How to keep chickens warm in winter

Keeping chickens warm in winter is mostly about keeping them dry and out of moving air. Those two things do more than any heater, they cost almost nothing, and they are what the extension services recommend. Here is the list in order of how much difference each makes.

1. Deep, dry bedding

University of Minnesota Extension recommends a deep 6 to 12 inch layer of dry bedding on the coop floor in winter, because it provides insulation and helps keep the birds' feet warm. This is the single highest-value change available and it costs the price of bedding.

The word doing the work is dry. Wet litter at six inches deep is worse than dry litter at three, because it raises humidity. Keep the waterer out of the coop, scrape the droppings board daily, and top up rather than letting it compact.

2. Seal drafts — at bird level only

MSU Extension recommends inspecting the coop for holes and cracks that allow air to flow freely in, and notes that sealing them prevents both cold drafts and rodents getting in over winter. Go round the coop on a windy day with a hand at roost height and find the places air moves. Seal those.

3. Leave the vents open

The step people undo in November and should not. Moisture from breath and droppings has to leave the building. Trapped humidity condensing on combs in cold weather is what causes frostbite — Extension's frostbite guidance is explicit about the mechanism. Vents belong above the birds' heads so air leaves without crossing the roost. Full ventilation guide.

4. Wooden roosts, flat side up

Roosts keep birds off the cold floor and let them sit down on their feet, covering them with body feathers — which is how a hen keeps her toes warm. University of Minnesota Extension specifically advises wooden 2x4 or 2x2 boards and avoiding metal, plastic and other materials that retain cold and may cause frostbite.

A flat 2x4 with the wide face up is better than a round pole in winter, because the bird can rest her whole foot flat and cover it.

5. Liquid water, always

Not strictly warmth, but the highest-priority winter item regardless. Intake falls in cold weather but does not stop, and a hen that cannot drink stops laying within a day. Heated waterers and how to stop water freezing.

6. Feed freely

Extension feeding guidance notes that intake rises in cold weather because birds consume more to supply the extra energy needed to maintain body temperature. Keep feed available continuously and expect to buy more of it. Do not restrict feed in winter.

What helps

The two bedding options that do most of the work, the ammonia binder that keeps deep litter usable, and the heated waterer that is the one genuine winter necessity.

#1 · Low dust in a small or poorly ventilated coop

$74.95·on Amazon

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RentACoop Premium Hemp Bedding, 300L

RentACoop

8.0/10★★★★☆Assessed on specs and owner reports

300 liters of hemp hurd per 30 lb bale. Hemp costs more than pine up front but absorbs more per liter and throws far less dust — which is the thing that actually damages chicken lungs.

Published specifications

Material	Hemp hurd
Volume	300 L
Weight	30 lb
Intended use	Chickens, rabbits, horses

Specifications per Manufacturer figures as published on the Amazon product listing, as published at the date above.

What it does well

• Volume and weight both published, so the real cost per liter is comparable
• Markedly less dust than pine — the single biggest respiratory factor in a closed coop
• Absorbs more liquid per liter than shavings, so the litter stays drier between changes
• Composts readily

Where it falls short

• Costs several times what an equivalent volume of pine does
• Finer particles can sift through widely-spaced slatted floors
• Not stocked in most feed stores, so you are ordering it

Our rubric

Fit for purpose

9.0

Mess and waste

8.0

Quality

9.0

Value

6.0

#2 · The default coop and nest-box bedding

$35.99·on Amazon

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Small Pet Select Pine Shavings Chicken Bedding

Small Pet Select

7.8/10★★★★☆Assessed on specs and owner reports

Kiln-dried pine shavings in a bag sized for a coop rather than a hamster cage. Pine is the baseline bedding for a reason: absorbent, cheap, compostable, and it does not mat.

Published specifications

Material	Pine wood shavings
Intended use	Coop floor and nest boxes
Volume	Not published by manufacturer
Dust level	Not published by manufacturer

Specifications per Manufacturer figures as published on the Amazon product listing, as published at the date above.

What it does well

• Absorbent enough to run a deep-litter floor for weeks between full changes
• Composts down with the manure into usable garden material
• Shavings stay loose, so hens can scratch and dust-bathe in them

Where it falls short

• Dustier than hemp, which matters in a tight coop with poor ventilation
• Volume per bag is not published, so cost-per-liter is hard to compare
• Blows out of an open-sided run

Our rubric

Fit for purpose

9.0

Mess and waste

6.0

Quality

8.0

Value

8.0

#3 · Ammonia under the roosts

$24.95·on Amazon

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Sweet PDZ Coop Refresher, 10 lb

Sweet PDZ

8.8/10★★★★◐Assessed on specs and owner reports

Granular zeolite that binds ammonia rather than masking it. Dusted on the poop board under the roosts it is the most effective single thing you can do about coop smell.

Published specifications

Active material	Zeolite
Weight	10 lb
Function	Ammonia and odor absorption
Scent added	None

Specifications per Manufacturer figures as published on the Amazon product listing, as published at the date above.

What it does well

• Chemically binds ammonia instead of covering it with fragrance
• No added scent, which matters because fragrance oils irritate bird airways
• A thin layer on the poop board is all it takes — a 10 lb bag lasts a small flock months
• Safe to compost with the litter

Where it falls short

• It is a granular mineral: it will not fix a coop that is genuinely under-ventilated
• Needs topping up as it saturates
• Dusty to apply — worth doing with the hens outside

Our rubric

Fit for purpose

10.0

Mess and waste

7.0

Quality

9.0

Value

9.0

#4 · A purpose-built heated waterer that just works

$42.99·on Amazon

$49.99 14% off

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Farm Innovators HB-60P Heated Poultry Waterer, 2 Gallon 60W

Farm Innovators

7.2/10★★★◐☆Assessed on specs and owner reports

Two gallons with a 60-watt thermostatically-controlled element built in. Published wattage, published capacity, and the heater is integrated rather than bolted on — the fewest failure points of any heated option.

Published specifications

Capacity	2 gallon
Heater	60 W integrated
Control	Thermostatically controlled
Type	Heated drinker

Specifications per Manufacturer figures as published on the Amazon product listing, as published at the date above.

What it does well

• 60 W is published, so you can work out the running cost rather than guess
• Thermostat means it only draws power when it is actually near freezing
• Integrated heater — no separate base to misalign or water to spill onto
• The most widely used heated poultry drinker in US backyards for a reason

Where it falls short

• 2 gallons is a daily refill for anything above about six hens in winter
• Needs an outdoor-rated extension run to the coop, properly protected
• A permanently plugged-in appliance in a dusty coop needs checking each season

Our rubric

Capacity

5.0

Stays clean

7.0

Freeze resistance

10.0

Ease of refill

7.0

Value

7.0

Things worth doing that are lower down the list

• A wind break on the run — a tarp or boards on the prevailing-wind side. Birds will use the run far more in winter if it is not in the wind.
• Clear a patch of ground. Hens dislike walking on snow. Sweeping or covering a small area keeps them active.
• Keep the pop-hole open in daylight unless it is genuinely extreme. Fresh air and daylight are good for them.
• Check feet and combs weekly. Early frostbite is much easier to manage than late.
• Do not shut them in for days. A closed coop gets damp fast, which is the thing you are trying to avoid.

Breed matters at the margins

Large single combs are the most frostbite-prone feature on a chicken, so breeds with small or cushion combs cope better in severe winters. That is a selection consideration for the future rather than something you can change now, and a dry coop does more for the birds you already have than breed choice would. Breeds for beginners.