I would not leave them out there alone for longer than an hour or so...I take my two 3 week olds out a few times during the day while I'm gardening or whatevering. There not fenced in at this time and just kinda hangout in the tall grass where it's shady. Baby chicks don't like the sun for some reason lol at least mine don't. I wouldn't go out for the day with them in there is all I'm saying. If your home and can check on them then aure.