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What is the nighttime outside temp? We put our 3 outside in the coop when they were 4 weeks old. it was still cool here so we put the heat lamp in for a few days. after it warmed up we took the lamp out and they did just fine. they free range now, at 10 weeks. we have also blended out other 2 into the flock. they are 5 weeks old and have been staying outside for over a week now. the mixing aint going too good. the big girls kinda pick on the little ones, but they are very fast and stay away from them pretty much.
I would just keep aware of the nighttime temps, and add a lamp if necessary.