Halloween originated with the ancient Celtic festival of Samhain and is now a worldwide event. Learn about the jack-o-lantern, trick-or-treating, Halloween costumes and more. We're taking a look at the history of Halloween, its origins, as well as the meaning behind classic Halloween symbols and fun Halloween facts. Halloween 2025 in the United States is on Friday, October 31, celebrating the Eve of All Hallows day or better known as All Saints’ Day. Halloween may have originated from the ancient Celtic festival of Samhain, marking the new year on November 1, when spirits were believed to roam the earth. The holiday was later merged with Roman and Christian traditions such as All Saints’ Day. Prepare for the scariest Halloween event in Southern California with high-energy live shows and terrifying scare zones awaiting you around every dark corner. From pagan rituals to costumes and candy corn, discover how Halloween—and its associated traditions—has evolved through the ages. Shop Spirit Halloween for an incredible selection of Halloween Costumes, Halloween Decorations, Halloween Accessories, and Halloween Makeup. Fast shipping & huge selection! Visit Halloween Horror Nights, the premier Halloween event, at Universal Studios in Los Angeles, Orlando, Singapore and Japan. Halloween, [a] also known as All Hallows' Eve, [9] or All Saints' Eve, [10] is a celebration observed in many countries on 31 October, the eve of the Western Christian feast of All Hallows' Day. Halloween, a holiday observed annually on October 31 and noted for its pagan origins and its Christian roots as well as its secular traditions. In much of Europe and most of North America, observance of Halloween is today largely nonreligious, celebrated with parties, spooky costumes, pumpkin carvings called jack-o’-lanterns, and trick or treat.