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Winterize Your Home: A Simple Pre-Season Safety Checklist

June 15, 2026

Winter hits a house from multiple angles at once. Frozen pipes in the basement. Warm air leaking out of every window gap. Gutters clogged with October leaves turning into November ice dams. The time to deal with all of this is not the week before the first freeze — it’s a mild Saturday in early fall when you can still work outside without gloves.

I start my winter prep the weekend after the clocks fall back. It’s a ritual now. Coffee, a notepad, and a couple of hours of checking things off before the weather turns. Here’s the list.

1. Hunt Down Every Draft

Windows and doors that leak air in summer leak even more in winter, and the temperature difference makes them obvious. Use a flashlight held at a low angle against trim and under sills — the beam will flicker or bend where cold air is pushing through. A stick of incense works even better. Hold it near edges and watch the smoke trail. If it wavers or blows sideways, you found a leak.

For gaps up to 1/8 inch wide, apply weatherstripping with the adhesive backing pressed firmly into place. For cracks wider than that, use a caulking gun with paintable silicone or acrylic latex caulk. Exterior doors with gaps at the bottom get a door sweep or a draft stopper. This is the most tedious hour of winter prep and the one that pays off on every heating bill from November to March.

I once found a gap under a kitchen window so wide I could see daylight. The previous owners had stuffed a paper towel in it. Paper towels are not insulation. Caulk is insulation.

2. Wrap Every Exposed Pipe

Pipes in unheated basements, crawl spaces, garages, and along exterior walls freeze before you realize they’re cold. Foam pipe wrap tape is the fix — it’s split down one side, slides over the pipe, and seals with a peel-off adhesive strip. A few dollars covers every exposed pipe in a typical house.

Before wrapping, tighten any loose pipe straps with a screwdriver. A pipe that can rattle is a pipe that can crack when it freezes and expands. Pay extra attention to pipes near foundation vents, sill plates, and anywhere you can feel cold air with your hand. If you wouldn’t sleep outside in January, don’t leave your pipes exposed either.

3. Give the Heating System a Test Run

Don’t wait for the first 40-degree night to find out the furnace is dead. On a mild day, turn the thermostat to heat mode and let it run for 15 minutes. Walk through the house and check every supply vent for airflow. Listen for grinding, banging, or a high-pitched squeal that wasn’t there last year.

Weak airflow in one room usually means a closed damper or a disconnected duct, not a system failure. But if multiple vents are weak or the system is making new sounds, write down what you hear and feel. Schedule an HVAC technician before peak season hits. The first cold snap of the year books every HVAC company solid for two weeks. Early fall is the sweet spot — you can still get same-week service.

Change the furnace filter while you’re at it. A dirty filter restricts airflow and makes the system work harder. I change mine on the same day as this checklist so I don’t have to remember a separate date.

4. Clean the Gutters (Safely)

Water that can’t drain through clogged gutters backs up into the roof edge and freezes there. That’s an ice dam. Ice dams force water under shingles and into the attic, and that damage costs thousands.

Set your ladder on dry, level ground. Have someone hold the base. Clean out leaves and debris by hand or with a plastic gutter scoop — metal tools gouge the gutter material. Once they’re clear, check that downspout extensions carry water at least 3 feet away from the foundation. If an extension is missing or crushed, replace it. Foundation water damage in winter comes from standing meltwater that has nowhere to go.

If your roof is steep, your gutters are high, or you just don’t want to be on a ladder, hire this out. Gutter cleaning costs $100 to $200. A fall from a ladder costs a lot more.

5. Test Every Smoke and CO Detector

Heating season means furnaces, fireplaces, and space heaters are running. Carbon monoxide risk goes up. Press and hold the test button on every smoke detector and CO detector in the house. Replace batteries immediately if the alarm is faint or silent. Check the manufacture date on the back of each unit — smoke detectors expire after 10 years, CO detectors after 5 to 7 years. If it’s past that date, the sensor may not work even with fresh batteries.

Record the test date and which units got new batteries. Six months from now you won’t remember, and the notes will.

6. Reverse the Ceiling Fans

Most ceiling fans have a small switch on the motor housing that changes the blade direction. In summer, counterclockwise pushes air down and creates a cooling breeze. In winter, clockwise at low speed pulls cool air up toward the ceiling and pushes warm air that’s trapped up there back down into the room.

Stand under the fan and switch it to clockwise. Turn it on low. You should feel no breeze at all — just a gentle redistribution. If you feel a draft, the speed is too high. This takes 30 seconds per room and makes a noticeable difference in rooms with high ceilings.

7. Drain and Shut Off Outdoor Faucets

A garden hose left connected to an outdoor spigot traps water inside the fixture. When that water freezes, it expands and cracks the pipe inside the wall. The leak doesn’t show up until spring when you turn the water back on and discover you’re watering the inside of your drywall.

Locate the interior shut-off valve for each outdoor spigot — usually in the basement or crawl space directly behind the faucet. Turn it off. Then go outside, open the spigot fully, and let any remaining water drain out. Leave the spigot open all winter. Disconnect every hose, drain them, and store them indoors.

I forgot to drain one spigot in my first house. The pipe froze, cracked inside the wall, and on the first warm day in March, water poured through the garage ceiling. The repair cost more than every other task on this list combined. I set a phone reminder every October now. “Drain the spigots.” It’s the cheapest insurance you’ll ever set an alarm for.

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