As best I can tell, 10 of them that I picked up on Saturday are about 10 days old, and the other two, that I just picked up Monday are maybe a few days younger. I'm totally guessing though. Now, I'm thinking maybe I'm rushing things a bit. They're not very old at all. These are pics I took yesterday. The two younger ones are silver-laced wyandottes - they're smaller than the other girls. The other 10 are: speckled Sussex (6), Barred rock (1); Red Cross (1), Buff Orps (2).
Hm, they do seem like they could be a little young but I think as long as the sun is out they can go out, especially since it's pretty warm maybe you could run MHP out there though just in case? Or do what june said and keep them out for very short times. After all, momma would probably have them out from day one