We are having a similar problem. Our girls are almost 7 weeks old, and this week we started letting them in the run during the day. We have an automatic coop door that opens at dawn and closes at dusk, so far all week we have been having to go out there after the door closes and chase down all 10 of them and place them in the coop. The thing is, we brooded (is that even the right word?) them in the coop since we had it set up before we got them and it was just easier. So they have been in the coop for 6 weeks, but once the door opens in the morning they run out and dont go back in until we put them in. Its been close to 90 during the day and around 65-70 at night so we took the heat lamp out when we started letting them outside during the day. We got the automatic door so we did not have to go out and put them up every night, in case we were out of town for the weekend or whatever. So how do I get them to go in the coop before the door closes and they are stuck in the run all night?
From MY experience:
Train them with "chicken candy". Mine love Black Oil Sunflower Seed (BOSS) and scratch. If we walk down toward the barn anywhere near roost time (and that can be 2 hours earlier) they come running even though all their food is stored in the barn. And they are underfoot squawking all the way to the 10 gallon trash can.EVERY NIGHT. If we need them in the barn earlier, it is usually just a matter of taking the plastic bowl with scratch out to where they can see us, shaking it and calling "Here chick, chick, chick" (which we did when we were introducing them to the "
I have CANDY!" method).
And if you want them to go in the coop once they are addicted, just let them see you throwing scratch inside. See food, CHASE food.
I do NOT think it is necessary to keep them locked in the coop for a week so they know it is "home". Ever have a house cat that gets out? TOTALLY lost, it has only seen the world from one side of the wall. They do not recognize the house as home. Same with chickens, you could leave them locked in for a year and they still wouldn't recognize it from the outside, how could they?
Put their food, water and nest boxes (not needed until they are 4 months old at the earliest) and the chicks inside the first morning. They will need some time to acclimate to the new space, depending on how much bigger it is than the brooder, they will likely all huddle in one corner because all that space is SCARY. They will start exploring after a bit. Open the door to the run the next morning. If they are little, they likely won't go far at first anyway. A lot of people have to coax them OUT of the coop early on.
They want to roost off the ground (well MOST do) so have roosts at an appropriate height for the birds. Lower when they are little, or a couple of levels so they can "graduate" to the higher roost. Mine have one at 2' and 2 parallel (18" apart) at 4 feet. None ever use the 2' one except to stage a spot on the upper ones. I also have 2 plastic pool steps attached to an angled leg supporting the roosts - put there when the girls were little and 2' was a bit of a stretch. They never touch them now and I am too lazy to take them off
If it is 90 during the day it may well be much hotter in the coop. They may not want to be in there. Open all the ventilation you can.
I also suggest having LOTS of windows. Chickens like to be able to see. Would YOU want to be stuck in a windowless room? Having windows means they will be able to see inside the coop as the sun goes down. No windows = more light outside than in. Why go in?? Mine all hang closer to the barn as it gets closer to dusk and will be in the coop long before the photo cell controlled chicken door closes. They have a natural ability to figure these things out