I never had a problem with hawks. Maybe it was the bigger chickens, or the crows. The hawks around that I've seen are not very big. I have seen a bald eagle swoop thru my yard once. But one day, I had a singleton about 11 weeks old, and put her outside for fresh air, and came back and she was missing her head and gutted, and the hawk flew off when he saw me. I cried for days.