We get temps down in the -20* here and have had a few nights like that already this winter, they do fine with a good coop. Have a bit of a harder time with the frizzles but they have done well too, I am sure they don't like it but they are still doing well. Have to watch there crest feathers...
Blue Jersey Giant Hens over 2 yrs old
Carmel colored Spangled Russian Orloff Hen, 1 1/2 years old
Just coming out of molt
Spangled Russian Orloff Hen, 1 1/2 years old