How to Winterize Your Outdoor Faucets and Plumbing in Ontario

A burst outdoor pipe is one of the most preventable — and most destructive — home emergencies in Ontario. When water trapped in an outdoor faucet or supply line freezes, it expands and can split the pipe, sending water flooding into your wall or basement the moment it thaws. The fix takes twenty minutes in the fall and costs nothing; the damage from skipping it can run into thousands. Here's exactly how to winterize your outdoor plumbing before the first hard freeze in Kitchener-Waterloo.

Why Outdoor Pipes Burst

Water expands by roughly 9% when it freezes. When water is trapped in an outdoor faucet (hose bib) or the supply line feeding it, that expansion has nowhere to go and exerts enormous pressure on the pipe walls. The pipe can split — often at a point hidden inside the wall. Counterintuitively, the flooding usually happens not when it freezes, but when it thaws: the split pipe holds back the ice, then releases a torrent of water once it melts. In an Ontario winter, even one hard November freeze on an undrained faucet is enough to cause this.

Step 1: Disconnect and Drain Garden Hoses

This is the single most important step and the one most often skipped. A hose left attached to an outdoor faucet traps water in both the hose and the faucet. Even a "frost-free" faucet cannot drain properly with a hose connected, defeating its design. Disconnect every hose, drain it completely, and store it indoors for the winter — a drained hose lasts far longer too. Do this before the first freeze, not after.

Step 2: Shut Off the Interior Supply Valve

Most homes have an interior shut-off valve on the supply line that feeds each outdoor faucet — usually in the basement or a crawl space near where the line exits the wall. Close that valve to stop water from reaching the outdoor faucet. Then open the outdoor faucet and leave it open for the winter, which relieves pressure and lets any remaining water escape rather than freezing in a closed line.

Step 3: Drain the Remaining Water

After closing the interior valve and opening the outdoor faucet, there's often a small bleeder cap or drain on the interior shut-off valve. Place a bucket beneath it and open it to let the water trapped between the valve and the outdoor faucet drain out. Emptying this section is what truly protects the line. Leave the bleeder cap loose or open through the winter.

Frost-Free Faucets and Insulated Covers

Many newer Ontario homes have frost-free (frost-proof) hose bibs, which place the shut-off valve deep inside the heated wall so the exposed portion drains automatically — but only if the hose is disconnected and the faucet is pitched correctly to drain. Even with frost-free faucets, disconnecting hoses is essential. For added protection on any outdoor faucet, install an inexpensive foam insulated faucet cover, which costs a few dollars and adds a meaningful margin of safety during extreme cold.

Signs a Pipe Has Already Frozen

If you skipped winterizing or a cold snap arrives early, knowing the warning signs of a frozen pipe lets you act before it bursts. The clearest signal is no water, or only a trickle, from a faucet during cold weather — if you turn on a tap and almost nothing comes out, suspect a frozen section upstream. Other clues include frost or condensation visible on an exposed pipe, a bulging or distorted pipe, and unusual smells from a drain caused by a blockage.

If you suspect a frozen pipe, shut off the main water supply immediately, then open the affected faucet so water can escape as the ice melts. Apply gentle heat to the frozen section with a hair dryer or a space heater kept at a safe distance — never an open flame, which is a fire hazard and can damage the pipe. Work from the faucet end toward the frozen area. If you can't locate or safely thaw the pipe, or if a pipe has already split, call a plumber right away; catching it early can mean the difference between a quick thaw and a flooded basement.

Extra Steps If You Travel for the Winter

Snowbirds and anyone leaving a home empty during an Ontario winter face a higher risk, because a frozen, burst pipe in an unoccupied house can flood undetected for days or weeks. If you'll be away, never let the home drop below about 13–15°C, even when no one is there — the heating savings aren't worth a catastrophic water loss. Shut off the main water supply and drain the lines if the house will sit empty for an extended period. Have a trusted neighbour, friend, or property manager check the home regularly, and consider a smart thermostat with low-temperature alerts and a water-leak sensor that notifies your phone. These precautions cost little and prevent the kind of damage that can run into the tens of thousands.

Don't Forget the Rest of Your Outdoor Plumbing

Outdoor faucets aren't the only vulnerable points. Round out your winterizing with these:

• Sprinkler/irrigation systems: drain or blow out the lines before freeze — trapped water in underground irrigation can crack pipes and heads.
• Pool and pond lines: follow the manufacturer's winterizing process.
• Exposed pipes in unheated spaces: insulate pipes in garages, crawl spaces, and against exterior walls; consider heat tape for chronically cold runs.
• Interior pipes on exterior walls: during extreme cold, let a faucet drip and open cabinet doors under sinks on outside walls to keep warm air circulating.

Twenty minutes of fall preparation prevents the most common winter plumbing disaster. For Kitchener-Waterloo homeowners, it's one of the easiest and highest-value winterizing tasks there is.