When you take a plant to the northern end of its zone there is a risk each winter in losing it. You can wrap a palm over winter to protect it some from the cold but this is quite a task and is rather unsightly. If they were mine I think I would just take the risk and see how the winter turns out and if one is lost then not replace them with a marginally hardy palm but rather choose a hardier type of palm. Those palms are quite an investment and it is a shame to lose one, but you can't control the weather and protecting them is a challenge to say the least.
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