Every October, front porches fill up with carved pumpkins, kids dress as superheroes and monsters, and candy bowls empty by the handful. It feels like pure fun. But Halloween started more than 2,000 years ago as something far more serious: a night when people believed the line between the living and the dead grew thin.
Here's how an ancient Celtic festival traveled across centuries and oceans to become the Halloween we know today.
It Started With Samhain
Halloween's oldest roots go back to the Celts, who lived about 2,000 years ago in what is now Ireland, the United Kingdom, and northern France. They celebrated a festival called Samhain (pronounced "SOW-in") on the night of October 31.
Samhain marked the end of the harvest and the start of the long, dark winter. For a farming people, winter was a season tied to hunger, cold, and death. The Celts believed that on this one night, the spirits of the dead could cross back into the world of the living.
To mark the night, communities lit huge bonfires and offered crops and animals. People wore costumes, often animal heads and skins, possibly to disguise themselves from wandering spirits. Druid priests were also thought to see the future more clearly on Samhain, so it was a time for predictions about the year ahead.
Romans, Saints, and the Name "Halloween"
By 43 A.D., the Roman Empire had conquered most Celtic lands. Over the next few hundred years, Roman festivals blended with Samhain. One was Feralia, a late-October day honoring the dead. Another honored Pomona, the Roman goddess of fruit and trees. Her symbol was the apple, which may explain why bobbing for apples became a Halloween game.
As Christianity spread, the Church added its own holidays. In the 8th century, Pope Gregory III set November 1 as a day to honor all saints, called All Saints' Day or All Hallows' Day. Later, November 2 became All Souls' Day, honoring everyone who had died.
The night before All Hallows' Day became All Hallows' Eve. Over time, that phrase was shortened to "Hallowe'en," and finally "Halloween." Many of the old Samhain customs, like bonfires and costumes, simply carried over into the new holiday.
Souling, Guising, and the First Jack-o'-Lanterns
In medieval Britain and Ireland, the poor would go door to door on All Souls' Day asking for food. They received "soul cakes," small pastries, in exchange for promising to pray for the family's dead relatives. This was called souling, and it's one of the earliest versions of trick-or-treating.
In Scotland and Ireland, young people practiced guising. They dressed in costume and went house to house, offering a song, poem, joke, or other small performance in return for food, coins, or treats.
The jack-o'-lantern comes from an Irish folk tale about "Stingy Jack," a man who tricked the Devil. When Jack died, he was turned away from both heaven and hell. He was left to roam the earth with only a burning coal inside a carved-out turnip to light his way. People in Ireland and Scotland began carving scary faces into turnips and potatoes to frighten away Jack and other wandering spirits.
How Halloween Came to America
In colonial America, Halloween was rare. The strict Protestant beliefs in New England frowned on it. It was more common in Maryland and the southern colonies. There, people held "play parties" in the fall to celebrate the harvest, tell ghost stories, share fortunes, and dance.
Everything changed in the mid-1800s. Millions of Irish immigrants came to the United States, many fleeing the Great Potato Famine of 1846. They brought their Halloween traditions with them.
In America, they found something better than turnips for carving: the pumpkin. It was bigger, easier to hollow out, and grew everywhere. The pumpkin jack-o'-lantern quickly became the symbol of the holiday.
From Pranks to Trick-or-Treating
By the late 1800s, Americans were turning Halloween into a community holiday. Parties for kids and adults became popular, focused on games, seasonal food, and costumes rather than ghosts and witchcraft.
In the early 1900s, though, Halloween night also got a reputation for pranks. Some of that mischief turned into real vandalism in the 1920s and 1930s. Towns looked for a way to keep young people busy and out of trouble.
The answer was trick-or-treating. Drawing on the old traditions of souling and guising, neighbors handed out treats to costumed kids at the door. The custom spread widely after World War II, when sugar rationing ended and the baby boom filled suburbs with children.
Today, Halloween is one of the biggest holidays in the United States. Americans spend billions of dollars every year on candy, costumes, and decorations. It's now second only to Christmas as the country's top decorating holiday.
Halloween Around the World
Halloween isn't just an American thing. And many cultures have their own holidays for remembering the dead that feel like cousins to it.
Ireland and Scotland: The birthplace of Halloween still celebrates with bonfires, costumes, and barmbrack, a fruit bread baked with small charms inside that "predict" your future.
Mexico: Día de los Muertos (Day of the Dead) runs November 1–2. Families build colorful altars called ofrendas, decorated with marigolds, photos, sugar skulls, and the favorite foods of loved ones who have passed. It's a joyful celebration of memory, not a scary one.
The Philippines: During Undas, around November 1, families visit cemeteries, clean and decorate graves, and often spend the night there sharing food together.
United Kingdom: Halloween is growing, but many Brits put more energy into Guy Fawkes Night on November 5, with bonfires and fireworks.
China: The Hungry Ghost Festival, held in late summer, is when spirits are believed to roam the earth. People burn paper offerings and set out food to keep them at peace.
Japan: Obon, in summer, welcomes ancestors' spirits home with lanterns and dances. Meanwhile, American-style Halloween costume parties have exploded in popularity in cities like Tokyo.
As American movies, TV, and stores spread around the globe, costume parties and trick-or-treating have caught on in places from Germany to South Korea.
An Old Holiday That Keeps Changing
From Celtic bonfires to Irish turnip lanterns to American pumpkins and candy, Halloween has been reinvented again and again. What hasn't changed is the heart of it: a night to gather, dress up, face our fears with a laugh, and remember those who came before us.
So this October 31, when you carve a pumpkin or hand out candy, you're keeping a tradition alive that's more than 2,000 years old. Happy Halloween!
