Today is Friday the 13th, and in 2026, there are three of them.
That makes this one of those rare years where February, March, and November all land on a Friday the 13th. The last time that happened was 2015. The next time after 2026 won’t be until 2037.
So what actually is Friday the 13th? Why do so many people treat it like a danger zone? And does any of it hold up to facts?
Here is the full story, where it came from, what religion and history say, what science found, and how it forms everyday American life.
What is Friday the 13th and What Does it Mean?
Friday the 13th is simply the day when the 13th of any month falls on a Friday. That is it. Nothing more in calendar terms.
But in American culture, that combination carries a heavy reputation. It is widely seen as a bad luck day, a day to be cautious, skip big decisions, or avoid traveling.
According to mathematicians, there is always at least one Friday the 13th per calendar year, and the day occurs on average once every 212.35 days.
The fear of Friday the 13th even has an official name: paraskevidekatriaphobia. The paraskevidekatriaphobia meaning comes from three Greek words, “Paraskevi” (Friday), “triskaideka” (thirteen), and “phobos” (fear). The term was coined by psychotherapist Donald Dossey, who claimed he could cure patients of it simply by teaching them to pronounce it correctly.
Why is Friday the 13th Considered Unlucky? A Look at the Origins
The honest answer is that no one knows exactly. The superstition is surprisingly modern. Despite what many believe, there is no ancient origin story.
What historians do know is that the fear of Friday and the fear of the number 13 were two separate beliefs, and at some point, they fused together.
Why is the Number 13 Considered Unlucky? Triskaidekaphobia Explained
Western cultures have historically associated the number 12 with completeness; there are 12 days of Christmas, 12 months and zodiac signs, 12 labors of Hercules, 12 gods of Olympus, and 12 tribes of Israel. Its successor, 13, has a long history as a sign of bad luck.
Professor Thomas Fernsler of the University of Delaware explains that 13 has a bad reputation because it comes after the “complete” number 12. Because it comes next, 13 is often seen as incomplete and, therefore, unlucky.
The fear of the number 13 alone is called triskaidekaphobia. Triskaidekaphobia, the fear of number 13, predates the Friday connection by centuries and shows up across dozens of cultures independently.
Why Did Fridays Have a Bad Reputation Even Before the 13th?
Fridays were considered problematic long before any date was attached. In The Canterbury Tales, Geoffrey Chaucer presented Friday as an unlucky day, warning readers not to begin a journey or start a project on that day of the week. In medieval times, public executions were normally scheduled on Fridays, and condemned prisoners had to ascend 13 steps to reach the gallows.
When Was Friday the 13th First Written About?
The first written reference to Friday the 13th as an unlucky day appeared in 19th-century France. An 1834 article in the French literary magazine Revue de Paris by Italian author Marquis de Salvo referenced a Sicilian count who killed his daughter on Friday the 13th, stating, “It is always Fridays and the number 13 that bring bad luck.”
That is roughly 200 years ago. A relatively short history for something that feels so deeply rooted.
What are the Religious and Historical Theories Behind Friday the 13th?
Does the Last Supper Explain Why 13 Guests at a Table Is Bad Luck?
Stuart Vyse, a former professor of psychology at Connecticut College, explains that the fear of Friday the 13th may be rooted in religious beliefs surrounding the 13th guest at the Last Supper, Judas, the apostle said to have betrayed Jesus, and the crucifixion of Jesus on a Friday, which was known as hangman’s day. The combination of those factors produced a “sort of double whammy of 13 falling on an already nervous day.”
The Last Supper 13 guests superstition is actually one of the most well-documented threads in the history of this belief. The seating arrangement is believed to have given rise to a longstanding Christian superstition that having 13 guests at a table was a bad omen, specifically, that it was courting death. This is also why the day carries an alternate clinical name, friggatriskaidekaphobia, where “Frigga” refers to the Norse goddess after whom Friday is named.
Some biblical scholars also believe that Eve tempted Adam on a Friday, and that Cain killed Abel on Friday the 13th. These claims are debated, but they fed the tradition.
Did the Knights Templar Arrest on Friday October 13 1307 Start the Superstition?
On Friday, October 13, 1307, officers of King Philip IV of France arrested hundreds of the Knights Templar, a powerful religious and military order formed in the 12th century for the defense of the Holy Land.
This is one of the most widely cited origin stories of the Friday the 13th superstition. The Knights Templar arrest of Friday 1307 remains a favorite piece of historical folklore tied to the date, even though historians note the connection was largely made in hindsight. People remembered the date as ominous after the fact. Some historians argue that the Friday 1307 Knights Templar story only became attached to the superstition several centuries after the arrest itself.
What Does Norse Mythology Say About the Number 13?
One source for the unlucky reputation of the number 13 is a Norse myth about twelve gods having a dinner party in Valhalla. The trickster god Loki, who was not invited, arrived as the thirteenth guest and arranged for Höðr, the god of darkness, to shoot Balder, the god of joy and gladness, with a mistletoe-tipped arrow. Balder died, triggering much suffering in the world, which caused the number 13 to be considered unlucky.
How Did the Friday the 13th Superstition Spread Across America?
The single biggest turning point for Friday the 13th in American culture was a book.
A popular novel came out in 1907 called Friday the Thirteenth. It shows that, at least in American tradition, that was established as a superstitious day, particularly associated with Wall Street trading. There was a belief that trading on Fridays was particularly hazardous, but on Friday the 13th, extra hazardous, and the novel talks about it.
The book tells the story of an unscrupulous broker who exploits superstition to create a Wall Street panic on a Friday the 13th. By 1980, the superstition was so ingrained in popular culture that it became the title of one of the most profitable movie franchises in history, the Friday the 13th movie of 1980, starring Jason Voorhees.
Is Friday the 13th Actually Dangerous? What Superstition and Psychology Research Found
Here is where things get interesting.
Researchers have actually looked at whether Friday the 13th produces more accidents, hospital visits, or bad outcomes. The results are mixed, and that mix tells its own story. Superstition and psychology research has been surprisingly active on this topic over the past three decades.
Some early studies suggested higher rates of traffic accidents or hospital admissions on the day. A British Medical Journal study from 1993 found data suggesting accident rates differed on Friday the 13th compared to other Fridays. However, a 2008 Dutch study found fewer traffic accidents on Friday the 13th than on other Fridays, with reports of fires and thefts also lower on that day.
So what is going on? Jane Risen, a behavioral scientist at the University of Chicago Booth School of Business, found that superstitions can influence even people who do not believe in them.
In one 2016 study, Risen found that people who identify as superstitious and non-superstitious both believe a bad outcome is more likely when they feel “jinxed.” “Even if I don’t actively believe, just the fact that Friday the 13th exists as a known cultural element means that I entertain it as a possibility,” she explains.
This body of superstition and psychology research consistently points to one conclusion, the belief itself changes behavior. Anxious people drive more cautiously, stay home, cancel plans. That may actually reduce accidents rather than increase them.
Science does not support Friday the 13th being a genuinely unlucky day. What it does support is that the idea of the day has real psychological effects on millions of people.
How Does Friday the 13th Affect Modern American Life, Business, and Travel?
The Economy Feels It
Friday the 13th affects the US economy noticeably. Businesses lose an estimated $800 to $900 million as some people avoid work, travel, or major purchases on that day.
Why Do Hotels and Buildings Skip the Number 13 in Architecture?
The fear of number 13 in architecture and hotels is one of the most visible signs of how deep this superstition runs. Walk into a large American hotel or office building and look at the elevator buttons. Many buildings simply skip the 13th floor entirely, going from 12 to 14. The same happens in some hospitals and airports where gate 13 disappears from the signage.
Airlines have been known to skip row 13 on aircraft. Some airlines outside the US have quietly removed it from seating charts entirely. Across American cities, the number 13 in architecture, whether in hotels, hospitals, or office towers, remains one of the most quietly avoided numbers in construction planning.
Do People Really Avoid Signing Contracts or Buying Homes on Friday the 13th?
In some parts of the country, people genuinely avoid closing on a property, signing contracts, or launching a business on Friday the 13th. It is not universal, but it is common enough to be measurable.
How Many Americans Are Genuinely Afraid of Friday the 13th?
According to the Stress Management Center and Phobia Institute in Asheville, North Carolina, an estimated 17 to 21 million people in the United States are affected by paraskevidekatriaphobia, the fear of Friday the 13th, making it the most feared day and date in history. Some people are so paralyzed by fear that they avoid their normal routines, skip flights, and refuse to get out of bed.
How Did the Friday the 13th Movie of 1980 and Jason Shape Pop Culture?
The horror movie Friday the 13th, released in 1980, introduced the world to a hockey mask-wearing killer named Jason Voorhees, and is perhaps the best-known example of the famous superstition in pop culture history. The Friday the 13th movie of 1980 with Jason turned what was a cultural quirk into a full-scale horror brand. It spawned multiple sequels, as well as comic books, novellas, video games, related merchandise, and countless Halloween costumes.
The franchise ran for over a decade, produced 12 films, and made the date synonymous with horror in the minds of anyone who grew up in America in the 1980s and 1990s. It also helped push friggatriskaidekaphobia, the clinical term for the fear of Friday the 13th, into mainstream awareness. Before the movies, most Americans had vaguely heard of the superstition. After Jason, they had a face to put on it.
Today, the pop culture angle has taken a surprising turn. A newer tradition has taken root: tattoo and piercing shops across the United States now offer special discounts on Friday the 13th. It shows how people can flip the cultural association of a date over time.
Retailers like Hy-Vee have also run Friday the 13th sales events, leaning into the day as a marketing opportunity rather than something to fear.
Interesting Facts About Friday the 13th That Most People Do Not Know
- There can be no more than three Friday the 13ths in a single calendar year. In 2026, a common year starting on Thursday, they fall in February, March, and November.
- The 13th day of the month is actually very slightly more likely to be a Friday than any other day of the week, according to mathematicians.
- Unlucky days in different cultures look very different from the American version. In Spain and Greece, Tuesday the 13th is the feared combination. In Italy, it is Friday the 17th. In Japan and China, April 4 carries dread because the word for four sounds like the word for death. Bad luck days around the world are remarkably consistent in one way though, they almost always involve a number, a day of the week, or a combination of both.
- In the late 19th century, a New Yorker named Captain William Fowler sought to remove the stigma around the number 13 by founding an exclusive society called the Thirteen Club. The group dined regularly on the 13th of the month in room 13, deliberately doing everything superstition warned against. Four US presidents were members, including Chester Arthur and Grover Cleveland.
- The longest gap between two Friday the 13ths is 14 months. The shortest is just one month, which happens when February and March both carry a Friday the 13th in the same common year, exactly as in 2026.
- When you look at bad luck days around the world as a category, researchers find they cluster around specific types of events, religious calendars, historical tragedies, or astronomical patterns. Friday the 13th is unusual because its origins are genuinely mixed and hard to pin down to one source.
Frequently Asked Questions About Friday the 13th
What is Friday the 13th and why is it considered unlucky?
Friday the 13th is the day when the 13th of any month falls on a Friday. It is considered unlucky in Western culture because both Friday and the number 13 were independently seen as bad omens for centuries, through Christian tradition, Norse mythology, and medieval folklore. When the two combined, the reputation stuck.
Why is Friday the 13th unlucky according to the Bible?
The connection goes back to the Last Supper, where 13 people were present the night before Jesus was crucified. Jesus was crucified on a Friday. The 13th guest is identified in Christian folklore as Judas, who betrayed him. The Last Supper 13 guests superstition became one of the most enduring threads in Christian folk belief, and the two elements, 13 at a table, death on a Friday, eventually merged into a single day of dread.
How many times does Friday the 13th happen in a year?
At least once every year. Some years it happens twice, and in rare years, like 2026, it happens three times. The maximum is three occurrences per calendar year.
Is tomorrow Friday the 13th?
In 2026, Friday the 13th falls in February, March, and November. If you are reading this close to any of those dates, check your calendar for the exact date.
Is Friday the 13th really unlucky? What does science say?
Research is divided. Some older studies suggested increased accident rates, but a 2008 Dutch study found fewer accidents and incidents on Friday the 13th compared to regular Fridays. Scientists believe the day’s real effect is psychological, anxiety changes behavior, for better or worse, depending on the person.
What is paraskevidekatriaphobia?
Paraskevidekatriaphobia is the clinical name for the fear of Friday the 13th. Understanding the paraskevidekatriaphobia meaning requires breaking it down: Paraskevi means Friday in Greek, triskaideka means thirteen, and phobos means fear. The alternate version, friggatriskaidekaphobia, swaps the Greek “Paraskevi” for the Old Norse “Frigga,” the goddess after whom Friday is named in Germanic languages. Both terms describe the same phobia.
What is triskaidekaphobia?
Triskaidekaphobia is the fear of the number 13 by itself, without any connection to Friday. It predates the Friday the 13th superstition by centuries. Triskaidekaphobia, the fear of number 13, is documented across Western, Asian, and Middle Eastern cultures independently, which suggests the unease around 13 runs far deeper than any single religious or historical event.
Does Friday the 13th affect the economy?
Yes. Estimates suggest US businesses lose around $800 to $900 million on Friday the 13th as people avoid travel, purchases, and work out of superstition.
What is the significance of Friday the 13th in 2026?
In 2026, Friday the 13th happens three times, February 13, March 13, and November 13. This is the maximum possible in one calendar year and only happens because 2026 starts on a Thursday.
Are there unlucky days in different cultures besides Friday the 13th?
Yes. Unlucky days in different cultures vary widely. Tuesday the 13th is feared in Spanish-speaking countries and Greece. Friday the 17th carries the bad luck stigma in Italy. In China and Japan, the number four is avoided because it sounds like the word for death. Looking at bad luck days around the world as a whole, nearly every major culture has a version of this, a specific date or number combination that people treat with caution or avoid entirely.
Key Takeaways
Friday the 13th is genuinely fascinating, not because it is unlucky, but because of what it reveals about how humans relate to fear, pattern recognition, and shared belief.
The superstition is maybe 200 years old at most in its current form. It has no single origin. It grew from two separate traditions, one about a number, one about a day, that slowly merged and then got amplified by a novel, a film franchise, and decades of cultural reinforcement.
Superstition and psychology research keeps returning to the same finding: the belief matters more than the day itself. People behave differently on Friday the 13th, some avoid driving, some cancel flights, some refuse to sign documents. That behavioral shift is real, measurable, and economically significant even if the underlying fear is not grounded in evidence.
The paraskevidekatriaphobia meaning, when you break it down to its roots, is just “fear of Friday the 13th” in clinical language. But what it represents in practice is something much bigger: a window into how a shared cultural idea, with no single verified origin, can shape the behavior of tens of millions of people across centuries.
Science does not support it being a dangerous day. But the belief affects millions of people, moves hundreds of millions of dollars, shapes architecture across American cities, and quietly influences decisions every time the date arrives.
That kind of power, coming from nothing but a number and a day of the week, might be the most interesting thing about it.
