How to Help Stray Cats in Winter: Cold, Shelter and Safety

A cat’s normal body temperature is about 38 to 39°C (100 to 102°F), and fur insulates well as long as it stays dry. Wet fur loses that advantage, which is why sleet, melting snow and damp bedding can be harder on a cat than a dry, still frost. Cat welfare advice suggests that below about 7°C (around 45°F), long periods outdoors can start to be unsafe.

Some cats feel the cold far more than others. Kittens, elderly cats, sick or thin cats and cats with arthritis lose heat faster and have less energy to spare, and cats with heart disease or diabetes are more prone to frostbite. If you look after a group, these are the cats to check first on a cold evening.

Hypothermia means the body is losing heat faster than it can make it. At first a cat shivers to warm itself. As it cools further it grows slow and confused, its breathing and heart rate fall, and the shivering may stop. That last change can look like recovery when it is really a sign of decline; untreated, hypothermia can be life-threatening.

Frostbite strikes the parts furthest from the heart: ear tips, paws and tail tip. The skin may look pale or grey at first, then turn red and swollen as it thaws, and blisters or darkened skin can follow. These signs can take several days to show, so a cat that seemed fine on the night of a freeze may still need checking later in the week.

Both conditions need a vet even if the cat perks up once warm, because a low temperature can also point to other serious illness. A frightened cat in pain may bite or scratch, so read how to approach strays safely first, and use a carrier or sturdy box.

To a cat on a freezing night, the space around a recently driven engine looks like the warmest shelter in the street, so a few seconds of looking and tapping can save a life. For the same reason, glance into sheds and garages before you shut them; a cat that slipped in to escape the cold can be locked in for days.

Antifreeze is so dangerous because it tastes appealing and only a little is needed to damage the kidneys for good. The same poison can be found in screen wash, brake fluid and radiator fluid, and even rainwater collected in an old antifreeze container can harm a cat. Clean up spills thoroughly, keep containers sealed, and consider products made with propylene glycol, which is much less toxic.

De-icing salt and chemical ice melts do quieter harm. Cats lick them off their paws or drink from melting puddles, and the chemicals can sting their pads. Keep them well away from feeding spots and shelters, and choose pet-friendly ice melts where you can.

Thin bowls with a wide surface open to the wind freeze first. A deep container of thick plastic holds its warmth longer than thin plastic or ceramic, and a sunny position buys a few more hours. Rubber containers have the advantage of not cracking when the water inside freezes. Where power is available, a heated or solar-heated bowl keeps both water and wet food from turning to ice.

Keep the water outside the shelter, though. One tipped bowl can soak the bedding, and a wet bed is colder than none. A small roofed feeding station raised off the ground shields bowls from wind and snow.

Wet food takes the least energy to digest, leaving more for warmth, but it can freeze solid overnight, so serve it fresh and clear away the rest. In a well-insulated shelter, food can go inside, well away from the doorway, where the cats’ own body heat helps keep it soft. Before a storm or cold snap, leave extra food and water in case you cannot get there for a day or two.

A shelter stays warm only if the cats’ body heat can fill it, so small beats large. The basic build, size and door width are in caring for community animals responsibly; what follows keeps that shelter working through a hard winter.

Bedding. Straw repels moisture and lets cats burrow in. Pack it loosely until the shelter is a quarter to half full, top it up before storms, and replace it once it is damp or dirty. Hay looks similar but soaks up water and can go moldy. Blankets and towels draw heat away from a cat lying on them and can freeze.

Insulation. Where it is very cold, or where you cannot check often, lining the inside walls and floor with a reflective foil sheet, like the material of an emergency blanket, helps hold body heat in.

Entrances. Turn the doorway away from the wind or toward a wall. Some groups suggest two entrances, so a cat cannot be trapped inside, set so they are not directly opposite each other, which would make a draft. A simple flap helps keep out snow and rain.

Placement. Raise the shelter on a pallet or bricks, cover it with a tarp while leaving the doors open, and weigh it down against storms. Pick a quiet, familiar, hidden spot out of dogs’ reach, and set it out before the worst weather, because cats can take a while to trust it.

A mother cat often leaves her litter for a few hours, and warm kittens in a sheltered spot can manage that. Kittens that are cold or wet cannot wait: they need to be taken in and warmed now, and a cold kitten should never be fed until it is warm again. See what to do if you find kittens.

Older, arthritic, thin or unwell cats have less energy to spare, so act early if one stops coming to eat or looks hunched and slow. And if a group is due for neutering in winter, traps are never left unattended in the cold, trapped cats go straight into a heated vehicle or building, and they are returned only to a warm, dry shelter. Done this way, winter neutering also means fewer kittens are born in spring; see what TNR is and how it works.

Call a vet now for any of the danger signs above, for possible antifreeze contact, or for a cat that is injured, cannot walk properly or has stopped eating. Phone ahead if you can.

A friendly, tame cat that turns up in winter may be lost rather than homeless. A vet can scan it for a microchip, and keeping it warm while you look for its owner is a kindness. The I found an animal helper walks you through the next steps.

A healthy feral cat, one that fears people and cannot be handled, is usually better off outdoors with good shelter, food and water than shut indoors, where it would be very stressed.