Seasonal care

Winter Care for Backyard Chickens: Cold, Frostbite, Frozen Water and Ventilation

Field guide · Updated October 15, 2026 · about 7 min read

Adult hens cope with cold better than many keepers expect. Extension guides spend less time on the thermometer than on the three things that make cold dangerous: damp air, wind at roost level and frozen water. This page puts their advice side by side: heat, ventilation, frostbite, water, feed and eggs, including where the sources disagree.

How cold is too cold?

Delaware State gives 55–75°F as a comfortable range for chickens; Minnesota gives 60–75°F as the range in which most poultry hold their body temperature steady. Below that, birds use feathers, huddling and feed to stay warm. Delaware State notes that an average chicken gives off about as much heat as a 60-watt bulb.

Signs of cold stress are huddling, puffed-up feathers and a foot held up against the breast (Minnesota, Arkansas). Prolonged cold stress can reduce laying and, in the extreme, kill birds (Minnesota, Delaware State).

Do hens need a heater?

Source	Position
University of Minnesota; University of Arkansas	Provide supplemental heat when coop temperatures fall below 35°F, placed at nest-box height or the lowest roost rung.
University of Maryland	Adult birds protected from wind and wet generally need no extra heat, even in the coldest weather. Bantams, molting hens and older hens may benefit from it.
Ohio State	Often unnecessary if birds are acclimated, the coop is dry and draft-free, and birds can find a warm spot.
University of Kentucky	Heat lamps can take the edge off extreme cold for a few days but are a fire hazard and can upset the lighting schedule. Deep litter plus a water warmer can keep a flock healthy below zero without other heat.

If you do add heat, the sources treat fire as the main risk:

Radiant heaters approved for poultry or livestock, on a thermostat (Minnesota).
Never hang a heat lamp by its cord; use wire or chain, since rodents chew string (Minnesota, Delaware State).
No propane or kerosene heaters near bedding and feathers (Maryland).
Extension cords only short-term; have an electrician wire the coop (Minnesota).

More on lamp fires and safer heat sources: heat lamps in chicken coops.

Ventilation without drafts

A draft is moving air at bird level; ventilation is air exchange high in the coop. Hens need the second without the first: ventilation removes moisture and ammonia, and cold, moist air leads to condensation and frostbite (Minnesota). Incoming air should mix with warmer inside air before it reaches the birds (Maryland).

Find the drafts. Check at roost height. Delaware State notes that any gap big enough to let light through lets heat escape.
Seal them with spray foam, thick plastic or a tarp (Maryland, Delaware State). If you staple plastic up, remove every staple in spring; chickens may eat them (Delaware State).
Keep an opening high up: a roof or ridge vent, or a partly opened south-facing window covered with burlap (Minnesota, Arkansas, Maryland). Ohio State adds that plastic covering fenced sides should not reach the roof, so air can still move.
Check every morning. Condensation on windows or walls, or an ammonia smell, means more ventilation is needed (Kentucky, Minnesota). Delaware State's test: if your eyes water or burn within 3 minutes with your face at bird height, clean more often.
Cut moisture at the source. Manure is about 70% water (Minnesota), so use dropping trays under roosts; fix leaking waterers and roofs (Ohio State, Maryland).

Vent near the roof lets stale, moist air and ammonia escape (Maryland, Minnesota, Illinois).
Partly opened south-facing window with burlap over it: air exchange above the birds (Minnesota, Arkansas).
Gaps sealed at bird level so no air moves the hens' feathers (Illinois, Maryland, Delaware State).
Flat wooden roost such as a 2x4, at least 12 inches above the floor, so hens cover their feet with feathers; not metal or plastic (Minnesota, Maryland, Arkansas).
Dropping tray under the roost to take out manure moisture (Minnesota).
Deep, dry litter of shavings or straw; recommended depths range from 3–4 to 6–12 inches (see table below).
Heated waterer on a stand, keeping bedding out and heating elements away from litter (Minnesota, Maryland).
Two min/max thermometers, one at bird height near the floor and one at perch height (Delaware State).
Light on a timer, added in the morning before sunrise (Minnesota).

Diagram drawn by HenClass from the Minnesota, Maryland, Illinois, Arkansas, Kentucky, Ohio State and Delaware State extension guidance cited on this page. Not to scale.

Roosts and bedding

Item	Guidance
Roost height	At least 12 inches above the floor (Minnesota)
Roost space	9 inches per bird (Minnesota); 6–8 inches (Ohio State)
Roost shape	Wood such as a 2x4 (Minnesota, Maryland), with a flat surface so hens cover their feet (Maryland); Ohio State gives 1.5–3 inches across
Litter depth	3–4 in (Maryland); 4–6 in (Minnesota); 4–8 in (Arkansas); 6–12 in (Illinois)
Cleaning	Kentucky suggests postponing clean-out until spring and top-dressing to keep litter dry; Delaware State says regular cleaning should continue to control ammonia. Minnesota allows either routine removal or deep bedding with a spring clean-out.

Frostbite: signs, prevention, first aid

Frostbite happens when fluid in the tissue freezes and the cells die (Kentucky). It mostly affects combs, wattles and toes. Affected tissue turns gray or black and feels brittle (Minnesota, Ohio State, Arkansas); Delaware State also lists yellowish blisters. Dead tissue dries, falls off and does not regrow (Kentucky).

Who is at risk: birds with large combs and wattles, especially roosters and Mediterranean breeds such as Leghorns and Minorcas; pea and strawberry combs are affected far less (Kentucky, Maryland). Kentucky ties the risk to temperatures in the single digits and below, at night, in a poorly ventilated coop with damp bedding. Delaware State notes that wattles dipping into water add to it.

A rooster with a large red comb and wattles pecking at a gravel path, with snow along the edge and in the background — A rooster out on a snowy day. Large combs and wattles like these are the parts most exposed to frostbite, which is why roosters are affected most often (Kentucky, Maryland).
Photo: Chandler Cruttenden on Unsplash

Prevention is mostly ventilation, dry litter and flat wooden roosts. Minnesota, Maryland, Illinois and Delaware State also suggest coating large combs and wattles with petroleum jelly; Kentucky says it helps with mild freezing but coop management is the main factor, and Minnesota notes it does not treat frostbite.

First aid, as described by Kentucky and Ohio State:

Warm the bird slowly. No hair dryers or heat lamps on the injury, and no rubbing.
Feet may be soaked in slightly warm water; Ohio State says not to soak the comb or wattles.
Leave blisters and blackened tissue alone unless infected; they protect the tissue beneath.
Prevent refreezing, and separate a bird whose flockmates peck the injury (Minnesota). Healing can take four to six weeks.
Kentucky says oral pain medications aren't needed and some are lethal to chickens.
Call a veterinarian if you see swelling, increasing redness, discharge or a bad smell (signs of infection, Kentucky), or for any frostbite (Minnesota, Arkansas).

Keeping water liquid

Hens drink about 3.5 times less at 40°F than on a 90°F day (Delaware State), but "water that is frozen over is not available to the birds" (Maryland), and hens stop eating without it (Minnesota). Illinois says chickens need water at least every 10 hours; Maryland and Delaware State advise checking several times a day below freezing, and Ohio State a last check in the evening.

Method	Notes
Heated plastic fount or heated base under a metal fount	Make sure it can't melt the container or ignite litter (Minnesota, Maryland).
Heated dog dish	Partly cover it so birds can't step in or drown (Minnesota).
Two waterers, swapped	Thaw the frozen one in a garage or porch (Minnesota).
Black rubber tub in the sun	Absorbs heat, won't crack, ice knocks out easily (Maryland).
Floating ping-pong balls or a sealed bottle of salt water	Keeps the surface moving (Maryland).

Delaware State suggests insulating or burying exposed pipes and hoses; electric tape carries a shock risk.

Feed, light and eggs

Feed: keep the normal balanced layer ration (Minnesota, Delaware State); Ohio State recommends a 14–17% protein pellet or crumble and about 2 pounds per hen per week. Intake rises by up to 25% (Minnesota) or about 1.5 times at 40°F versus 90°F (Delaware State). Keep grit available when snow covers the ground (Minnesota). More in feeding laying hens.
Scratch at dusk: no more than a handful per 10 birds (Minnesota) or a couple of handfuls per 10–20 birds (Delaware State); Maryland limits suet cakes to 10% of total feed intake.
Light: about 14 hours a day for laying (Minnesota, Ohio State; Illinois says 14–16). Add it in the morning, not after sunset, so birds aren't left in the dark before they find the roost (Minnesota). See supplemental lighting.
Eggs: a freshly laid egg is about 109°F but mostly water and freezes easily (Minnesota). Collect once or twice a day (Ohio State) and discard cracked or frozen eggs (Ohio State, Arkansas). Storage: egg handling and washing.

Pre-winter checklist

Fix roof leaks, seal cracks at bird level, keep a high vent open (Maryland, Minnesota).
Swap metal or plastic perches for wood; hang two min/max thermometers.
Set up a heated waterer and a spare; store extra feed in a metal can (Minnesota).
Note birds likely to struggle: old, underweight or in poor health (Minnesota), plus molting hens and bantams (Maryland).
Clear snow from the run or scatter straw (Illinois, Ohio State).