Sorry I couldnt give you a more detonate answer on the winter subject...I haven't been into buttercups for cold weather...I can tell PDPercherons though that my bantam buttercups are actually larger than I would've thought...they are even bigger than my Ancona Bantams... And I will tell you that those are pretty small,but both breeds have large combs...and I wouldn't think winter would go over well...but that is what I have issues with,and we had to put down seven chickens one winter due to frostbite... They had there legs,toes,and feet frostbitten, as well as combs and wattles...that was the winter we had temps dropping 14 below or more...