How to Winterize Your Home: 15-Point Checklist
- Burst pipes are one of the costliest winter insurance claims — prevention costs almost nothing.
- Air sealing (weatherstripping and caulk) reduces heating costs more per dollar than insulation alone.
- Clean gutters before the first freeze to prevent ice dams that can damage your roof and interior.
- Have your furnace or heat pump serviced before you need it, not after it fails on the coldest night of the year.
- Outdoor faucets and irrigation systems need draining before temperatures drop below 28°F.
A few hours of preparation in fall can prevent thousands of dollars in winter damage. Frozen pipes, ice dams, drafty windows, and a furnace that fails in January are all preventable with timely attention. This 15-point checklist is organized by priority and location — start with the highest-risk items and work through the rest at a comfortable pace before the first hard freeze in your area.
Plumbing and Water Systems
1. Shut Off and Drain Outdoor Faucets
Outdoor hose bibs are the most common source of frozen pipe damage. Water left in an outdoor line can freeze, expand, and burst the pipe inside the wall — often without visible exterior damage until you turn the faucet on in spring and water pours through your interior wall. Turn off the supply valve feeding each outdoor faucet (usually located inside the home near the exterior wall), then open the outdoor faucet to drain residual water. Leave the outdoor faucet slightly open through winter.
If your outdoor faucets are “frost-free” (the handle stem is 8–12 inches long), they’re designed to drain automatically — but only if a hose is not left attached. Remove all hoses before winter; a connected hose traps water in the standpipe and defeats the frost-free design.
2. Drain and Winterize Your Irrigation System
In-ground irrigation systems must be fully drained before the first hard freeze (28°F or below). Water remaining in underground pipes can freeze and crack PVC fittings, valve bodies, and backflow preventers — repairs can run $200–$1,000. Irrigation winterization involves either blowing out the lines with compressed air (the most thorough method) or manual draining through drain valves. If you’re not familiar with the blowout process, hiring a professional for this one task is worth the $75–$150 it typically costs. For details on maintaining and upgrading your system, see our guide on smart irrigation systems.
3. Know Where Your Main Water Shutoff Is
Every adult in the household should know where the main water shutoff valve is located and how to operate it. When a pipe bursts, the difference between a minor leak and catastrophic flooding is the time it takes to get the water off. Find the valve now, confirm it operates (stuck valves are common in older homes), and label it clearly.
4. Insulate Pipes in Unconditioned Spaces
Pipes running through unheated crawl spaces, garages, attics, or exterior walls are vulnerable to freezing even in moderate climates. Foam pipe insulation sleeves (available for $0.50–$1.00 per linear foot) dramatically reduce freeze risk. For high-risk areas, electric heat tape provides active freeze protection when temperatures drop below freezing. Pay particular attention to pipes on north-facing exterior walls and any supply lines running through the garage.
Heating Systems
5. Schedule a Furnace or Heat Pump Tune-Up
HVAC technicians are busiest in October and November — which is when most furnaces reveal problems after sitting unused all summer. Schedule a tune-up in September when appointment availability is better. A professional inspection covers heat exchanger integrity (a cracked heat exchanger leaks carbon monoxide), burner condition, filter replacement, and thermostat calibration. A typical tune-up costs $80–$150 and can identify a $200 repair before it becomes an $800 emergency replacement.
6. Replace HVAC Filters
A clogged filter restricts airflow, forces the blower motor to work harder, and reduces heating efficiency. Replace standard 1-inch filters at the start of heating season and again midway through (January or February). Thicker media filters (4–5 inch) can typically go the full season. Write the replacement date on the filter frame with a marker so you don’t lose track.
7. Check Carbon Monoxide Detectors
Heating season is when CO incidents spike. Test every CO detector in the home and replace batteries. CO detectors over 5–7 years old should be replaced entirely — the electrochemical sensors degrade over time regardless of battery condition. If you have a gas furnace, water heater, or attached garage, a functioning CO detector on each level of your home is non-negotiable.
Building Envelope: Air Sealing and Insulation
8. Caulk Around Windows and Exterior Penetrations
Air leakage around windows, doors, and utility penetrations (pipes, wires, vents) can account for 25–40% of heating energy losses in older homes. Inspect existing caulk for cracks and gaps — it shrinks and hardens over time. Re-caulk anywhere you can see daylight, feel a draft, or where the existing bead has cracked or separated. Use paintable silicone-latex caulk for painted surfaces; all-silicone for areas that stay wet.
9. Weatherstrip Exterior Doors
Slide a piece of paper under a closed exterior door. If it moves easily, air is infiltrating around the door. Replace worn weatherstripping on the door sides and top (the door stop gasket), and replace the door sweep on the bottom. A full weatherstripping kit for one door costs $20–$40 and takes about 30 minutes to install. The payback in reduced heating costs is typically less than one heating season.
10. Check Attic Insulation
Heat rises, and inadequate attic insulation is one of the biggest sources of heating loss in older homes. The recommended R-value for attic insulation varies by climate zone — most northern U.S. climates call for R-38 to R-60. Look down from the attic hatch: if you can see the ceiling joists (the wooden framing members) above the insulation, you likely don’t have enough. Adding blown insulation is a project many homeowners do themselves with rented equipment, or hire out for $1,500–$3,000 for an average-sized attic with significant long-term energy savings.
Roof, Gutters, and Exterior
11. Clean and Inspect Gutters
Clogged gutters in winter lead to ice dams — ridges of ice that form at the roof edge and force meltwater to back up under shingles, into the attic, and eventually into interior walls and ceilings. Clean all gutters and downspouts thoroughly before the first freeze. While you’re on the ladder, inspect the gutter hangers, check for rust or holes, and confirm downspouts are directing water at least 4 feet away from the foundation. Our complete gutter cleaning guide covers the process in detail.
12. Inspect the Roof
You don’t need to walk the roof to spot obvious problems. From the ground with binoculars, or from a ladder at the eave, look for lifted, curled, or missing shingles; damaged flashing around chimneys, skylights, or vents; and any dark staining that suggests previous moisture intrusion. Minor repairs cost little to address in fall; ignored, they become interior water damage after a freeze-thaw cycle or ice dam.
13. Protect Outdoor Equipment and Furniture
Drain and store garden hoses (water left in a coiled hose can freeze and crack the casing). Store or cover patio furniture. Drain and fog two-stroke engines in lawn equipment (mowers, string trimmers, leaf blowers) that won’t be used for more than 30 days — stale fuel gums up carburetors. Alternatively, add a fuel stabilizer if you prefer not to drain the tank. Disconnect and store battery-powered equipment’s batteries in a temperature-controlled space.
Lawn and Landscape
14. Final Lawn Mowing and Winterization
Mow your lawn slightly lower than normal for the last cut of fall — 2–2.5 inches for cool-season grasses, 1.5–2 inches for Bermuda. Tall grass matted under snow develops snow mold disease. Don’t cut so short that you stress the crown, but a slightly lower final cut reduces disease risk significantly. For a complete fall lawn care timeline, visit our Lawn Care Guide.
15. Protect Sensitive Plants and Trees
Wrap young or cold-sensitive trees (newly planted specimens especially) with burlap to protect from frost, wind desiccation, and deer browse. Apply an anti-desiccant spray to broadleaf evergreens (hollies, rhododendrons, boxwoods) in late November before the ground freezes — it dramatically reduces winter burn. Mulch the root zones of perennials and tender shrubs to insulate against freeze-thaw cycles that heave roots out of the ground.
Putting It All Together
Work through this checklist starting in late September or early October — well before the first freeze. Most items take under an hour individually; the whole list can be accomplished over two or three weekend afternoons. For ongoing tracking of these and other maintenance tasks throughout the year, our Home Maintenance Checklist organizes all key seasonal tasks in one place.
FAQ: Winterizing Your Home
At what temperature do pipes freeze?
Water pipes can begin freezing when exterior temperatures drop to 20°F or below — but the freeze risk depends heavily on whether the pipes are in heated or unheated spaces. Pipes in exterior walls or unheated crawl spaces can freeze at slightly above 32°F if there is sustained cold and no heat source nearby. Interior pipes in heated spaces rarely freeze unless the heat fails or they’re on an exterior wall without adequate insulation. As a rule of thumb, any time temperatures are forecast below 28°F for 4 or more hours, vulnerable pipes should be protected.
How do I know if I have ice dams?
Ice dams look like large ridges of ice along the lower edge of your roof or icicles hanging from the eaves. They form when heat escaping from the living space warms the roof and melts snow, which then refreezes at the colder overhang. Signs of active ice dam damage include water stains on interior ceilings or walls, paint peeling near exterior walls, and sagging drywall tape. Addressing attic insulation and air sealing is the permanent fix; ice dam removal (using a roof rake to clear snow) prevents new dams from forming after snowfall.
Should I leave my heat on when the house is vacant in winter?
Yes — never allow an occupied or potentially occupied home to drop below 55°F in winter. At 55°F, pipes are protected from freezing in most situations. If you’re away for an extended period, shut off the water supply at the main valve and drain the system for complete protection. Simply lowering the thermostat without shutting off the water creates risk if the heat fails while you’re away.
Is professional winterization worth it?
For irrigation systems, almost certainly yes — the cost of a blown fitting or cracked valve body easily exceeds the service charge. For whole-home winterization tasks, most capable homeowners can handle the checklist above without professional help. Where professionals add the most value: furnace inspection (requires technical expertise and liability if something goes wrong), roof inspection (safety risk), and irrigation blowouts (requires a specific size of air compressor). Get a free quote below to compare the cost against your time.
Get a Free Home Maintenance Quote
Winterization tasks pile up quickly, and some — like irrigation blowouts, furnace servicing, and roof inspections — are best left to professionals. Get connected with local home maintenance experts for a free, no-obligation estimate on any or all of these fall prep services.
