If the run is predator proof, the chickens will be fine. Mine had access to the run 24/7, summer, winter and the door was always open even on windy days. They were healthy and happy for 4 years. I just found vinyl coated Deer fence in 6' roles that will keep all predators out. Only climbing predators need to be discouraged. My plan is 1" chicken wire over all with deer fence on the lower 6 feet with concrete footer to attach the bottom of the fence to. The only predator who could cause trouble then would be coons. I can always add heavier wire if i see any damage. Getting started on it tomorrow. Got to hurry, chicks are outgrowing the brood pens.
Very true. I may leave the door open. Right now there's a big gap between the door and the corner so not sure it's safe but the new run will definitely be and I may try that. And aw good luck with it!