I can't help much with specific plants because I'm further south, but I can say from experience that the USDA zone should only be a guide. Depending on your specific microclimate you may be a full zone or even 1 1/2 from the official zone for your area. Consider if you are exposed to winds, are low-lying (cold settles), sheltered by a warm building (or heavy agricultural backing), etc.. It may enable you to expand what you can (or can't) grow. Unfortunately - we usually ahve to experiment to find out.
Also - I was convinced that the USDA zones were getting obsolete due to generalized warming. Things grew succesfully that were borderline for my zone. The extended winter last year took out several naturalized orchids that had survived for years.
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