Groundhog Day is a holiday celebrated on February 2nd in the United States and Canada. According to tradition, if a groundhog emerges from its burrow on this day and sees its shadow, it will retreat into its burrow, indicating six more weeks of winter weather. If it doesn't see its shadow, it will remain outside, marking an early start to spring. The holiday has its roots in German folklore and has been celebrated in North America since the 1800s. It is often commemorated with parades, festivals, and other events.