Samhain and the Origins of Halloween: from Celtic Festival to Modern Holiday
2026-07-22
Contemporary Halloween — with costumes, carved pumpkins, and the "trick-or-treat" tradition — traces back to a much older Celtic seasonal festival, whose historical path is now well documented by folklorists and historians of religion.
Samhain: the Celtic marker of the harvest's end
Samhain was a Celtic seasonal festival marking the end of the harvest season and the start of winter, celebrated around October 31st to November 1st on the current calendar. Among the Celtic peoples of ancient Ireland, this period was understood as a moment of significant transition, in which the boundary between the world of the living and the spirit world was considered thinner — a belief well documented in later medieval Irish sources, as historian Ronald Hutton discusses in his reference work "Stations of the Sun" (1996).
Christianization: All Saints' Day
From the 9th century onward, the Catholic Church consolidated November 1st as All Saints' Day (All Hallows' Day), with the preceding night — October 31st — known as All Hallows' Eve, the term from which the name "Halloween" directly derives. Historians such as Ronald Hutton debate the extent to which this date was deliberately chosen to replace or absorb Samhain, or whether the calendar proximity is a coincidence reinterpreted later — a genuine point of academic discussion, without definitive consensus.
The Irish diaspora and consolidation in the United States
Many of the specific traditions of modern Halloween — including carving pumpkins (originally turnips, in Ireland, before the pumpkin, an American plant, became the predominant material) and the practice of going door-to-door asking for candy — were consolidated and popularized in the United States throughout the 19th and early 20th centuries, largely brought and adapted by Irish and Scottish immigrants who carried seasonal customs of Celtic and Christian origin with them.
What remains of Samhain in today's Halloween
Although contemporary Halloween has become, especially in the United States, a mostly secular and commercial holiday, the theme of a thin boundary between the living and the dead — present both in ancient Celtic Samhain and in elements of later folklore — remains a recognizable symbolic thread, even though it is now expressed mainly through costumes, decorations, and horror narratives, rather than through the formal religious rituals practiced in Celtic antiquity.