National Black Cow Day is observed worldwide every June 10, celebrating the popular ice cream float beverage known as a root beer float, sometimes referred to as a black cow. This unofficial holiday honors the drink, which consists of root beer and vanilla ice cream, and encourages people to enjoy a glass or two of this refreshing treat. The origin of the root beer float dates back to 1893 when Frank J. Wisner, owner of Cripple Creek Brewing in Colorado, is believed to have created it. The holiday invites participants to share pictures of their drinks on social media using the hashtag #NationalBlackCowDay. Additionally, there is another holiday, National Root Beer Float Day, celebrated on August 6, which also recognizes this beloved beverage.