You'd be surprised how well they manage and most don't even look cold. That shocked me the first time I saw it too...nearly bald hen walking around in subzero temps and she didn't seem to mind at all...outside in the snow, in the wind, etc. Sort of like Naked Neck chickens, the molting hen's hide sort of toughens up and takes over until the feathers come in.
As for frostbit feet....I've been at this for 40 yrs and never had any, nor have I witnessed that personally. One would have to be seriously mismanaging the flock for winter to get frostbit feet, especially a rooster...they've got more feathers than all the rest. I'd venture to say frostbit feet come from closing up the roosting place too tightly in the winter months(blankets draped over it, plastic, etc), creating an area of extreme humidity. I've had a Leghorn rooster that chose to roost in a pine tree over winter in one of the coldest winters we'd ever had and didn't sustain frost bite on comb, wattles or feet. And Leghorns have HUGE combs and wattles.
Clean dry bedding, good ventilation, good food, fresh water...it's a simple concept but it's effective.