I am in zone 5A : -20 to -15 degrees F. I thought about being more aggressive and growing Corot Noir, Vignoles, etc. but decided to go with hardier varieties. So far, I think that was the right choice. 2 of the past 5 years have seen winters that reached below -15.
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Thanks, I've added some of your vines listed to my research list. I do reds and the only green grape I have is a Neptune seedless for the table.