My hawks in my area seem to be out all times of the day. I let the girls out when I have time in the day to keep an eye on them.
When I am more busy I toss one or two of their buddies out to keep an eye on them. I am not foolish enough to think they will protect them
from a hawk, but I do know they will sound the alarm and the black Spaniel would have no humor about something near his flock.
My advise is if your going to free range, use a hoop house and move it daily or every few hours. If you do not have the time to watch them.
I have a lot of hiding places for the ladies to help them get away if need be. At my house, I take full responcability if a hawk swoops down and gets one. The risk is worth it to me as I have less bugs, less weeds, less ticks, fertilizer and better tasting eggs then chckens that do not get to forage around. I go to great lengths to watch the ladies and protect them.
Free ranging has its risks and we need to accept them. I would hate to have a hawk get one of my girls and would be heartbroken as I love them all. But, I am extremely happy with their quality of life.
Good luck to you
The lady with 4 dogs, 4 city chickens, 2 meat rabbits and a lizard