The single most common winter plumbing failure is a garden hose left attached to an outdoor faucet. Even frost-free sillcocks fail when a hose holds water against the valve seat. Water freezes back into the pipe behind the wall, splits the pipe, and the leak doesn't appear until spring when someone turns the faucet back on and discovers water spraying inside the wall. The whole problem is preventable in 5 minutes of fall maintenance. The check below also catches frost-free sillcocks that aren't draining properly — a real failure mode that doesn't show up until the winter that breaks the pipe.

Quick check (yearly, before first freeze)

  1. Disconnect every garden hose from every outdoor faucet. Drain hoses, store somewhere protected.
  2. Identify each faucet's type: frost-free sillcock (longer body, valve is inside the wall) or traditional outdoor spigot (valve is right at the faucet).
  3. For frost-free: turn the faucet on, then off. Water should stop after a second or two as the internal valve closes and remaining water drains forward through the spigot.
  4. For traditional spigot: locate the indoor shutoff valve (usually in the basement or crawl space, on the supply line near where it exits the wall). Close it. Then open the outdoor spigot to let water drain.
  5. Check that water stops fully. Slow drips after shutoff mean the valve isn't sealing — repair or replace before freezing weather.
  6. Cover faucets with insulated covers (foam covers, $3 to $10 each) for extra protection in cold climates.

What's the difference between frost-free and traditional

  • Frost-free sillcock (also called frost-proof): longer body (6 to 12+ inches). The actual shutoff valve is inside the warm house wall. When you close the faucet, the valve seals deep inside the wall and water in the long body drains out through the spigot. Standard in most new construction.
  • Traditional outdoor spigot: the valve is right at the spigot. Water sits in the pipe between the spigot and the indoor shutoff. Common in older homes.

Frost-free sillcocks don't need an indoor shutoff valve in normal use. Traditional spigots almost always have one, and it has to be used for winterization.

Signs the frost-free sillcock isn't draining

  • Water continues to drip from the spigot for more than a few seconds after shutoff.
  • Water sprays from the handle area when you turn the spigot on (cracked tube inside).
  • The faucet has been installed at the wrong angle (should pitch down slightly toward the outside so water drains; level or back-pitch traps water).
  • The interior valve washer has worn out.
  • Damage from a hose that froze and split the tube last winter.

If you see any of these, get the faucet repaired or replaced before freezing weather. A frost-free that doesn't drain is no safer than a traditional spigot.

Why a hose attached over winter is so bad

Even on a frost-free sillcock, a hose connected to the spigot does two things:

  • Traps water in the long faucet body that should have drained out.
  • Holds water against the valve seat, preventing the internal drain from working.

When that trapped water freezes, ice expands and forces water back through the valve seat into the pipe inside the wall. The pipe splits. In spring, when someone opens the faucet, water pressure pushes through the split and floods the wall interior.

This is the #1 most preventable freeze-failure cause in plumbing.

Winterizing a traditional outdoor spigot

  1. Find the indoor shutoff valve. Usually inside the basement, crawl space, or utility room on the supply line going to the outdoor spigot.
  2. Close the indoor valve fully (clockwise).
  3. Go outside and open the outdoor spigot fully.
  4. Water should drain out through the spigot. May take a minute or two if the pipe was full.
  5. Leave the outdoor spigot open through winter (some experts recommend; others say close it after draining — check local practice).
  6. If the indoor valve has a small drain cap (bleeder cap), open it to drain water from the section between the valve and the outdoor spigot.
  7. Catch the small amount of water that drains from the bleeder in a bucket.

If you don't know if you have an interior shutoff

For traditional spigots, the interior shutoff should always exist somewhere. Look on the supply line, usually a few feet inside the wall from where the spigot exits. If you can't find it, a plumber can install one — important enough that it's worth the cost in freezing climates.

For frost-free sillcocks, there's often no interior shutoff because the design doesn't need one. The frost-free unit handles drainage internally.

Insulated faucet covers

Foam covers that fit over outdoor faucets cost $3 to $10 each and add an extra layer of protection. They don't replace proper winterization but they help, especially:

  • In climates with brief but severe cold snaps.
  • For frost-free sillcocks where the wall isn't well-insulated.
  • As insurance against forgotten hoses or faucets that didn't drain perfectly.

Install in fall, remove in spring.

If the pipe already burst

Common signs in spring:

  • Water spraying from inside the wall when you turn on the outdoor faucet for the first time of the season.
  • Water dripping from a basement or crawl space ceiling below the faucet.
  • Wet patches on interior walls near the faucet.
  • Reduced flow from the faucet but pressure normal elsewhere.
  • Sounds of water running when no faucet is on.

Shut off water immediately (interior shutoff if you can find it; main shutoff if not). Call a plumber. Document with photos for insurance. See how to check your main water shutoff valve.

Common mistakes

  • Leaving a hose attached over winter. The single biggest cause of split pipes.
  • Assuming "frost-free" means "indestructible." It's not.
  • Closing the interior shutoff but forgetting to open the outdoor spigot to drain.
  • Not testing the drain in fall. A faucet that doesn't drain looks the same as one that does.
  • Removing insulated covers too early in spring during a late freeze.
  • Not knowing where the interior shutoff is for traditional spigots.

If you live somewhere without freezing winters

Frost-free protection isn't a concern, but the faucet still benefits from yearly maintenance:

  • Disconnect hoses periodically to prevent washer wear at the spigot.
  • Replace washers if drips appear.
  • Inspect for corrosion, especially in coastal salt air.
  • If you have a freeze warning that's unusual for your area, take 5 minutes to disconnect hoses and cover spigots.

Good maintenance rhythm

  • Yearly in fall before first freeze: disconnect every garden hose, test that faucets drain, cover with foam covers in cold climates.
  • Quarterly: walk the exterior and confirm no hoses are still attached.
  • Yearly in spring: remove covers, inspect for damage from winter, replace any failed faucets before regular use.
  • If frost-free doesn't drain: repair or replace before next freeze.
  • Document the locations of interior shutoffs so you can find them in an emergency.
  • In unexpected freeze warnings (in normally mild climates): disconnect hoses and cover spigots.
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