Wiarton is a community in the town of South Bruce Peninsula, Bruce County, Ontario, Canada. It is located at the western end of Colpoys Bay, an inlet off Georgian Bay, on the Bruce Peninsula. Wiarton is notable for the Wiarton Willie Festival, in February each year, when national and international media cover Wiarton Willie and his Groundhog Day prediction. In the summer, Wiarton hosts the Bruce Peninsula Multisport Race.