I have an indoor and an outdoor coop connected by a guillotine door, which stays open all night. Both pens are predator proof, even from snakes (metal roof, 1/4" wire mesh sides and a 3 ft skirt to prevent digging). Both coops are rainproof and have an 8' roost. My chickens don't want to stay on the outside roost, but a few times I have locked some of them out on purpose.
I'm in the middle of the desert with abundant coyotes, so just in case one would scare them to death pacing back and forth or trying to bite through wire, I also have a driveway alarm outside their pen to alert me in the house if there's a ruckus.
I'm a little nervous when I've locked some in the outdoor coop, but the alarm hasn't yet gone off, and all has been well. But still, for some reason, none have chosen to roost outside. I think if your outdoor space is absolutely predator proof, and they like it, why not?
p.s. Coyotes can clear 7-8' fences with ease.
Here's my outdoor coop. The indoor coop is inside the barn.
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