If you have bird houses, now is a good time to take them down and spare them the winter weather. Make sure to get them back out around the first of February.
Once you get them down, take time to clean them out and make any necessary repairs. THEN put them away. But don't forget they're there!
Also . . .
Remove your Hummingbird feeders. Bring them in and again, clean them before putting them up. Taking them down removes any incentive for them to stay around longer than they should. They must migrate to avoid freezing temperatures, which kill them.
Bird baths . .
You will want to take your bird bath bowls (removable ones) and flip them upside down or bring them indoors. You don't want them to have water in them when temperatures fall below freezing. That can cause cracks and leaks.