It is critical to your bees survival that they go into the winter with adequate food supplies. Begin feeding as soon as you pull the supers off and continue until the bees are no longer drawing it down. As it gets colder, the bees will be less interested in feeding. They will stay balled up and not go up to the feeder. Other times they will fill up the space they have as they dehydrate the syrup down to the moisture content of honey. In Wisconsin it is best if you have in excess of 50 pounds of honey in the hive.