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What part of MA are you in? I.e. how cold is most of your winter (coldest lows, and typical January day temps).
I don't know about exact numbers, it's not like there's a specific sharp cutoff. Somewhere that gets below freezing at night but often above freezing during the day, probably not so bad. Somewhere that's usually below freezing but not *lots* below freezing, it's not exactly doing your birds any favors but you may not have major problems. If you get a LOT below freezing and have many days like that, though, it's kind of a kick-me sign to have chickens forced to stand/walk on a surface that is extremely conductive and high-thermal-mass (i.e. "sucks the heat right out of their feet"). I don't know what to tell ya about numbers, it's a judgement call I guess.
Pat