Since I don't grow in your region, I have no personal knowledge of what grows well there. I simply have to go by what people tell me about growing garlic in their areas and what the commercial growers tell me. Some Creole varieties, and certainly some softneck varieties may be more cold-resistant. I just don't know. Often garlic is grown in soggy soil and in the far north (such as Michigan) I think this would be a problem. Sometimes growers simply live in a micro-climate and their zone doesn't quite fit their climate. And often, growers have tricks that make growing possible (mulching/hoop house/etc.). I love to experiment and encourage others to do so. I just won't tell someone in a zone 4/5 that they can successfully grow a certain garlic, particularly a Creole.
You want to harvest your garlic when approximately 1/2 of the lower leaves turn brown. Generally speaking, at least for me, I will harvest my hardneck 10-14 days before my softneck and Creole. Do let us know how your "experiment" turns out. I can add that information to my "data-bank" aka brain.
