<Li> Columbus, Ohio: 32 inches (. 8 m) </Li> <Li> Minnesota (2007): <Ul> <Li> Northern counties: 5 feet (1.5 m) </Li> <Li> Southern counties: 3.5 feet (1.1 m) </Li> </Ul> </Li> <Ul> <Li> Northern counties: 5 feet (1.5 m) </Li> <Li> Southern counties: 3.5 feet (1.1 m) </Li> </Ul> <Li> Northern counties: 5 feet (1.5 m) </Li>

What is the frost line in northern ontario