What counts as cold stress?
Cold stress happens when an animal burns more energy to stay warm than it can take in as feed. The air temperature alone does not tell the story. Extension winter guidance from several states points to wind, wet hair or feathers, mud, and lack of shelter as the factors that make an ordinary cold day dangerous.
A dry animal with a thick winter coat can tolerate far lower temperatures than a wet one. Rain followed by a freeze, or snow that melts into the coat, strips away insulation and raises the risk quickly.
Young animals, thin animals, older animals, and those that were recently sheared or moved from a warmer climate have less reserve. Watch them first.
What shelter do animals need?
The most useful shelter is a windbreak and a dry place to lie down. A three-sided shed facing away from prevailing wind often works better than a tightly closed barn, because closed barns can trap moisture and ammonia, which affects lungs. Dense tree rows, hay bale walls and solid fence panels can also cut wind.
Deep, dry bedding lets animals insulate themselves from cold ground. Add fresh bedding on top as it gets damp, and keep wet spots from forming near doors and water. Animals standing in frozen mud lose heat through their feet and legs.
- Block wind first, then keep the floor dry
- Provide enough space so every animal can lie down at once
- Keep bedding clean and refreshed
- Check shelters for drafts at animal height
How does feed change in cold weather?
Animals generate body heat by digesting fiber, so good quality hay or forage is the main fuel for staying warm. When the weather turns cold, they need more feed, not less, and long stretches of cold may mean you must increase what you give. Ask your extension office or vet for a feeding plan for your species and body condition, since the right amount depends on the animal.
Watch body condition by feel and by sight, not only by looking at a thick coat. A heavy coat can hide a thin animal. Run your hands over ribs and backs weekly, and note any animal that is losing weight.
Take notes at the end of every cold snap on what worked and what did not: which corner stayed dry, which animals lost condition, which trough froze first. Those notes make next winter easier and cost nothing.
How do you keep water from freezing?
Animals that cannot find liquid water eat less and are at risk of digestive trouble. Check water at least once daily in freezing weather, break ice, and consider insulated or heated troughs. Any heated trough or cord needs safe, grounded wiring and a rated outdoor setup, and electrical work should be done by a licensed electrician.
Stock tanks placed in a sunny, wind-sheltered spot freeze more slowly. Keep paths to water clear of ice so animals do not slip.
Never use open flames or improvised heaters in barns, since fire is a larger risk in dry bedding and hay. Heat lamps in particular have started many barn fires, so ask your fire department or extension office about safer approaches.
What are the warning signs of cold stress?
Signs include shivering, hunched posture, standing apart, reluctance to move, weakness, a drop in appetite, and cold ears or limbs. Newborns that are chilled may be limp and slow to nurse. In poultry, watch for frostbite on combs and wattles and for birds fluffed up and not eating.
Severe cold stress is an emergency. If an animal is down, will not eat, or seems unresponsive, call your veterinarian right away. Do not attempt to warm a very cold animal quickly using improvised methods unless your vet tells you how, because the wrong approach can make things worse.
Poultry need dry, draft-free housing with good ventilation above roost height, because damp air causes frostbite and respiratory trouble even when the temperature is mild. Closing a coop tight to keep it warm often backfires.
What should you do before winter?
Walk the farm in fall and fix gaps in windbreaks, repair roof leaks, order bedding and stock hay early, and test your water setup. Keep your vet's number handy and have a plan for who covers chores during a storm.
Costs fall into categories: extra hay and bedding, windbreak materials, heated water equipment and electrical work, and vet consultation. Hay is usually the largest category, so check your supply against the length of winter in your region.
Key takeaways
- Wind, wet coats and mud do more harm than low temperature alone.
- Provide a dry windbreak and clean bedding.
- Feed more good hay in cold spells and check body condition by touch.
- Keep water open and have electrical work done by a professional.
- Down or unresponsive animals need a vet right away.
Sources and further reading
Last reviewed: November 12, 2026. Written by the Homestead & Small Farm Editorial Team. See our editorial policy.