National Pumpkin Spice Day is observed worldwide every October 1, celebrating the popular flavor associated with autumn. The day is marked by enjoying pumpkin spice products, particularly the Pumpkin Spice Latte, which was popularized by Starbucks in 2003. People often celebrate by ordering pumpkin spice beverages, baking with pumpkin spice, and sharing these treats with friends and family. The spice blend itself, consisting of cinnamon, cloves, ginger, nutmeg, and sometimes allspice, was originally created for pumpkin pie, with its earliest recipe dating back to 1796 in the American cookbook "American Cookery" by Amelia Simmons. While the day’s origin is unclear, it has become a beloved unofficial holiday for many.