10 Halloween Facts You Probably Didn’t Know (Updated for 2026)

Halloween is celebrated on October 31 each year in many countries, especially the United States, Canada, and the United Kingdom. The holiday blends ancient seasonal traditions with later religious observances—and over time it evolved into the costume-and-candy celebration we know today.

Below are 10 Halloween facts that are well documented and widely cited across credible historical references.

Halloween Facts and Stats for 2026

1. Halloween traces back to Samhain. Many historians connect Halloween’s roots to the ancient Celtic festival of Samhain, marking the end of harvest and the start of winter. Source
2. The name “Halloween” comes from “All Hallows’ Eve.” The word is tied to the eve before All Saints’ Day (All Hallows’ Day), which is November 1. Source
3. Costumes have deep historical roots. Dressing up is often linked to older traditions of disguises and masquerading associated with seasonal festivals and later Halloween customs. Source
4. Trick-or-treating has medieval precursors. A commonly cited predecessor is “souling,” when people went door-to-door requesting food in exchange for prayers for the dead. Source
5. “Guising” helped shape modern trick-or-treating. Another frequently cited tradition is “guising,” where children dressed up and performed in exchange for treats—often referenced in discussions of how trick-or-treating developed. Source
6. Jack-o’-lanterns didn’t start as pumpkins. Early versions are often associated with carved turnips (and other root vegetables) before pumpkins became the popular choice in North America. Source
7. Halloween spread and evolved rapidly in North America. Many mainstream histories describe how immigration and changing social traditions helped transform Halloween into a widely celebrated community event in the U.S. and Canada. Source
8. Michael Myers’ mask was modified from a Captain Kirk mask. The iconic Halloween mask is widely reported to have been created by altering a William Shatner (Captain Kirk) mask. Source
9. Hollywood (Los Angeles) has treated Silly String as a public nuisance on Halloween. The City of Los Angeles has addressed Silly String in an ordinance context related to Halloween/public nuisance enforcement (including penalties). Source
10. There are Guinness records tied to jack-o’-lanterns. Guinness World Records tracks multiple pumpkin/jack-o’-lantern records, including “heaviest jack-o’-lantern.” Source

Bonus: Want to go down a fun rabbit hole? The evolution of trick-or-treating is full of regional traditions (souling, guising, mischief nights, and more). Read more.