It depends on what the temperature drops to, the freezing poing of the syrup you are feeding, and where the feed is located re the cluster. If you are feeding 2:1 sugar syrup, it won't freeze until about 18 degrees F. If its in a jar feeder above the cluster, then the cluster warmth will keep it thawed.
It really doesn't matter if it does freeze and thaw unless in a glass jar. A hive top feeder is arguably an excellent investment.
Fusion