Saint Urho's Day is an informal celebration of Finnish culture observed primarily in the United States, Canada, and some areas in Finland on March 16. The holiday was created in 1956 by Richard Mattson, a Finnish-American from Minnesota, in response to a coworker's question about a Finnish patron saint. Mattson invented a legend about Saint Urho, who is said to have driven frogs or grasshoppers out of Finland, saving the grape crops. Originally celebrated on May 24, the date was shifted to March 16 to allow for festivities leading into Saint Patrick's Day. Despite being a humorous holiday, it is recognized in communities with Finnish roots, reflecting a blend of cultural pride and creativity. The celebration is not officially recognized by the Evangelical Lutheran Church of Finland, which does not observe feasts of saints.