I have 3 acres, but my 14 chickens don't range over all of it by any means. Maybe slightly over an acre? it really depends on the topography. My chickens WON'T cross an open field, but they love love love an open grassy yard with big trees in. They run from tree to tree all the way to the woods -- and they go only about 10 to 20 feet into the woods.
They mostly stick to the area between the house and the coop, with the occasional wild foray into the woods across the yard.
They mostly stick to the area between the house and the coop, with the occasional wild foray into the woods across the yard.