When is a chicken considered full grown?

[Jencleg]

I have 3 bantams (1) cochin hen, (1) cochin roo (1) silkie hen and then we have (1) barred rock hen. They range in ages of 4-5 months...how much more/longer will they grow?

 

[ECBW]

I think the physical size is reached. My bantams are about 5 months and I started getting mini eggs this week.

 

[Jencleg]

Eeee!! I want little eggs too!!

 

[kera!]

I think that they are to size at about 1 year..

 

[EweSheep]

One year to 18 months depending on the breed. JG are probably the slowest growing chicken next to Orpingtons.

 

[teach1rusl]

All the breeds I've had have been mostly grown by 6 months or so, but continued filling out for several more months. As was mentioned already, large, heavy breeds tend to take a lot longer to grow/fill out. Technically, pullets are considered hens after they're a year old - same with cockerels-roosters.