Of coarse they can make it if conditions are right and you end up with enough bees and a good enough hive configuration to prevent a freeze out. Small colonies can and will get frozen out if not prepared. As Kathy says, there is a season when the bees build comb, and it’s not now. They may build some, but you can’t force nature too much. I would hold off on feeding until after the first frost. If you feed now, they will fill valuable comb space with syrup instead of baby bees. As Kathy says, you’ve got about 2 more brood cycles before they shut down. Then the summer bees will start dying off and you’ll probably end up with something around 5 frames for winter. I’ve wintered colonies of 4 frame medium nucs here in Michigan so small can survive if insulated well enough. I’ve also wintered a few single deeps in wood hives when I’ve run out of my foam hives. They shut down earlier and die from the cold quicker in the wood hives as they are colder; but they do work sometimes. IMO, if you insulate a colony for winter, the bees to volume ratio is one of the more important attributes to control.