We've had temperatures well below zero (Fahrenheit) for several days straight now. Three nights in a row of lows down to -20 or -15. Highs around 0 or a few digits below. Wind chills down to -40.
I noticed yesterday that 2 of my 6 four-month-old hens had a tiny bit of black on their comb tips...
I have 7 chicks that are just over 6 weeks old, fully feathered except for some fuzz still on their heads. This week our temperature will drop significantly within 24 hours, from lows in the 50s (highs in 60s) to lows in the 20s (highs in 30s and 40s). Those cold temps are forecasted to continue...