How to Winterize Outdoor Taps and Prevent Frozen Pipes

When temperatures drop, the water sitting in outdoor taps and supply lines can freeze, expand, and burst pipes—often causing damage that isn't discovered until spring. A little preparation in autumn costs almost nothing and can save you thousands in repairs. Here's how to protect your outdoor plumbing before the first hard freeze arrives.

Why Outdoor Taps Are Vulnerable

Outdoor taps (also called hose bibbs or spigots) are usually the most exposed plumbing in your home. The supply pipe often runs through an uninsulated exterior wall or unheated space, and any water left trapped inside can turn to ice. When water freezes, it expands by roughly a tenth of its volume, and the pressure builds along the pipe—not necessarily where the ice forms. That's why a pipe can split in a basement or wall cavity even though the tap itself looks fine. Metal pipes can split cleanly; plastic pipes may crack or shatter. Either way, the first thaw turns the damage into a leak.

Shut Off and Drain Your Outdoor Taps

The core of winterizing is simple: remove the water, then protect what you can't drain.

  1. Locate the indoor shut-off valve that feeds the outdoor tap. In many homes it's in the basement, crawlspace, or utility area, often with a small bleed cap or a lever.
  2. Close the valve firmly, then go outside and open the tap to let remaining water drain out.
  3. Leave the outdoor tap slightly open over the winter so any residual water or seepage can escape instead of pooling.
  4. If your shut-off valve has a bleed cap, open it (with a bucket underneath) to drain the section of pipe between the valve and the tap.
  5. Disconnect and drain garden hoses, then coil and store them indoors. A hose left attached traps water in the tap and prevents proper drainage.

If you can't find an indoor shut-off valve, don't panic—insulating the tap well (see below) still offers meaningful protection, though draining is always the more reliable option.

Insulate Taps and Exposed Pipes

Once everything is drained, add insulation as a second line of defense.

  • Fit a foam tap cover or insulated pouch over each outdoor tap. These inexpensive covers slip on in seconds and are reusable year after year.
  • Wrap any exposed supply pipes in unheated areas—garages, crawlspaces, exterior walls—with foam pipe insulation sleeves, securing the seams with tape.
  • Seal gaps where pipes enter the house. Caulk or expanding foam around penetrations keeps cold air from blowing directly onto the pipe.
  • For frost-free (sillcock) taps, which have a long stem designed to shut off inside the warm wall, the key is still removing hoses and ensuring the tap slopes slightly downward so it drains fully.

Protect Indoor Pipes in Cold Snaps

During a Deep Freeze

Even well-winterized homes can be caught out by an unusually severe cold spell. When the forecast turns bitter, take a few extra precautions: open cabinet doors under sinks on exterior walls so warm room air can circulate around the plumbing, and let a pencil-thin trickle of cold water run from the farthest tap—moving water is far harder to freeze. Keep the thermostat set consistently, day and night, especially if you're away; a brief drop in heating is all it takes. Know in advance where your main water shut-off valve is, so you can act quickly if a pipe does burst.

What to Do If a Pipe Freezes Anyway

If you turn on a tap and only a trickle comes out, assume a freeze. Shut off the water at the affected valve or the main, then gently warm the frozen section using a hairdryer, heat gun on low, or towels soaked in warm water—starting from the tap end and working back. Never use an open flame or boiling water, and never leave a space heater unattended near the pipe. If you can't locate the frozen section, the pipe is inaccessible, or you see any bulging or cracking, call a licensed plumber rather than risking a burst.

A Small Job With a Big Payoff

Winterizing your outdoor taps takes less than an hour with basic supplies, and doing it every autumn becomes second nature. Drain, insulate, and stay alert during cold snaps, and your plumbing will greet spring exactly as it left autumn: intact and leak-free.

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