With winter fast approaching there are at least two tasks you should consider completing soon. These will help get your hives through the fall and winter, as well as helping to set them up to be strong going into spring. I would not the only consider these tasks nice to do but I would see them as two of the most important.
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Task number one:
Install entrance reducers. Entrance reducers can serve to keep unwanted invaders out of the hive. As temperatures cool mice and other insects sometimes will seek out a warm corner of a hive. A nice place to get away from the cooler wetter weather. The smaller hive opening of the reducer can also aid the bees in defending the hive from another invader, yellow jackets. Yellow jackets can wreak havoc on a hive. In a search for food, yellow jackets can invade a hive, killing bees, including the queen, steal food stores, and ultimately lead to the demise of a hive. I have lost several hives due to yellow jacket attacks. Usually because I did not get my reducers installed soon enough.
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Task number two:
Check for adequate food stores. If a hive is gong to survive the winter, especially in the colder and wetter regions it will need enough food to make it. Assuring there is plenty of honey in the hive is most important. You can do this as part of a regular hive inspection by checking frames for capped honey. Another way to check, especially if the weather is cold or wet, is to try to lift the hive at the back. If the hive is extremely heavy then there is a good chance there is enough honey. However, if it is light and easy to lift then you might be in for trouble. Depending on how early it is in the fall, you can feed your bees a 2:1 sugar syrup. Another option is to feed excess honey you may have back to the bees. When using honey you can simply pour it on top of the inner cover. Sugar syrup will need some type of feeder like that in the photo below.
While neither of these two tasks are a guarantee to assure your bees will make it through the winter. They certainly are a good start to and effort to help overwinter your bees and go into spring with strong healthy colonies.