I know when to move them outside permanently, but I forgot how old they need to be before I introduce them to the outside yard.... I'm thinking something like a week old? Or is it just 3 or 4 days old? I like taking them out to a pen in the same yard that the rest of the chickens run in, and let them stay for just an hour or so the first day, working up over several days to being out there for several hours a day, to finally just before I move them to the coop they're out there all day long. I know they can handle the coop when they can handle the outdoors all day long (with a box on its side for shelter), around 4-6 weeks depending on weather. I just don't remember how old they have to be before I move them out for that first time; this is my first time to get chicks from a hatchery, every time I've gotten chicks before they were already a week old when I got them.