I know the usual coop age is 4-6 weeks, but I've been hearing of people getting them out at 3 weeks or even younger successfully with heating, which we do have. We have 2 pullets who will be turning 4 weeks on Wednesday and another 2 that will be around 2 weeks on Wednesday. They are all feathering out very quickly and are growing like weeds. We would wait it out until the youngest are 4 weeks, as our brooder is pretty big, but our older GLW is just getting restless. We take them outside to play about every other day just to wear themselves out, but it doesn't look like that's really doing enough for our older girls. I'm in WI and the temps right now are a high of 60-70 and a low of 40-45. We have 2 coop heaters we could probably supplement them with at night. Thoughts? We're looking for the earliest possible time but we can wait it out if it means our chicks are safer.