Goldenrod is waning, Asters are blooming. Asters are the last show in town. But for most of us the nectar flow is over. If you haven't treated for mites do so now. Not treating for mites will more than likely lead to a dead colony by springtime. For some of us, if you haven't treated for mites yet, the bees could be so damaged they may not make it to January.
Winter Food stores. Right now a hive should have 8 full frames of honey and one partial frame of honey in the top brood box. The box underneath the top box should have about 4 frames of honey. If your hive has this much honey, it should be ample for the winter food stores. If feeding is needed get the feeders on now. Hive top feeders are the best feeders for fall and I highly recommend them. As long as the temperatures are in the upper 60's and low 70's the bees will readily take down syrup. But as the fall turns cooler, the bees will be reluctant to take down syrup, so get the feeding done now.
If you are done treating for mites, entrance reducers can be put in the hive entrance at the widest opening. This can help to prevent robbing. The weather is cooling down for the near term, and even a couple days in the low 70's will not spur any overheating of the colony.
Looking ahead, Oxalic Acid mite treatments happen in late October when hives become broodless. Winter covers are put on colonies anytime after October 31st.