At what age can I safely let my chicks live outdoors? I live in Kentucky and it will be getting cold the next few months. They're puffballs right now so I know not anytime soon! 2 months or 3 maybe? I have read that they can go outside when they get their feathers, but I lost a whole group of little ones when the temp dropped, so I think they might have froze? I just hate to keep them indoors for so long and I dont want them outside if I have to keep a heatlamp going in the pen.