Answer: Possibly. In my experience, callas (Zantedeschia) are only reliably hardy in the warmest parts of the USA and are normally lifted before frost in the fall and planted out well after the last spring frost. However, there are reportedly a few varieties said to be marginally hardy in northern areas if planted in exceptionally protected spots. Whether they would be hardy for you or not, I don't know. I guess you could always experiment and see.
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