Maybe, but I wouldn't bet money on it.My run does have a top. But if I locked my chickens in that area they would be crowded especially since it's warm out still. (They usually only hang out in the run in the winter.)
I've had chickens for 5 1/2 years and this is the first time I've seen a hawk watching my chickens.
The area where my chickens are locked up when not free ranging is about 1/3 of an acre of semi wooded land. If I tie fishing line back and forth like a cover would it stop the hawk from being able to get them?
Might want to expand their mesh covered run....it's getting close to migration season.