My chicks are 4 weeks old now and I have had them in the coop with a heat lamp since I got them and they have done fine even with night lows down to the high 20s. It seems like summer is finally starting to come around with highs in the 70s and even a couple days next week that are supposed to be in the 80s. I have started to let the girls into the run during the day and I've noticed they spend most of their time eating grass. They are still eating their starter food but not as much obviously since there is a new source of food all the sudden. Im just wondering if they are getting the right stuff to keep growing well. Should I limit their outside time so they don't fill up on grass and eat more of their normal food?