My silkies r about 2 months old and have been in at night since they were born they go out during the day. the temps r going into the high 30's lower 40's at night we have hen houses that the little ones can get into. R they old enough to stay outside, They r in my closed in garage which is now somewhat of a nursery for baby chicks. They r really stating to smell bad even though I clean constantly. They R a good size.