I'm going to say 4 or 5, depending on the child. Our back yard is fenced, and our front yard is on a little hill (4 steps to get to it). However, if they were playing with balls, I was usually out there, because I was afraid they'd chase them into the street.
Mine were rarely alone out there - they played together most of the time.
Mine were rarely alone out there - they played together most of the time.
