[IYAS9YAS]

In the book World War Z, the zombies froze in the winter but thawed and re-animated in the spring.

And they were able to survive under water and attack from below.

[GraceG]

[ In the book World War Z, the zombies froze in the winter but thawed and re-animated in the spring. ]

Move to nebraska, during the winter use sledge hammer to shatter zombies, problem solved