Why October 31st? Now you might be wondering, why October 31st specifically? Well, the Celts believed that Samhain started at sunset on October 31st and ended at sunset on November 1st. So, it made perfect sense to celebrate the spooky festivities on the eve of the Celtic festival. When did Halloween come to the USA?
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, 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. .