Winter is the most damaging season for homes. Frozen pipes, ice dams, heating failures, and drafts cost American homeowners billions every year — and most of it is preventable. This 15-step checklist covers everything you need to do before the first hard freeze.
Plumbing & Water
Water damage from frozen pipes is the most expensive winter home emergency, averaging $5,000–$70,000 per incident. These steps eliminate the risk.
Steps 1–4: Protect Your Pipes
1. Disconnect and drain all garden hoses — water left in hoses can freeze back into the spigot and crack it. 2. Shut off and drain outdoor irrigation systems — hire a pro to blow out in-ground systems with compressed air. 3. Insulate pipes in unheated spaces (garage, crawl space, basement) with foam pipe insulation ($0.50/foot). 4. Know where your main water shutoff is — in a pipe emergency, every second counts.
- Foam pipe insulation is the cheapest insurance you can buy — $20 covers most exposed pipes
- Set your thermostat no lower than 55°F if you leave for an extended period
Heating System
A heating failure in January is an emergency. These steps ensure your system is ready before you need it.
Steps 5–8: Prepare Your Heating System
5. Schedule a furnace or boiler inspection — ideally in September or October before demand peaks. 6. Replace the furnace filter — a clogged filter reduces efficiency by 15–25% and can cause overheating. 7. Test your thermostat by setting it to heat and confirming the system responds. 8. If you have a fireplace, have the chimney inspected and cleaned — creosote buildup is a fire hazard.
- HVAC tune-ups cost $75–$150 and can catch a $2,000 failure before it happens
- Keep a backup space heater for emergencies — but never leave it unattended
Exterior & Roof
Ice dams, wind damage, and water infiltration are the main exterior winter risks. These steps address all three.
Steps 9–12: Exterior Protection
9. Clean gutters after leaves have fallen — clogged gutters cause ice dams that can lift shingles and flood attics. 10. Inspect the roof for damaged or missing shingles — even small gaps allow water infiltration under freeze-thaw cycles. 11. Trim branches overhanging the roof — ice-loaded branches can fall and cause significant damage. 12. Check and seal any gaps in exterior caulking around windows, doors, and utility penetrations.
- Ice dam prevention starts with attic insulation — keep the roof cold and even
- Heated gutter cables ($50–$200) prevent ice dams in problem areas
Interior Preparation
Draft sealing and safety checks round out a complete winterization.
Steps 13–15: Interior Checks
13. Check weatherstripping on all exterior doors — you should feel no air movement with the door closed. Replace if worn. 14. Test smoke and carbon monoxide detectors and replace batteries — CO risk increases significantly in winter when homes are sealed tight and heating systems run constantly. 15. Reverse ceiling fans to clockwise rotation at low speed — this pushes warm air down from the ceiling and can reduce heating costs by 10–15%.
- Draft snakes under doors are a cheap temporary fix while you source new weatherstripping
- CO detectors should be replaced every 5–7 years regardless of battery status
Do This Before October 15
In most of the US, the first hard freeze arrives between mid-October and mid-November. Complete this checklist by October 15 to ensure you have time to schedule contractors for any issues you find — HVAC technicians and plumbers are booked solid once cold weather hits.
Need Help Winterizing?
From furnace tune-ups to pipe insulation and gutter cleaning, our vetted contractors handle every item on this list.