Last updated: July 2026 • Reviewed by The Coop Score team
Winterizing a coop means balancing insulation with ventilation, not sealing it airtight — trapped moisture causes frostbite faster than cold air alone. Follow these steps before the first hard freeze.
| ℹ️ Never seal a coop completely Even in the coldest weather, keep at least one vent open above roost height. A fully sealed coop traps moisture from droppings and respiration, which condenses on combs and wattles and causes frostbite even when the air temperature isn’t extreme. |
1. Insulate Without Blocking Airflow
Add insulation to walls and the roof if your coop doesn’t already have it, but keep high vents clear. Foam board, straw bales stacked against exterior walls, or simply thicker wood construction all help — the goal is slowing heat loss, not eliminating airflow.
2. Start the Deep Litter Method
Build up a thick layer of bedding (pine shavings or straw work well) and let droppings compost in place rather than cleaning it out weekly. The composting process generates a small amount of heat and reduces how often you need to disturb the coop in freezing weather. See our full Deep Litter Method guide for how to start it.
3. Seal Drafts, Not Vents
Check for gaps around doors, windows, and joints at roost height — these create direct drafts on roosting birds, which is different from the beneficial airflow that high vents provide. Weatherstripping or caulk around door and window frames fixes most draft problems without touching ventilation.
4. Protect Water From Freezing
- Use a heated waterer base, or plan to swap frozen waterers for fresh ones at least twice a day.
- Keep the waterer away from bedding so spills don’t create damp patches that worsen moisture buildup.
5. Check Roost Design
Use flat-topped roosts (2x4s with the wide side up work well) rather than round dowels — chickens cover their feet by sitting flat on a wide roost, which helps prevent frostbite on toes.
For coops already built with cold-weather balance in mind, see Best Chicken Coops for Cold Climates and Best Insulated Chicken Coops. For the full ventilation ratios behind this guide, see our Chicken Coop Ventilation Guide.