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How Halloween Grew From Celtic Samhain to a Global Pop Holiday

Church reframing plus immigrant traditions turned a Celtic year’s-end ritual into today’s pumpkin carving, costumes and trick-or-treating.

Overview

  • Halloween’s roots trace to Samhain, a Celtic festival marking the shift to winter when people believed the boundary with the dead thinned.
  • Pope Gregory III set All Saints’ Day on November 1 in the 8th century, recasting October 31 as All Hallows’ Eve, later shortened to Halloween.
  • Irish and Scottish migrants carried their customs to North America in the 19th century, where they evolved into parades, costumes and door-to-door treats.
  • The Jack O’Lantern tradition stems from the Stingy Jack legend and early lanterns carved from turnips, which became pumpkins in America due to availability.
  • Regional variants persist such as Galicia’s Samaín, and parallels with Mexico’s Día de Muertos reflect later Christian syncretism rather than a direct lineage.