Some slight frostbite on combs. Roost issue?

[ZerkerChicken]

Hey all first winter with the chickens and I'm wondering if this setup is right for winter. Just noticed some light frostbite on the comb tips nothing bad they seem to be fine no infections etc I'm monitoring it daily. But I'm pondering if the coops roost is too high/close to ventilation. I live in the mountains of northern UT and while been pretty mild thus far it still has been cold they get to free range still while the ground isnt fully covered in snow yet then once it is ill have a run open for them thats covered.

The top roost sits at about 6ft tall the lower roost is around 4ft. Its a leanto style coop I built 8foot at the back wall behind the roost, about 2 feet from the back wall to the bar, should I add some insulation at the eaves to reduce air flow a little bit? Should I move the roost down?

 

[talkinboutchickens]

I do not think that the ventilation is too close to the roosts at all. Think that when your chickens are sleeping at night, they are not standing on the roosts but rather hunched down in a little ball.
Sometimes a tiny bit of frostbite is inevitable. A lot of times its not about moisture or drafts, but just the sheer temperature.