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Unless the ground is heated, leaving a banana corm in the ground in central Wisconsin is certain death, unless it's a Basjoo or other very cold hardy specimen. Even then you'll need to keep the frost out of the soil. I have seen the ground frozen to over a foot deep in Illinois which is several hundred miles south of Timmko.
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I don't know about Wisconson, but around here, I have been able to just put a leaf bag over my gunneras which is enough to prevent the above ground bulb from freezing so I really doubt it freezes that deep around here especially with regular residual snow fall in zone 6.