With colder weather setting in, you should have stopped feeding your bees any liquids by now.  If you still have feeders, you probably notice the bees do not take much when the night time temperature plunges and they cluster.

Did you check the weight of the colonies the last time you were at your hive(s)?  Even if the hive(s) are not light, it is still a good idea to furnish each colony with a candy board.    It may prevent your bees from "starving to death"  even though there may be many frames of honey just inches away from the cluster.

There are several recipies for the "candy" in candy boards.   Do an internet search to get more information on construction of the candy board, the recipe for the candy or where to buy them if you prefer not to or do not have the time to make them.

The candy board  (candy side down) will replace the inner cover on the hive.   You can quickly check it ever 3 weeks or so to see if it has been consumed and needs to be replaced.   So it is a good idea to have one spare board to give to a colony which has consumed all the candy on the board you previously put on the colony.

If you have not done so already, you should consider installing a mouse guard / entrance reducer on your hive(s).  There are not too many nice days left before the weather is scheduled to get a lot cooler here in Illinois.  So take advantage of a 60 degree or 70 degree sunny day in Illinois to check your colonies and while you are at it, install a mouse guard / entrance reducer.

Received reports of drones being run out of colonies here in central Illinois.

If you have not done so already, you need to take stock of what you have on hand to get your colonies ready for winter.  If you need anything, then you need to built it or purchase it so it is available when you need it.

Items such as a wind break on the North and West sides of a hive if it does not already have one is important.

Mouse guards.  

Do you proactively treat for Nosema Apis?  If so, do you have the medication on hand?

Candy boards will ensure the hive does not starve (but do not put them on now).

If you have a varroa problem, then you may want to initiate a treatment for varroa as soon as you get your honey supers off and treat per the directions of whatever medication you utilize (such as Api-Guard).

Do you shut off your screen bottom boards?  Some bee keepers do, some do not.

Do you have sufficient paramoth crystals to protect your stored honey supers until next year?

What do you do which is not mentioned above?

With the cool nights becoming more frequent, if you have not already replaced your screen inner covers with conventional inner covers, you should do so. 

It will help the colony keep the temperature regulated and expend less energy to do so.