I have 9 chicks that are just over a month old. I'm thinking about putting them outside soon, but i'm not sure exactly when. The weather is nice here. The only problem might be that I have some older hens that I am going to move them in with. I know that you are not supposed to, but I have put several batches of chicks in with my older girls when they were just over a month old. My hens are very friendly and there was hardly even a peck involved with the transition. Please let me know your thoughts on this. Thanks so much!