There is wide variance in hardiness of cultivars. You don't give enough info for us to respond with any certainty - your zone? USDA 5 or 6? Since zone 5 is usually the lower limit for in ground A. palmatums, and containerized plants need to subtract a zone or two from their predicted hardiness, to be safe your plants will need at least some protection. An unheated garage should do the job nicely, or you could unpot & plant against a building (preferably on the N or E side, out of sun and wind) for the winter, or bury pot and all if it's not too inconvenient.

Al