We have 10 chicks - most of them are 8 weeks old, and a 3 of them are about 8.5-9 weeks. They are fully feathered. We have been taking them out to their run for several hours a day, but nights are cold and the coop wasn't quite ready, so we take them in at night (to our basement). However, they have outgrown the brooder and the coop is ready so we moved them out tonight. They were pretty flustered to be in the coop instead of hustled into our cat carrier and taken back to the house. The squawked awful at first, but then they settled into quite peaceful chirps and then it was quiet. The night time temps are in the low 50s tonight, but this week we might be 46 -48 at night and then back to the mid 50s. My question is: how long should we keep them in the coop? Days? A week? AND: How will I know if it's too cold for them? Thank you!