At what age can you tell if your "she" is really a "he"?

[Chickiee]

I know the hatchery does its best to sex appropriately, but at what age do you really know you're raising hens and not a roo or two? Please don't tell me you know when it's laying eggs. (lol) I thought I heard that if it's a roo it may start to try to crow when it's a month old?

 

[AlienChick]

Depends on the breeds (some are easier and some more difficult).
For some breeds you can notice a definite comb development in the roos.
Sometimes also the combs will be redder in roos.
For a lot of breeds you can also tell by looking (or comparing) the hackle and saddle feathers.
Otherwise, yeah, just wait till it lays an egg or crows!

 

[Elissa]

I know the hatchery does its best to sex appropriately, but at what age do you really know you're raising hens and not a roo or two? Please don't tell me you know when it's laying eggs. (lol)

I thought I heard that if it's a roo it may start to try to crow when it's a month old?

What breeds do you have? I also have new chicks and I am a chicken newbie, but I have been doing a LOT of research on the subject.

I am very anxious to be sure as well.