Winterizing Your Home: The Complete Checklist

Winter damage is almost entirely preventable, and almost entirely predictable. Frozen pipes, ice dams, and heating failures cost homeowners billions every year — and the overwhelming majority of it traces back to a handful of tasks nobody got around to before the freeze. The best part: most of those tasks cost $0. They're not repairs; they're an hour of draining, sealing, and testing.

This is the deep-cold checklist. If you've already done fall maintenance, this layers on the specific defenses for hard freezes — pipe protection, ice-dam prevention, and an emergency plan for when the power or heat goes out. Work through it by area before the first sustained cold snap.

Plumbing & pipe protection

This is the section that saves you the most money. A burst pipe can release hundreds of gallons and cause tens of thousands in damage. Everything here is about keeping water out of the cold and knowing how to stop it fast.

• Drain and shut off all outdoor faucets and hose bibs — DIY. Disconnect hoses, close interior shutoffs, and open the bib to drain. This is the single most-skipped, most-costly miss.
• Insulate pipes in unheated areas — DIY. Foam sleeves on pipes in the crawlspace, garage, attic, and along exterior walls. A few dollars each.
• Seal air leaks near pipes — DIY. Cold air blowing through a rim-joist gap onto a pipe is how interior pipes freeze. Caulk and foam those gaps.
• Know where your main shutoff is — and that it works — DIY. In a burst, you have seconds. If a pipe does freeze, our frozen pipes guide covers safe thawing, and the burst pipe guide covers the first ten minutes.
• Let faucets drip during extreme cold — DIY. A trickle on exterior-wall fixtures relieves the pressure that actually bursts pipes.
• Open cabinet doors under sinks on cold nights — DIY. Lets warm room air reach the pipes.
• Winterize the irrigation system — Pro (or DIY with a compressor). Blow out the lines so buried pipes don't crack.

Roof, gutters & ice dams

Ice dams form when heat escapes into the attic, melts the underside of snow, and the meltwater refreezes at the cold eaves — backing water up under the shingles and into your ceilings. You prevent them from the inside.

• Clean the gutters before the freeze — DIY. Clogged gutters trap water that freezes and worsens ice dams. See our gutter cleaning guide for doing it safely.
• Add attic insulation and seal air leaks — DIY. Keeping heat out of the attic keeps the roof deck cold, which is what stops dams from forming. This is the real fix.
• Check attic ventilation — DIY. Good soffit-to-ridge airflow keeps the deck cold and even.
• Inspect and repair the roof before winter — Pro. Fix loose shingles and flashing now. A small roof repair in fall beats an ice-dam leak in January.
• Have a roof rake ready for heavy snow — DIY. Pulling snow off the lower roof after big storms reduces dam risk. Never climb onto a snowy roof.

HVAC & heating

A heating failure in a deep freeze is both a comfort problem and a pipe problem — a cold house freezes pipes.

• Replace the furnace filter — DIY. Clean filter, better airflow, less strain.
• Book a furnace tune-up if you haven't — Pro. A technician checks the heat exchanger, igniter, and gas pressure. It prevents the mid-winter no-heat call, and a failed system means a furnace replacement at $3,800–$12,000. Our HVAC maintenance guide covers the details.
• Test carbon monoxide detectors — DIY. Sealed-up, heating-season homes are prime CO territory. Replace batteries and old units.
• Have the chimney swept — Pro. If you burn wood, creosote is a fire hazard. Sweep and inspect before the first fire.
• Reverse ceiling fans to clockwise, low speed — DIY. Pushes warm air down.
• Set the thermostat no lower than 55°F when away — DIY. Going colder to save money risks freezing pipes. Never fully shut the heat off in freezing weather.

Exterior & foundation

• Seal gaps, cracks, and penetrations — DIY. Caulk around windows, doors, and where wires and pipes enter. Keeps heat in and cold air off your pipes.
• Replace worn weatherstripping — DIY. No draft should get through a closed door.
• Drain and store outdoor equipment — DIY. Fountains, pool lines, and garden tools.
• Stock salt, sand, and a sturdy shovel — DIY. Buy before the first storm sells them out.
• Check that soil grades away from the foundation — DIY. Prevents meltwater from pooling and heaving against the foundation.

Interior & emergency prep

• Locate and label all shutoffs — DIY. Water, gas, and the electrical panel. Everyone in the house should know them.
• Build a power-outage kit — DIY. Flashlights, batteries, water, blankets, a battery or crank radio, and a way to charge phones.
• Reverse-check the sump pump — DIY. Winter thaws still flood basements. Confirm it runs.
• Test the generator if you have one — DIY. And never run it indoors or in the garage — CO risk.

Safety detectors

• Test every smoke and CO detector — DIY. Winter has the highest home-fire and CO rates of the year. Fresh batteries, and replace expired units.
• Confirm fire extinguishers are charged — DIY.

Why skipping winterizing gets expensive

The failures winter prep prevents are among the most destructive a home faces. A single burst pipe can release water for hours before anyone notices, and water damage restoration averages around $3,867 — with a serious burst running well into five figures once you add drywall, flooring, and mold remediation at $1,200–$3,750. An ice dam that pushes water into your ceilings does the same kind of damage. A heating system that quits in a freeze can cascade into frozen pipes throughout the house.

Nearly every one of those outcomes is prevented by tasks that cost nothing but an afternoon. That's the whole case for winterizing: the cheapest maintenance you'll ever do stops the most expensive damage your home can suffer.

The five-minute triage list

If a cold snap is bearing down and you've done nothing: drain the outdoor faucets, set the thermostat to at least 55°F, open under-sink cabinets, let exterior-wall faucets drip, and confirm you can find the main water shutoff. Those five buy you protection tonight. Everything else can happen this weekend.

For the full-year picture, our year-round maintenance schedule and the fall checklist get you set up long before the freeze.

FAQ

At what temperature do pipes freeze? Pipes are at risk when the temperature drops below about 20°F, and exposed or exterior-wall pipes freeze fastest. Keeping the home above 55°F and letting faucets drip during hard cold dramatically cuts the risk.

How do I prevent ice dams? Keep the attic cold: add insulation and seal air leaks so heat doesn't escape and melt the underside of the snow, and keep gutters clear. Roof heat cables and raking snow off the eaves help, but insulation is the real fix.

Is it worth leaving the heat on when I travel in winter? Yes. Set it no lower than 55°F, and consider having someone check the house. A home that loses heat in a freeze can suffer burst pipes throughout — far more costly than the heating bill you'd save.

How much does winterizing cost? Most of it is free or a few dollars in foam and caulk. Your only real costs are professional services — a furnace tune-up and, if you burn wood, a chimney sweep — both minor next to the emergencies they prevent.

Cost figures are 2026 national averages for general information only, not quotes. Your price depends on your specific job, home, and location. Always get a written estimate before authorizing work.