So I have never introduced new chicks outside with the other chicks. Few questions. The oldest is my Bantam Cochin, she is 9 1/2 weeks old. Next is the 2 EEs, and 2 RIR that are 7 1/2 weeks old. I have the group of chicks that are 5-6 weeks old. They have been outside in the grow out pen with coop during the day for the last week, but tonight they seemed really mad at me for bring them inside tonight for bed, and they chatted for over an hour, trying to get out of the brooder. I have been throwing them outside about 7am, and its usually around 55-60 outside, and they seem fine with that temp. The older girls that are outside actually lay right next to the grow out pen fence, and even sit on top of the run with the other chicks. Usually they are all laying side by side just with a fence between them, all in their little chick piles on either side of the fence, during the day.
How long do I need to have them separated till I can just let them all be together, main reason is, since the babies seem much happier to stay outside, I want to put them in the large coop with the other 5 girls at night. The small grow out coop is great, and would work great as a night time coop, but I'm afraid that if they are not in the enclosed run with the apron, I could have a raccoon dig under the run fence since there is no apron around it and get into the coop, the run is made to be easily moved. I have had some small diggings in the morning around the fully enclosed run with apron the last few mornings. So I'm glad I have the apron. Since this has happened, I have now re-designed in my head, my shipping crate coop. Its now going to be raised up at least 3 feet with an enclosed area under the coop, with an apron around it for this reason, so everyone will be locked up tightly at night. And yes, I have been locking them in the coop at night, so there is no open doors to the coop.
I'm just worried that there is a size difference, except for my Bantam, they are all the same size as her. But they really are only 3 weeks apart. I can't believe how much they really grow in that amount of time.