At what age does the average roo start to crow? I have some that are 4, almost 5 months old and they do not crow. A cuckoo marans and a NH Red.\\ Now I am not complaining since the longer they are quiet the longer I can keep them. On the other hand I have a Porcelain D'uccle that is 10 weeks old and has been crowing for at a month. I mean he is doing his full blown crow by now and he is the tiniest little thing. I was actually very surprised that he crowed so early, but have never had experienece with this breed so maybe its the norm.