Fresh air, not a sealed box: the winter ventilation trade
Frostbite is mostly a moisture problem
Dr. Jacquie Jacob's frostbite guide for the national poultry extension site is blunt: frostbite is most likely in a cold, poorly ventilated coop with damp bedding, and it targets combs, wattles and toes - roosters and large-combed breeds first. If it happens, her advice is slow warming, no rubbing, no trimming blackened tissue, and a watch for infection. Healing takes four to six weeks. Prevention beats every part of that.
Ventilation without drafts
University of Minnesota Extension separates the two ideas that get tangled here. Drafts are uncontrolled leaks - holes and cracks to seal. Ventilation is deliberate air exchange high in the coop: roof vents that let moist air leave, a partially open south-facing window, burlap over an opening to soften the flow. Their test is your nose and eyes: if you smell ammonia or see condensation on windows and walls, the coop needs more air moving, not less.
Instead of stripping the coop every week, the deep litter method lets bedding build up and break down in place. Done well, it makes its own heat. Done carelessly, it makes ammonia. The difference is management.
Bedding and manure are water
UMN notes that chicken manure is about 70 percent water, which makes manure management moisture management. Manure trays under roosts make daily removal easy. If you run deep bedding through winter, it needs stirring and dry top-ups so the surface stays friable, never caked or wet - the composting warmth only helps while the top stays dry.
Think twice about heat lamps
Both sources treat supplemental heat as a last resort with a real cost. Heat lamps are a leading cause of coop fires, and light at night can disrupt laying. If heat is genuinely needed in extreme cold, UMN recommends radiant panels or properly guarded, correctly installed units - wires away from birds, water and litter, no permanent extension cords, and an electrician for any real wiring.
Note the morning conditions
A quick dated note at morning chores - condensation on the window, ammonia smell, dry bedding surface - tells you whether your ventilation is keeping up as temperatures swing. PawLine's daily notes can hold those dated observations for the flock; coop conditions and equipment logs may still belong in your own farm record, and no coop-monitoring feature is claimed.
Keep the bedding log with the flock. Note when you added bedding, when you stirred and any ammonia smell. PawLine offers daily health notes and animal profiles for your own flock observations; coop bedding and maintenance records may still need a separate farm log, and no pen or equipment-tracking feature is claimed here. A small log tells you whether your routine is keeping up. Get PawLine on iPhone or Get PawLine on Android.
Questions about this guide
Won't open vents make the coop colder?
That is the trade Minnesota Extension asks you to accept. Birds in good feather handle cold far better than they handle damp, ammonia-heavy air. Ventilation high in the coop removes moisture without drafting across the roosts.
Is petroleum jelly on combs enough?
The University of Kentucky frostbite guide calls it a mild help at best and says coop management is the real key: dry bedding, ventilation, and unfrozen water.
When does frostbite need a vet?
The extension guidance is to warm slowly, watch for swelling, redness, discharge or odor, and limit further cold exposure. Signs of infection, or frostbite affecting the feet severely, are reasons to call a veterinarian rather than manage alone.
Sources
Sources checked October 27, 2026. Suggested routines and note formats are editorial organizational ideas.
- Caring for chickens in cold weather
University of Minnesota Extension - Frostbite in chickens
Small and Backyard Poultry, eXtension (Dr. Jacquie Jacob, University of Kentucky)