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I don't think that's nearly enough but you can adjust as you go. I'd want to open at least the top few feet on all walls (maybe leaving predominant direction as the only full wall). The air should be as dry and crisp inside the run as it is outside. Caveat: I don't winterize at all, but I...

Is that ALL the ventilation in the run? It's likely not going to be enough to let moisture out. If you see condensation inside that will confirm it. Chickens won't die getting rain and snow on them. But moisture can lead to frostbite and respiratory issues.