Oh, no, the yard is not predator proof, the wire is to keep them from jumping out and over the 4' fence and to deter hawks.
The coop is completely enclosed with double half inch hardware cloth and all of the doors are double locked with a clasp and a hook and latch.
The run is completely enclosed and 1/2 inch hardware cloth with the two foot skirt all the way around and the door to the coop as a clasp and lock.
The 30'X4' yard is not predator-proof, it is more of a mock free-range area where they are still contained and somewhat protected during the day. At night, they go back in the little door from the yard into the run, then from the run into the coop. I close and lock all of the doors before sundown.