Halloween or Hallowe'en (less commonly known as Allhalloween, All Hallows' Eve, or All Saints' Eve) is a celebration observed in many countries on 31 October, the eve of the Western Christian feast of All Hallows' Day. Atlanta, GA » 59° Halloween's roots are about 2,000 years old and go back to a Celtic festival called Samhain. Halloween, a holiday observed on October 31, the evening before All Saints' Day. The celebration marks the day before the Western Christian feast of All Saints and initiates the season of Allhallowtide. In much of Europe and most of North America, observance of Halloween is largely nonreligious. Why Do We Celebrate Halloween on October 31? The ancient Gaelic festival of Samhain, which occurred on November 1 but kicked off the evening before, is considered the earliest known root of The Celts' new year began on November 1, so the day before—October 31st—was marked by a very important celebration called Samhain. An artist's impression of Halloween (Photo Credit : Alexander Raths/Shutterstock) Samhain was in honor of summer's end, and the inevitable approach of winter, the cold, dark and dangerous season where life Learn how Halloween evolved from the ancient Celtic festival of Samhain to the Christian celebration of All Saints' Day, and how it became a popular American tradition. Find out why Halloween is celebrated on October 31 and see some of the history and culture of this spooky holiday. Why is Halloween celebrated on October 31? Know history, significance and celebration Halloween may have evolved over time from its ancient Celtic roots, but its essence remains intact. Halloween Date 2021: According to the popular Celt belief, on the night of October 31st, the boundary between the living and spirit world becomes thinner. By Sangeeta Nair. Oct 31, 2021, 14:21 IST. Why is Halloween celebrated on October 31? There are two answers to this question: a pagan one and a Christian one. The ancient Gaelic festival of Samhain, which occurred on November 1 but kicked off the evening before, is considered the earliest known root of our secular Halloween traditions. Halloween falls on October 31 because the ancient Gaelic festival of Samhain, considered the earliest known root of Halloween, occurred on this day. It marked a pivotal time of year when seasons changed, but more importantly, observers also believed the boundary between this world and the next became especially thin at this time, enabling them Mx4sxX.