Samhain
The religious year of Pagans starts and ends with Samhain, which is also the beginning of the Celtic new year," according to Patti Wigington, Pagan/Wiccan Guide. Samhaim is also a time for honoring ancestors who came before, Patti explains.
All Hallows' Eve
Catholics celebrate the first of November as The Solemnity of All Saints. October 31st is thereby designated as All Hallows' Eve (since the Saints celebrated on November 1st are considered hallowed.
Despite these religious beginnings of Halloween, old beliefs about black cats and witches still play a large part in this holiday.