Minnesota and North Dakota should be much higher, due to freezing temperatures. If the outbreak happened in the winter six months, the zombies would be popcicles. Easily survivable.
Dig a moat around property with this....
the ones that are able to shamble and stumble through the moat....Run over them with this:
Finish Burying them with this:
all those zombie hordes from the city and their decomposing flesh in the fields will certainly provide next year a bumper crop if properly used!
Wyoming and Eastern Montana, too. Hunt zombies in the winter with a snowmobile and a baseball bat (zombie polo!).
Like Alaska, a snowmobile and a rifle, or anything to bash/remove zombie heads with, and in just a few months, the frozen zombie horde would be severely depleted.
While Minnesotans are just about liberal enough to declare them an endangered species after that, in North Dakota, they'd be hunted to extinction...