Some northern beekeepers have success overwintering nuclei-sized colonies. This may be based on a particular stock or genetic trait, and should be tested carefully. More beekeepers are able to overwinter a single, deep hive body by packing the hive out with honey or sugar syrup in the Fall. In addition to food reserves, make sure such colonies are protected from the harsh winds of Winter.
Read the complete article here: Overwintering Nuclei Colonies — BEEKeeping: Your First Three Years