How cold is too cold for chickens?

Acclimated, dry, and out of the wind, standard breeds shrug off zero and below, ours have. The birds that get hurt are wet ones, drafty-roost ones, and big-combed breeds in sealed humid coops. Fix the air, not the temperature.

Should I insulate the coop?

Nice, never necessary, and only with the vents still open, insulation plus sealed vents makes a frostbite sauna. If you insulate, cover it, hens strip and eat exposed foam.

Why did laying stop in November?

Daylight, not cold. Hens need about 14 hours of light to lay steadily. We let ours rest and take the winter dip. A few hours of pre-dawn LED on a timer keeps them going if eggs matter more, use morning light, not evening, so nobody gets stranded off the roost in the dark.

Field Guide · The flock · 7 min read

How to Winterize a Chicken Coop

Cold does not hurt chickens, but damp air and heat lamps do. Winterizing is mostly about not overdoing it.

Written on the farm by Nathan Story · Story Thyme Farms, Missouri · Updated August 2026

Story Thyme Farms · Bench cardBefore first hard freeze

Winterizing the chicken coop

Vents open up high, dry bedding below, and no heat lamp

DifficultyOne weekend

VentsOpen, above the roost

Heat lampsNever. Fires.

WaterThe real winter chore

Do not use heat lamps. One clamp coming loose over dry bedding will burn the coop down.

1AirflowBlock drafts down low, keep vents open up high

2The beddingUse deep litter for warmth from underneath

3The roostsUse wide roost bars so feathers cover their toes

4HeatingDo not use a heat lamp, ever

5WaterKeep the water from freezing

Materials needed · Heated waterer · Pine shavings · 2x4 roost brackets · Petroleum jelly

Written on the farm · Missouristorythymefarms.com/guides/how-to-winterize-a-chicken-coop

Prints on one page. The long version below stays on the screen.

The long version

Watercolor plate of a snug coop in light snow with hens on a straw path — Vents open up high, dry bedding below, and no heat lamp · field plate

A chicken wears a down coat all year and runs a body temperature of 105 °F. What causes frostbitten combs is not the cold itself, it is damp air in a sealed-up coop condensing on them overnight. So winterizing is the opposite of what instinct suggests: block drafts at the height the birds sit, and leave the vents up high wide open.

Step 1 · Airflow
Block drafts down low, keep vents open up high
Walk around the coop on a windy day. Seal any gap that blows air across the roost. Vents near the roof, above the height the birds roost at, stay open all winter, because they carry out the moisture from a night of breathing and droppings. If the windows fog up, or ammonia stings your nose at dawn, you need more ventilation rather than less.
Step 2 · The bedding
Use deep litter for warmth from underneath
Winter is the season for deep litter: six inches or more of dry shavings and straw, slowly composting and giving off a little heat under the flock. Keep it forked over and keep adding dry bedding, and it doubles as somewhere for the birds to scratch on bad-weather days.
Step 3 · The roosts
Use wide roost bars so feathers cover their toes
A 2x4 with the wide side up lets hens sit down on their feet, so their feathered bellies cover the one part that can get frostbitten. Some people smear petroleum jelly on large single combs near freezing, but it freezes solid in single digits and does nothing there. Dry air is the real protection. Cold-hardy breeds with small pea combs are not affected at all.
Step 4 · Heating
Do not use a heat lamp, ever
Heat lamps burn coops down every winter, and one loose clamp above bone-dry bedding is all it takes. A flock kept warm also loses its tolerance for cold, which becomes a problem the moment the power goes out. A dry, draft-free flock that is used to the cold handles below-zero nights without trouble. If you genuinely need to add warmth for a sick or elderly bird, a flat-panel radiant heater is the only device worth the risk.
Step 5 · Water
Keep the water from freezing
The real daily job in winter is dealing with ice. A heated dog bowl or a heated poultry waterer solves it for very little electricity. Feed a little extra scratch grain at dusk, because digesting corn overnight helps keep the birds warm, and collect eggs twice a day in the coldest weather before they freeze and crack.

Materials needed

Heated waterer Pine shavings 2x4 roost brackets Petroleum jelly

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Questions we actually get

How cold is too cold for chickens?: Acclimated, dry, and out of the wind, standard breeds shrug off zero and below, ours have. The birds that get hurt are wet ones, drafty-roost ones, and big-combed breeds in sealed humid coops. Fix the air, not the temperature.
Should I insulate the coop?: Nice, never necessary, and only with the vents still open, insulation plus sealed vents makes a frostbite sauna. If you insulate, cover it, hens strip and eat exposed foam.
Why did laying stop in November?: Daylight, not cold. Hens need about 14 hours of light to lay steadily. We let ours rest and take the winter dip. A few hours of pre-dawn LED on a timer keeps them going if eggs matter more, use morning light, not evening, so nobody gets stranded off the roost in the dark.