CityvettedWinterizing your pipes before the first freeze
What you can do yourself, what is worth a plumber, and the small jobs that prevent a burst-pipe disaster.
A frozen pipe does not announce itself. It freezes overnight when the temperature drops, and the damage often shows up the next afternoon when the ice thaws and the crack it left behind starts spilling water into your wall. By then you are looking at a flooded room and a five-figure cleanup, all from a job that costs almost nothing to do right before the cold sets in. Winterizing your pipes is the rare home task where an hour of attention in October prevents a disaster in January.
The good news is that most of it you can do yourself, and the parts worth hiring out are clearly defined. We pulled together what plumbers actually recommend, separated the high-value steps from the busywork, and added the signs that mean you should call a pro before the first hard freeze.
- The pipes that freeze are the ones in unheated space: crawl spaces, attics, garages, and exterior walls.
- Disconnecting garden hoses is the single cheapest, highest-impact step. Do it first.
- Foam pipe sleeves cost a few dollars and stop most freezes in accessible runs.
- Know where your main shutoff is before you need it. In an emergency, seconds of water matter.
Where pipes actually freeze
Pipes inside heated, insulated living space almost never freeze. The danger zones are the unheated edges of your house: the crawl space under the floor, the attic, an unheated garage, and any pipe that runs through an exterior wall. Water expands as it freezes, and the pressure it builds is enormous, enough to split copper or burst PEX. The crack itself is usually small, which is why the leak waits until the thaw to reveal itself.
The most common failure point is the most obvious one: an outdoor faucet, called a hose bib, with a garden hose still attached. The hose traps water against the faucet and the short pipe behind it, and that trapped water freezes and backs pressure up into the wall. Disconnecting and draining your hoses takes five minutes and prevents one of the most frequent winter floods we hear about.
Cityvetted analysis, 2026.
The work, in order
- Disconnect every hose.
Drain it, coil it, store it. Then drain the bib itself if you have an interior shutoff for it.
- Insulate exposed pipes.
Slip foam sleeves over any run in the crawl space, garage, or attic. Tape the seams.
- Seal the cold air out.
Caulk gaps where pipes pass through exterior walls. A draft on a pipe is what freezes it.
- Locate your main shutoff.
Find it, label it, and make sure everyone in the house can reach it in the dark.
When to call a plumber
Most winterizing is a homeowner job, but a few situations call for a pro. If you have a sprinkler or irrigation system, get it professionally blown out with compressed air. The buried lines hold water that will freeze and crack the heads, and the equipment to clear them properly is not something you own. If you leave a vacation home or cabin unheated over winter, a plumber should drain the entire system and add antifreeze to the traps. And if you have had a pipe freeze before, ask a plumber whether heat tape or rerouting the vulnerable run is worth it.
"People insulate the pipes they can see and forget the draft blowing on them. Stop the cold air first, then worry about the foam."
to Priya Anand, Deputy EditorIf a pipe freezes anyway
If a faucet runs to a trickle on a cold morning, you likely have a partial freeze, and you have a chance to act. Open the faucet so melting water can escape, and warm the suspected section gently with a hair dryer or a space heater kept at a safe distance. Never use an open flame. If a pipe has already burst, shut off the main immediately, which is exactly why you found and labeled it in step four.
The bottom line
Winterizing pipes is the cheapest catastrophe insurance in homeownership. An afternoon of hoses, foam, and caulk, plus knowing where your shutoff is, defends against a flood that can cost more than your roof. Do the easy parts yourself, hire out the irrigation blowout and the cabin drain-down, and go into the first freeze without that one nagging worry.
Cityvetted's plumbing rankings favor pros who educate homeowners on the DIY steps rather than upselling them, and who handle the genuinely technical jobs like irrigation blowouts cleanly. Honesty about what you can do yourself is a signal we reward.