How early can you tell a chicks gender?

[callen0912]

I'm guessing 3 weeks is probably to soon to tell the gender of a chick? I've noticed a couple of my chicks have noticeably different tail feathers than the rest, I have a total of 5 chicks, 3 are the same breed and the other 2 are a different breed.

 

[Wyandottes7]

Three weeks is usually too young to determine gender. Tail feathers are not always an accurate sign of gender (though cockerels often do feather in slower). By the time they are 6-8 weeks old, you should be able to tell, as cockerels develop redder, larger combs.