Weather, food, water and good roosting area will hold birds and stop new one that come though. The birds will stay around if you have the right conditions but will move on later in the season. The birds around the house every year stay till about the first week or so into Oct. then they disapper. Nobody hunts around the house so little pressure from me thats it, this year the tanks are full, lots of crops in right now and might make the birds move around depending on the time and way they harvest this year. Most local birds will stick around for a few day atleast, but the birds that live close to town will pack their bags and move there to avoid the morning and evening traffic stops in my bird bag.