when to let new chicks fee range

I have two cochin chicks (unsure yet if pullets or roos) that I finally merged with my laying girls last night. The chicks are only 10 weeks but I don't have room inside and no electric outside so I did the crate inside the run for two weeks thing, did allow them some supervised together time twice, then last night after the girls had gone to bed, I scooped up the babies from their little makeshift shelter and dumped them into the coop. Closed it up which I have never done but wanted them to stay put- and crossed my fingers. This am early- I opened up the coop and went to bed (work overnight). When I got up at noon everyone seemed ok. The babies were staying together but not being harassed at all. I just went out now with some corn muffins and grapes and everyone came running. The babies were a bit jumpy and the big girls were a little pushy but not bad at all. However, my big concern now is when to trust them to come back. I free range my girls maybe three times a week for a few hours each time and they obviously are quite used to the routine. They also are not spooky. The babies are because I didn't get to handle them much. I don't need to snuggle my chickens but I don't want them to bolt when I walk by and they are still a bit jumpy at this point. I am nervous that they wont come back in with everyone else. Also will they follow the big girls into the coop to go to bed? I don't know if they can get to the roost, but at least its warmer in there. That was the main reason I finally took the plunge... its been right around freezing the last few nights and I was nervous for their well-being. I am going to up the "the goodie visits" to twice a day(usually its only every other and then a small snack to bring them in), but will they simply follow the bigger girls as far as being not so nervous around me, and heading for the coop when its time to go to bed? Ugggg....so never doing chicks again LOL

 

I didn't let them out today. Sundays are an easier day for me- only work one job in the days time instead of two so it usually is a day I let the girls out but I didn't specifically because of the youngsters. The actual coop is 5 x 5 with a sloped roof that is 5 ft at the peak. It is attached to a run made of chain link that is cant even guess the square footage of. It is one 5 ft long panel and I think 7 or 8 10 footers. It isn't square though- its squared off at the end with the coop= but then the pieces are set up based on some slight hills and valleys in the ground so as to keep less space between the bottom of the chain link panel and the ground. I have no doubt the run space is plenty for them- and think the coop is too-just wasn't sure they would reason like the older girls (and you do) "alone with predators vs company of chickens". Hoping they will- but if the girls bullied them to much during the day-didn't seem so to me though- they might not choose the company of other chickens. WIll check on them before I go to work and hope they are inside. TY for the info.