Halloween is a holiday celebrated each year on October 31, and Halloween 2024 will occur on Thursday, October 31. The tradition originated with the ancient Celtic festival of Samhain, when people would light bonfires and wear costumes to ward off ghosts. In the eighth century, Pope Gregory III designated November 1 as a time to honor all saints.

Halloween's origins date back more than 2,000 years. On what we consider November 1, Europe's Celtic peoples celebrated their New Year's Day, called Samhain (SAH-win). On Samhain eve—what we know as Halloween—spirits were thought to walk the Earth as they traveled to the afterlife. Fairies, demons, and other creatures were also said to be abroad.

Halloween’s origins can be traced back to antiquity. Most point to Samhain, a Celtic festival which commemorated the end of the harvest season and the blurring of the physical and spirit worlds, as Halloween’s forebear. Over the ages, the holiday evolved, taking on Christian influences, European myth and American consumerism.

Halloween’s origins can be traced back to the ancient Celtic festival known as Samhain, which was held on November 1 in contemporary calendars. It was believed that on that day, the souls of the dead returned to their homes, so people dressed in costumes and lit bonfires to ward off spirits.

Its pagan origins can be traced to the Celtic festival of Samhain, celebrated in ancient England and Ireland to mark the beginning of the Celtic new year. The souls of the dead were supposed to revisit their homes on Samhain eve, and witches, goblins, black cats, and ghosts were said to roam abroad.