How to Keep Chickens Warm in Winter (Without Risking a Coop Fire)

Quick answer: you keep chickens warm in winter by keeping them dry and out of the wind, not by heating the coop. Give them a draft-free coop with vents up high, deep dry litter, wide flat roosts, unfrozen water and a handful of scratch at bedtime, and healthy adult hens of most breeds will handle temperatures well below freezing without a heat lamp.

So yes, chickens can survive winter, even a hard one. Each fall I get the same worried question from friends who are new to backyard chickens: “Do I need to put a heater out there?” Almost always, the answer is no. A chicken runs at around 106°F and wears a built-in down coat. What actually hurts hens in winter is damp air, wind on the roost, frozen water and, far too often, a heat lamp that starts a fire.

Can Chickens Survive Winter?

Yes. Adult chickens with full, healthy feathers can survive temperatures well below 0°F as long as they are dry and sheltered from wind. They fluff their feathers to trap warm air, tuck their heads under a wing, and sit down over their feet on the roost so no bare skin is exposed.

The birds that struggle are the ones that are wet, sick, molting, very young, or small. Bantams, chicks and hens halfway through a molt need extra help. A lone chicken has a harder time too, because hens share body heat when they roost shoulder to shoulder.

How Cold Is Too Cold for Chickens?

Want the full temperature chart by breed and age? See how cold chickens can tolerate.

There is no single magic number, because wind, damp and breed matter more than the thermometer. These are the rough bands I use for adult, dry, fully feathered hens:

The University of Minnesota Extension recommends mounting a thermometer at roost height so you know what the birds actually feel, and only considering a poultry-rated radiant heater when the coop itself stays below about 35°F (UMN Extension, caring for chickens in cold weather).

Ventilation vs. Drafts: The Key to Preventing Frostbite

This is the part most people get backwards. They seal the coop tight to keep warmth in, and then their hens get frostbite. A flock breathes out a lot of moisture overnight, and chicken manure is about 70% water. In a closed coop that moisture condenses on walls and settles on combs and wattles, and damp skin freezes far faster than dry skin.

Ventilation is airflow above the birds. A draft is wind blowing across the birds. You want the first and never the second.

• Vent high. Put vents near the roofline or in the eaves, well above roost height, so warm, damp air rises out. A common rule of thumb is about 1 square foot of vent per 10 square feet of floor, and more for big flocks.
• Block low wind. Seal cracks at roost level and below with caulk or expanding foam before the weather turns icy, because sealants do not set well in the cold.
• Do the hand test. On a windy evening, hold the back of your hand where the hens sleep. If you feel air moving, cover that spot.
• Watch for frost. Frost on the inside of the walls or windows, or a smell of ammonia in the morning, means you need more ventilation, not less.

Wrapping the outside of the coop in a breathable house wrap is another option. It cuts wind but still lets moisture vapor escape.

Use Deep Litter to Keep the Floor Warm and Dry

Step-by-step setup, best bedding and cleanout: see my deep litter method guide.

In winter I switch to the deep litter method. Start with 4 to 6 inches of pine shavings or straw on the floor, then add a fresh layer on top whenever it looks soiled instead of mucking it all out. Toss a little scratch on it and the hens turn it for you.

Done right, the bottom layer slowly composts and gives off a little gentle heat, and the top stays dry. The catch is moisture. If the litter is wet, clumpy or smells of ammonia, stir it, add fresh material and improve the airflow. If you are deciding what to use, here is my guide to the best bedding for chickens.

Set Up Roosts So Feet Stay Covered

A good roost does more to keep chickens warm at night than almost anything else. Turn a 2×4 board flat side up so the hens sit down over their toes and cover their feet with their belly feathers. Round dowels and narrow perches leave toes exposed.

• Keep roosts at least 12 inches off the floor and higher than the nest boxes, so hens sleep on the roost rather than in the boxes.
• Allow about 8 to 10 inches of roost per bird. In winter a little crowding is fine, because they share warmth.
• Never use metal or plastic perches. They hold the cold and can cause frostbite.

There is more on spacing and height in my guide to chicken roosts, and on toes in particular in do chickens’ feet get cold?

Do Chickens Need a Heat Lamp in Winter?

I don’t, and I would gently talk most people out of it. Heat lamps start a lot of coop and barn fires every winter. A 250-watt bulb sits inches from dry shavings, straw and dust, and a hen only has to knock it once. A coop fire takes your whole flock, and it can take a barn or a house with it.

Heat lamps also cause a quieter problem. Birds that are kept toasty never acclimate, so if the power goes out on the coldest night of the year, they are in far worse shape than hens that adjusted naturally.

If you have a real reason to add heat, such as bantams, a sick hen, an old bird or a long cold snap below 0°F, use something designed for it:

Whatever you choose, follow the basics from UMN Extension: hang it with a chain, never by its cord, keep cords away from birds, water and litter, and do not run a coop off an extension cord all winter. Add a thermostat so it only runs when it has to.

How to Keep Chickens’ Water from Freezing

Ten methods compared, with and without electricity: how to keep chickens’ water from freezing.

Frozen water is the winter chore that wears everyone down. Chickens drink less when the water is ice cold and stop eating when they have nothing to drink, and laying hens can get dehydrated fast. Here is more on how long chickens can go without water.

• Heated waterer or heated base. This is the easiest fix if you have safe power at the coop. A thermostatic heated base under a metal fount, or a heated plastic waterer, only switches on near freezing.
• Heated dog bowl. Cheap and reliable. Partly cover it so hens do not stand in it and get their feet wet.
• Two-waterer swap. No power? Keep two rubber or plastic waterers and swap a frozen one for a warm one each morning and afternoon. Rubber freezes slower than metal and is easy to pop the ice out of.
• Ping pong balls. In weather just below freezing, a few floating balls keep the surface moving and slow ice. They stop working in a hard freeze.

Keep water outside the coop or raised on a stand if you can. A spilled waterer means wet litter, damp air and frostbite risk.

Build Wind Breaks Around the Run

Chickens still want to go outside in winter, and they should. Wind is the real problem in the run, so I give them somewhere to get out of it.

• Wrap the windward side of the run with clear plastic sheeting, tarps or straw bales. Leave the top open for airflow.
• Lay straw or wood chips over snow near the pop door. Many hens refuse to walk on snow at first.
• Add a sunny, sheltered spot. On bright days you will find the whole flock sunbathing there.

Keep the pop door open while they are out so they can head back in when they want to.

What Are the Most Cold-Hardy Chicken Breeds?

All 16 breeds compared by comb, size and winter laying: cold hardy chicken breeds.

Breed makes a big difference. Heavy, fluffy birds with small combs keep heat best. Light birds with tall single combs lose it fast and get frostbite more easily. If you live somewhere cold, this is worth thinking about before you buy chicks. My chicken breeds chart compares 21 breeds, including hardiness.

What Should I Feed Chickens in Winter?

Full feeding schedule and safe treats list: what to feed chickens in winter.

Chickens burn more energy staying warm, and UMN Extension notes feed intake can rise by up to 25% in cold weather. Keep their regular layer feed in front of them all day, and keep grit available all winter, since they are finding fewer pebbles under the snow.

• Scratch grains at bedtime. A small handful per 10 birds in the late afternoon gives them something to digest overnight, which helps keep them warm on the roost. Treat it as a treat, not a meal.
• Extra protein. Dried mealworms or black oil sunflower seeds help, especially for hens finishing a molt.
• Some greens. Cabbage, kale or other greens give them something fresh to pick at.
• Stock up. In northern states I keep a few weeks of feed on hand in case a storm keeps me from the feed store.

Store feed in a metal can with a lid. Mice and rats move into coops in winter, and they will chew through a feed bag overnight.

Signs a Chicken Is Too Cold

Fluffed feathers and hens huddled together are normal on a cold night. These are the signs I watch for:

• A hen hunched and fluffed in a corner during the day, away from the flock, with her eyes closed
• Not eating or drinking, or not coming out when the others do
• Shivering, or feeling cold to the touch under the wing
• A comb that is pale, gray or dark at the tips, which can be early frostbite
• Wet or matted feathers, especially on Silkies and feathered-foot breeds

If you find a chilled, wet hen, bring her somewhere sheltered, dry her gently with a towel or a hair dryer on low, and let her warm up slowly before she goes back out. A cold hen is often a sick hen first, so check her over for signs of illness.

How Do You Treat Frostbite in Chickens?

Signs by stage, treatment steps and prevention: frostbite in chickens.

Frostbite turns comb tips, wattles or toes gray, then black and brittle. Do not rub it or thaw it fast with hot water. Move the bird to a dry spot, let the tissue warm gradually, and keep her apart if flockmates peck at the damaged area. Do not cut off blackened tips yourself. They usually fall off on their own as the tissue heals, and a vet should look at anything that swells or smells.

A thin coat of petroleum jelly on big single combs before a deep freeze can help prevent frostbite, but it does not treat it. The real prevention is a dry coop. You can read more about common chicken comb problems here.

Do Chicks and Bantams Need Heat in Winter?

Yes, chicks do. Chicks cannot regulate their own temperature until they are feathered, at around 6 weeks old. They need about 95°F in the first week, then roughly 5°F less each week. A brooder plate is far safer than a heat lamp. Don’t move young birds out to a cold coop until they are fully feathered and outside temperatures are reasonable. See how to raise baby chicks without a hen.

Bantams have less body mass to hold heat and smaller feet that can get cold more easily. Most do fine in a dry, draft-free coop, but they are the first birds I would give a radiant panel to in a deep freeze. Molting hens need extra protein and a dry coop until their new feathers come in.

Other Winter Dangers for Backyard Chickens

Predators

Hungry foxes, hawks and owls hunt harder when food is scarce. Snow also shows predators exactly where your flock is. Close the coop every night and check the run for dug or torn spots after storms.

Rodents

Mice and rats move into warm coops in winter. Store feed in metal bins, pick up spilled feed, and do not leave bags lying around.

Mold and Ammonia

Hens spend more time inside in winter, so the litter gets dirtier faster. Keep it dry and skip storing hay bales in the coop, which get pooped on and go moldy. Moldy feed or bedding can cause respiratory trouble.

Fewer Eggs

Short days slow laying. That is normal, not a sign of cold stress. Here is why hens stop laying eggs in fall and winter and what you can do about it.

The Bottom Line

Keep them dry, out of the wind and well fed, and you will likely find, like I did, that your chickens are tougher than you think. For more on coop setup, see the parts of a chicken coop and how much space chickens need. For a vet-level overview of backyard flock housing and health, the Merck Veterinary Manual is a good reference.

Frequently Asked Questions