Bird enthusiasts can leave hummingbird feeders up all winter to feed late-arriving birds or birds that choose to spend the winter in the area. It is a myth that feeding birds in winter delays their migration. Hummingbirds that spend the winter in cold areas need reliable sources of nectar.
Keeping feeders from freezing is major concern during winter in cold climates. Hummingbirds need to feed as early as possible in the morning after coming out of torpor, and a frozen feeder can take hours to thaw. Keep feeders sheltered from winds and cold weather, and insulate them by wrapping the feeder bottle in bubble wrap. If those options are not possible, bring feeders indoors at night, and replace them early each morning.