t a common household food in Britain, and television still carried a strong “it must be true” authority.

That prank shows something important about April Fools’ Day: it often targets what people trust. In earlier centuries, it might have been a messenger or a neighbor. In the modern world, it’s a headline, a brand, or a viral post.

Why April 1 “works” as a prank day

Even without a single clear founding moment, April Fools’ Day survives because it solves a social puzzle: how do you trick someone without breaking trust?

The answer is a shared agreement. April 1 is a day where people expect a certain amount of deception. That expectation changes the rules. A prank that would feel rude on another day can feel acceptable if it stays within limits.

This is also why many cultures have similar traditions. The details differ, but the social function is the same: playful testing of belief, followed by relief and laughter.

Common misunderstandings and the fine line between funny and harmful

A big misconception is that April Fools’ pranks are supposed to be elaborate or humiliating. Historically, many were small: a fake errand, a paper fish, a silly story. The goal was surprise, not damage.

Modern pranks can go further because of social media. A fake announcement can spread to thousands of people in minutes. That raises the stakes—and the risk.

A useful rule of thumb many people follow is:

If the prank creates confusion, it should resolve quickly.
If it targets a fear (health, safety, job loss), it’s probably not worth it.
If the person can’t laugh afterward, it wasn’t really a joke.

Those aren’t ancient rules, but they match the older spirit of “misrule”: temporary, controlled, and meant to end with everyone still included.

How to spot April Fools’ traditions in everyday life

You don’t need to know Roman festivals or French idioms to recognize the day’s patterns. You can see them in ordinary moments:

A company announces a product that sounds almost believable—then slightly ridiculous.
A friend texts a “big update” that feels oddly timed and short on details.
A headline looks real but comes from a brand’s social account, not a news outlet.
Someone sets up a harmless switch: the salt in the sugar bowl, a computer mouse taped underneath, a swapped phone wallpaper.

A practical takeaway is simple: on April 1, pause before you react. Ask two quick questions:

Who benefits if I believe this right now?
How easy is it to check?

That tiny delay is the modern version of not getting sent on a fool’s errand.

A day built from many kinds of laughter

April Fools’ Day didn’t arrive with a single official birth certificate. It likely grew from several streams at once: old celebrations of misrule, local customs, shifting calendars, and the human delight in catching someone off guard—then letting them in on the joke.

That mix helps explain why the day feels both familiar and flexible. The pranks change with technology, but the basic idea stays the same. For one day, belief is a little less automatic, and laughter is allowed to interrupt the normal flow of things—so long as it doesn’t leave anyone behind.

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