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Blanket Guide · Wet Weather

How to Keep Your Horse Dry When the Weather Turns

Cold and wet is a different problem than cold alone. Here's what actually happens to a soaked horse — and how to stop it.

Blanket Center · Tack of the Day
The Real Risk

Rain Changes the Equation

A dry horse in 35°F weather is dealing with cold. A wet horse in 45°F weather is dealing with something closer to hypothermia. That's not an exaggeration — it's physics.

A horse's coat works like a down jacket: thousands of tiny air pockets trap body heat between the hairs. When that coat is soaked through, those air pockets collapse and the insulation is gone. Then, as the horse begins to dry, evaporation pulls even more heat away from the skin — the same way sweat cools a horse after work. On a windy, wet afternoon, a horse can lose body heat faster than it can produce it.

The downstream effects are real: horses in prolonged wet conditions burn extra calories just to stay warm, which shows up as weight loss over a season. And extended moisture against the skin creates the perfect environment for rain rot, mud fever, and thrush.

🌧️
Wet coat = lost insulation
Once water saturates the coat, the natural air-trap that keeps a horse warm is gone. Wind makes it dramatically worse — even a light breeze strips heat from a wet coat far faster than still air at the same temperature.
Decision Guide

When Rain Means It's Time to Blanket

The short version: in wet conditions, pull the trigger on blanketing earlier than you normally would. A temperature that would be comfortable for a dry horse with a full coat becomes a concern when it's raining.

Four situations that call for protection:

🌨️
Rain + Cold Together
Any wet weather that combines with temperatures where you'd normally start thinking about blanketing. When the coat can't insulate, the temperature threshold moves up — plan for the forecast, not the current reading.
⏱️
Rain That Won't Stop
A brief shower a horse can shake off. Half a day of steady rain is a different problem. Extended wetness drains energy, opens the door to rain rot, and doesn't allow the skin to recover between events.
💨
Wind + Wet
Wind cancels out shelter. A horse standing in a run-in shed with wind-driven rain gets minimal protection without a blanket. Wind also increases spookiness and accident risk — a blanket helps on both fronts.
🐴
Senior or Vulnerable Horses
Older horses, underweight horses, and thin-skinned breeds like Thoroughbreds and Arabians have less natural insulation and a harder time maintaining body weight. They need protection earlier and more consistently.
Temperature Reference

In dry conditions, these are the points where most horses need blanketing. In rain, move up to the higher end of each range:

Horse Type Dry Weather Wet Weather
Senior, underweight, or sick Below 50°F Below 55°FStart earlier, stay consistent
Clipped horse Below 60°F Below 65°FNo coat = no buffer
Moderate coat, healthy adult Below 40°F Below 45°FWet coat loses insulation fast
Heavy winter coat, hardy breed Below 30°F Below 35°FEven thick coats saturate
Gear Selection

What to Look for in a Rain Blanket

Not all turnout blankets handle wet weather equally. Two properties matter most — and they have to work together.

  • ✓
    Waterproof outer shell The outer layer needs a waterproof rating (measured in millimeters) high enough to resist sustained rain, not just a quick shower. Look for 1200mm+ for genuine wet-weather protection; quality turnouts often rate 1800mm or higher. Lower ratings are fine for light dew or frost.
  • ✓
    Breathable membrane This is what separates a good rain blanket from a horse-shaped sauna. The blanket needs to block water coming in while letting moisture vapor (sweat) escape. A non-breathable waterproof blanket can overheat a horse on a cool rainy day just as much as no blanket at all.
  • ✓
    Correct fill weight for the temperature A rain sheet with no fill is fine for cool fall weather above 40°F. When rain comes with real cold, you need fill weight — 150–250g for moderate cold, 300g+ for freezing temperatures. The waterproofing and the fill are two separate decisions.
  • ✓
    Neck cover for extra exposure A horse's neck and withers area loses significant heat in sustained rain. A detachable or integrated neck cover adds meaningful protection in serious wet weather — especially valuable for seniors and clipped horses.
  • ✓
    Proper fit — no gaps at the chest or neck A blanket that gapes at the chest or sits loose at the neck turns into a funnel for rain. Conversely, a blanket that's too tight restricts movement and creates pressure sores. Look for good shoulder and wither clearance with a secure but comfortable closure at the chest.
The Rule Everyone Breaks
Never put a blanket on a wet horse.
If your horse came in soaked, dry them off first — even if it's cold and you're in a hurry. Blanketing over a wet coat traps the moisture against the skin, which is the worst of both worlds: no insulation benefit, and a warm, dark, wet environment that breeds skin infections. Dry with towels, a cooler, or a hot walker first. Then blanket.
Blanket Care

Keeping Your Blankets Actually Waterproof

A turnout blanket that's lost its waterproofing is just a heavy wet rag. The outer shell is treated with a DWR (durable water repellent) coating that wears down over time — faster with heavy use, washing, and UV exposure. The good news is it's completely fixable.

How to tell when it's time to reproof
1
The blanket gets heavy in the rain
A properly treated blanket sheds water at the surface; the fabric stays light. When it starts absorbing instead of repelling, the DWR is gone.
2
The inside is damp after a wet day
Condensation from breathing is normal. Actual wetness that soaked through the shell is not — that means the outer layer has failed.
3
The water test
Lay the blanket flat and pour a cup of water on the outer shell. The water should bead up and hold for several minutes. If it soaks in within 30 seconds, it needs reproofing.
Two ways to reproof
💦 Spray-On Method
  • Clean blanket thoroughly, let dry
  • Work outdoors or in a ventilated space
  • Spray evenly across the entire outer surface
  • Let dry 24 hours; apply a second coat
  • Do the water test — repeat if needed
🧺 Wash-In Method
  • Clean blanket first; remove all dirt
  • Use a specialty wash-in DWR product
  • Machine wash on warm/synthetic cycle, or hand-apply
  • Air-dry completely — never machine-dry
  • Heat from a dryer destroys the waterproof membrane
⚠️
Never machine-dry a waterproof blanket
Heat destroys the waterproof membrane — the same one that keeps your horse dry. Even a single tumble-dry cycle on hot can permanently compromise a blanket that cost hundreds of dollars. Always hang-dry, indoors or out.
Before Wet Weather Hits

Your Wet-Weather Readiness Checklist

  • ✓
    Do the water test on all turnout blankets now Don't wait until a rainy night to discover the waterproofing is gone. Sprinkle some water on the shell — it should bead. If not, reproof before the season starts.
  • ✓
    Have a spare blanket ready If your horse comes in soaked, you need a dry one ready to go after you've dried them off. Rotating between two blankets through a wet week is much easier than fighting a damp one.
  • ✓
    Check blanket fit — especially at chest and withers Fit changes as horses gain or lose condition through the season. A gap at the chest or shoulder is a rain funnel.
  • ✓
    Know your horse's wet-weather threshold Older horses, recently clipped horses, and thin-skinned breeds all have an earlier trigger point. Adjust your habit now, not when you're watching them shiver at the fence.
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