Let the winter coat do the job it grew for
A healthy foal meets his first cold season with equipment of his own: a thick winter coat that traps air against the skin and flattens or fluffs with the weather. Your first preparation is simply not to sabotage it — skip the urge to stable him in a warm barn around the clock, because a foal who lives in artificial warmth grows less coat and feels the cold more sharply when he does go out. Regular outdoor time through the season hardens him gradually, and ordinary grooming keeps the coat lofting properly; a coat caked flat with mud insulates badly, so a brush-off on dry days is genuine winter care, not cosmetics. He will tell you when he is cold — persistent shivering is the sign to act on.
Blankets are the exception, not the uniform
Most foals do not need a rug, and a badly managed one does more harm than the weather: a foal grows so fast that a blanket fitting in early winter can rub and restrict by mid-season. Consider one only for a foal who is underweight, unwell, clipped for a procedure, or standing wet in wind that strips heat faster than his coat can hold it — a run-in shelter solves that last case better. If you do rug, choose a foal-sized fit, check under it daily for rubs and for the condition hiding beneath, remove it on mild dry days, and re-check the fit every couple of weeks against his growth.
Fuel the furnace with forage
Cold weather raises a foal's energy needs, and forage is the safest fuel: digestion of hay generates internal heat, so increase hay ahead of a cold snap rather than after it, and make sure the youngest in a group is actually getting his share when older horses guard the pile. Spread hay in more piles than there are horses so he can always find an unguarded one. Watch his condition through the coat with your hands weekly — winter hair hides weight loss beautifully, and ribs that were merely feelable in autumn should not become prominent by mid-winter without the ration being reviewed. A balancer or youngster feed keeps the minerals right while the hay does the warming.
Water, mud and hooves through the cold months
The winter risk owners underestimate is water: a foal who finds his trough iced or near-freezing drinks less, eats less, and risks impaction trouble, so break ice at least twice daily and consider a trough heater where your setup allows one safely. Manage the mud at gates and troughs with hardcore or mats before it becomes the deep, freezing kind that pulls at small legs and soaks the cold into them as they stand in it. Keep the farrier's visits on schedule through winter — overgrown hooves slip worse on frozen ruts — and check legs for mud fever where wet conditions persist, drying legs before he stands in for the night.
First-winter care is a rhythm of small repeated jobs, and KinsLe Care Teams lets you assign the ice-breaking, hay top-ups and hands-on condition checks for the foal and tick each one off with a timestamp.