Are they in their coop or still in a brooder? With the weather we're having here in the midwest - mine will be popsicles by the time they are old enough to go to the coop!
I was going to let mine outside for the first time today--- they are five weeks old--- the the air temp is 47 and the wind chill is 42 --- very windy---
I guess I will wait til tomorrow at least the sun is supposed to shine