What I saw this year on 30+ year old fig in a greenhouse is that some will and some won't. It had some figs quarter sized and I remember 1 ripening and the rest did not, although I could have been confused which was new and which was not, for the most part none of them did ripen (if none at all if my mind is playing tricks on me) but this paticular fig may see -2 or -3 and that is about it, it doesn't get a frost formed on it though as it is in a covered greenhouse very close to the wall next to the boiler which may not run during the winter but the owner of the greenhouse lets the pilot light burn and stays around when the greenhouse gets too cold.