It depends on how cold you expect to get. We have severe winters with regular dips to -20C and well below on occasion so I move all my pots into the barn or the greenhouse.. I wait till their foliage has died down, clear it away and then just trundle them all in when dormant. No watering.
I've never lost a hosta but last winter, which wasn't the worst by a long chalk, I lost all my agapanthus and an acer because, after an early warm spell, we had heavy frosts just after they'd started growing again and been watered and fed. This year several hostas were turfed out into the garden and the pots planted up with annuals and pelargonius which will die anyway and go to the great compost heap - thus reducing the need for pot stashing.