I am going to be getting my first order of 17 chicks in early March. I plan to brood them indoors for a while, but I'm sure the mess will get old fast! I'm wondering when I can safely move them out to the coop since the average low temperature in March is about 32 degrees. (Average lows in April = low 40s, lows in May = mid 50s) I have read that they need to be fully feathered before they can be outside without supplemental heat. If I provide a heat lamp in the coop and keep them indoors, when do you all think it would be safe to move them out to the coop?