National Hot Mulled Cider Day is an unofficial holiday celebrated in the United States every September 30. This day is dedicated to enjoying warm apple cider infused with spices and sometimes fruit, making it a popular beverage during the fall and winter months. The origins of hot mulled cider trace back to an old pagan tradition called wassailing, which involved singing and drinking to ensure a good apple harvest. Traditionally, the drink is made by heating apple cider with spices like cinnamon, ginger, and nutmeg, and can be served non-alcoholic or spiked with liquor. People celebrate this holiday by making and sharing hot mulled cider with friends, embracing the cozy atmosphere of the season.