At what age do chickens stop growing?

[esjro]

We just got back from the 4H fair, and my 5 month old Orpingtons and Australorps are nowhere big as the hens there, but they just started laying. At what age do chickens stop growing? Thanks in advance!

 

[cmom]

They stop growing up at approximately 7/8 months but will still fill out for another few months months. All birds are different.

 

[rebelcowboysnb]

If your feeding them good they can be full grown at 6 months or it can take a year or more when rashining(spelling?) food. Breeds ar different to. A production leghorn or a cornish can be grown 2 months an a new jersey giant may take well over a year.