I don't know if they will wait until spring or not, but the shortening days have not seemed to affect my pullets at all. I have 11/13 that are laying now, one just started last week. The two that are not laying look close to starting. If they don't, I don't believe I will worry about it too much because I can't keep up with our eggs now as it is. I've been giving them away left and right. We average 8 eggs a day. I have one day a week where I only get 6, and one day a week that I get 10, almost like clockwork.