How to winterize your home by climate: steps for hard-freeze, occasional-freeze, mild and no-freeze winters

Pick the band that matches your normal winter, not your worst one on record. Hard freeze means days below freezing every year. Occasional freeze means a few cold snaps most winters. Mild and wet means frosts but rarely a deep freeze. No freeze means frost is rare or unknown where you live.

These four bands are a practical sorting tool for this article, not an official classification. If you are on a boundary, use the colder list. A cold snap in a place that seldom freezes can do more plumbing damage than a normal winter in a place that always does.

The Winter Ready home checklist from the Insurance Institute for Business & Home Safety (IBHS) makes the same point. It says southern regions are more susceptible to plumbing problems during extreme cold, while northern regions are more vulnerable to snow loads and ice dams.

• Hard freeze: the ground freezes, snow lies for weeks and daytime temperatures stay below freezing for days at a time.
• Occasional freeze: winters are mostly above freezing, with a few nights or days of hard frost in most years.
• Mild and wet: long, cool, damp winters with frosts and only the odd short freeze.
• No freeze: frost is rare or unknown, and winter is either the wet season or simply the cooler, drier part of the year.

Four jobs apply everywhere: clean the gutters, check the roof, test the main water shut-off and service the heating you have. Draining outdoor taps and irrigation, insulating pipes and holding the heat when away matter only where it freezes. Damp control matters most in mild, wet winters and in humid no-freeze climates.

Use the table as a filter. Any row marked "No" for your column can be skipped. The sections after it explain how to do each job in your climate.

Work from the outside in before the first hard frost. Drain hoses, outdoor taps and irrigation. Insulate pipes in unheated spaces and seal the gaps around them. Service the heating and keep the thermostat at 55°F (12.8°C) or higher. Then clear the gutters and check the roof and attic to limit ice dams.

Every plumbing step here has one aim: no water left sitting where it can freeze. The steps below follow the IBHS checklist, with the ice dam advice from the US National Weather Service.

1. Disconnect and drain hoses and outdoor taps. IBHS says that if your outdoor faucets are not frost-proof (it notes homes built before 2010 typically lack them), turn off their valve inside the home or cover them from outside. Maintainly’s task library sets winterizing outdoor taps once a year in late fall.
2. Shut down the irrigation system. IBHS lists draining irrigation systems alongside outdoor faucets and hoses. Follow the installer’s or manufacturer’s method for your system, or book a contractor for a sprinkler blowout.
3. Insulate pipes in unheated spaces. IBHS names attics, crawl spaces and all outside walls, and says to wrap pipes and faucets in unheated or minimally heated areas.
4. Seal the gaps. Insulate and seal around vents, plumbing, piping and wiring that pass through an exterior wall, and caulk and weatherstrip windows and doors.
5. Service the heating and hold the heat. IBHS advises preventative HVAC maintenance before winter and a thermostat set to at least 55°F (12.8°C) to help prevent frozen pipes.
6. Find and test the main shut-off. If a pipe bursts, this valve is what stops the water. Maintainly’s library schedules a main water shut-off test every six months.
7. Clear gutters and downspouts, then check the roof. IBHS says to route downspouts so water discharges at least 3 to 4 feet from the foundation, and to book a roof inspection ahead of winter weather.
8. Check attic insulation and ventilation. The US National Weather Service guidance on roof ice dams says they form when roof snow melts and refreezes. It reports that most experts want at least R-30 attic insulation, with R-38 preferable in northern climates, plus clear airflow from the eaves to the roof vents.

What to do in a cold snap

IBHS advises opening cabinet doors where pipes run next to an outside wall and letting faucets drip during extreme cold. It also says to clear snow from the furnace exhaust vent after a storm. If no water flows from a tap, IBHS says to shut off the water supply and call a plumber.

Protect the pipes that sit in unheated spaces, because those are the ones a short cold snap reaches. Insulate pipes in the attic, crawl space, garage and outside walls, drain outdoor taps and irrigation before the first freeze, keep the heat on when you travel, and know where the main shut-off is.

The International Code Council’s article on frozen water pipes, citing IBHS, says unprotected pipes generally begin to freeze when outdoor temperatures drop to 20°F (-7°C). Treat that as a planning number, not a guarantee. A pipe in a draughty attic or wall can freeze in milder weather.

The same article quotes the International Plumbing Code commentary: insulation without a heat source cannot protect a pipe from freezing. Insulation slows heat loss; it does not add heat. That is why the cold-snap actions matter as much as the autumn preparation.

1. Before winter: insulate exposed pipes, seal gaps in outside walls, and disconnect hoses.
2. Before a forecast freeze: shut off and drain outdoor taps and irrigation, and cover any tap you cannot isolate.
3. During the freeze: keep the thermostat at 55°F (12.8°C) or higher day and night, open cabinet doors on outside walls, and let faucets drip in extreme cold, as IBHS advises.
4. If you are away: leave the heating on and ask someone to check the house.

Split the work between a short freeze list and a longer damp list. Lag the pipes and water tank in the loft, service the boiler and leave the heating on low when away. Then keep rainwater out and moisture moving: clear gutters, check the roof, use extractor fans and heat the home steadily.

The Met Office advice on frozen or burst pipes covers the freeze list for a UK-style winter. It says to insulate pipes in the loft and other cold areas, have the boiler serviced, test the stop tap twice a year and leave the heating on low if you go away.

Damp is the larger winter problem in this climate. The UK government guidance on damp and mould describes condensation as the most common form of damp. It forms when moisture made indoors meets colder parts of the building, and it is more likely in homes that are under-heated or poorly ventilated.

1. Lag loft pipes and the water tank. The Met Office guide to getting a property winter ready says to insulate water pipes and tanks in the loft with good quality lagging.
2. Book the boiler service before the cold. Maintainly’s library sets the boiler service and gas safety check at every 12 months. Gas work is for a registered engineer only.
3. Clear gutters and drainpipes after leaf fall. The Met Office warns that blocked gutters can back up and let water into the roof and walls. Maintainly’s library puts gutter cleaning at every six months.
4. Check the roof before the windy months. Look for loose tiles, slates and flashing, as the Met Office advises. Use binoculars from the ground or hire a roofer; do not climb onto a wet roof.
5. Keep moisture moving. Run extractor fans when cooking and showering, and keep the home heated steadily. Check cold corners and the wall behind large furniture through the winter.
6. Renew failed sealant and draught strips. Maintainly’s library schedules a window and door seal check once a year. Do not block purpose-made vents while draught-proofing.

Not against frost. Skip the pipe insulation, tap draining and irrigation blowout. Winter preparation in a no-freeze climate means getting the house ready for rain, wind and humidity: clear gutters and downpipes, inspect the roof, check seals around openings, confirm water drains away from the house, and service any heating you use.

1. Clear gutters and downpipes before your wet or storm season, and check that they discharge away from the walls.
2. Inspect the roof for lifted tiles or shingles, cracked flashing and blocked valleys. Maintainly’s library sets a roof inspection every six months and after major storms.
3. Check the seals around windows, doors and roof penetrations.
4. Clear surface drains and grates, and look for places where water pools against the house after rain.
5. Test the sump pump if the house has one. Maintainly’s library sets this every three months.
6. Service the heating you have and clean the filters before first use, following the manufacturer’s instructions.
7. Control indoor moisture in humid areas. Use exhaust fans in the kitchen and bathroom, and keep the gutters maintained.

Finish the freeze-protection jobs before your area’s first hard frost: hoses, outdoor taps, irrigation and pipe insulation. Book the heating service in late summer or early autumn, before engineers get busy. Clean the gutters after most of the leaves have fallen. In the southern hemisphere, the same sequence runs through autumn, from March to May.

The jobs do not share one date. Draining the outdoor taps has to happen before the frost. Gutter cleaning works best after leaf fall, which often comes later. Doing both on one weekend means one of them is done at the wrong time.

Your national weather service publishes frost forecasts and climate averages for your area, so use those to set the first date and work forward. The fall home maintenance checklist puts the wider autumn jobs in order.

• Late summer to early autumn: heating service, chimney sweep if you burn solid fuel, roof check.
• Before the first hard frost: hoses, outdoor taps, irrigation, pipe insulation, sealing gaps.
• After leaf fall: gutters and downspouts.
• All winter: test smoke and carbon monoxide alarms. IBHS says to test them at least once a month.