What you are raising matters to. Like Lacy, I started early last year, and some of the pullets are molting. The later hatches are not.
With these Catalanas last year, I did not need supplemental light for productivity or fertility. I started setting eggs as soon as I got them in Dec. and through the rest of the winter and spring. I used no lights, and the fertility was great. I do not intend to use lights anymore.
There is no reason for me to hatch in Dec. this year. These birds are pretty quick to mature, and they tolerate our summers well. There is no advantage for me to start that early. April/May hatches would be ready for the fall shows.
I have went through the pens and I am ready to go, but I will not set any eggs in the incubator until the first of March, and finish by April.