Winterizing a house means closing off every route that cold air, ice, and moisture use to cause damage. The work covers plumbing, gutters, the roof, windows, doors, plants, and outdoor equipment, and most of it should happen before the first hard freeze. A weekend of preparation can prevent cracked pipes, ice dams, and dead landscaping that cost far more than the materials involved. The same checklist applies whether you live in the house year-round or you are winterizing an unoccupied house before a long absence.
Drain the Sprinkler System
Water left in sprinkler lines freezes, expands, and cracks the pipes and heads. Start by turning off the water supply to the system and shutting down the automatic timer, then open every drain valve so the lines empty. Working through the steps for shutting down a home for cold weather in the right order keeps one forgotten valve from becoming a spring repair bill.
Drain the Valves Manually
- Shut off the water supply to the sprinkler system.
- Turn the automatic timer to the off position.
- Open each drain valve, starting with the lowest point.
- Lift the sprinkler heads one at a time to release trapped water.
- Leave the valves open until spring.
Blow Out the Lines With Compressed Air
For larger systems, an air compressor pushes remaining water out of the lines. Set the compressor to roughly 50 to 80 psi depending on the pipe material and zone length, and run each zone until only air comes out of the heads. Slower, steadier pressure is safer than a sudden blast, which can separate fittings.
When to Call a Professional
Systems with backflow preventers, check valves, or buried valve boxes are easy to damage with the wrong air pressure. If you are not sure about the configuration, a sprinkler company can blow out the lines in about an hour and will usually guarantee the work against freeze damage.
| Winterization Task | Best Time | Difficulty |
|---|---|---|
| Drain the sprinkler system | Early fall | Moderate |
| Disconnect and drain outdoor faucets | Early fall | Easy |
| Protect plants and garden beds | Early to mid fall | Easy |
| Store outdoor furniture | Mid fall | Easy |
| Clean gutters and downspouts | Mid fall | Moderate |
| Repair exterior steps and railings | Mid fall | Moderate |
| Organize snow removal tools | Mid fall | Easy |
| Trim trees and yard | Mid to late fall | Moderate |
| Insulate attic and pipes | Late fall | Moderate |
| Seal windows and doors | Late fall | Easy |
| Inspect the roof | Late fall | Moderate |
| Stock emergency supplies | Late fall | Easy |
| Test smoke detectors | Late fall | Easy |
| Service the HVAC system | Late fall | Moderate |
| Clean the chimney | Late fall | Moderate |
Protect Plants and Raised Garden Beds
Freezing temperatures kill tender perennials, crack clay pots, and heave soil in raised beds. Move container plants indoors or against the house, empty decorative pots that cannot survive the freeze, and cover beds that hold plants you want to keep. The steps for winterizing raised beds are straightforward once the soil work is done.
Mulch and Cover Tender Plants
Spread 2 to 4 inches of mulch over perennial beds after the first hard frost, when the ground has started to cool. The mulch keeps soil temperature steady instead of trapping summer heat. For shrubs and young trees, wrap the trunks in burlap or tree wrap to block sunscald and wind damage.
Water Trees and Shrubs Before the Freeze
Evergreens lose moisture all winter, so give them a deep watering in late fall before the ground freezes. Pile leaves around the base of tender plants as insulation, and move potted perennials into an unheated garage or against a sheltered wall so the roots stay above the coldest ground temperatures.
When to Prune
Most pruning should wait until the plant is fully dormant, usually after several hard frosts, or until late winter. Pruning too early encourages new growth that the first freeze will kill. Remove only broken or diseased branches during the fall cleanup.
Store Grills and Outdoor Furniture
Metal, fabric, and wood all break down faster when they sit through months of rain and snow. Cleaning and covering each item now adds years to its life, and the routine for winterizing your grill for seasonal storage is short enough to finish in an afternoon.
Deep-Clean the Grill
- Brush the grates while they are still warm and scrape off residue.
- Empty the grease tray and the ash catcher.
- Disconnect the propane tank and store it upright outdoors, away from doors and vents.
- Wipe the exterior and cover the grill once it is dry.
Furniture, Cushions, and Fabric
Wash cushions with mild soap and water, let them dry completely, and store them indoors if possible. Clean and dry wood furniture before covering it, because trapped moisture under a cover causes mildew. Metal frames benefit from a quick check for rust spots and loose joints.
Cover or Move Indoors
Furniture that fits in a garage, shed, or basement should go inside. Everything else needs a waterproof cover rated for outdoor use, strapped down so wind cannot pull it loose. Bungee cords and cover clips keep covers in place during winter storms.
Clean Gutters and Inspect the Roof
Blocked gutters are the most common cause of ice dams, the ridges of ice that form at the roof edge and push water back under the shingles. Clearing the gutters and checking the roof before snow arrives prevents water from working its way into the walls and ceiling. The inspection routine for winterizing your roof before cold weather arrives takes less than an hour with a ladder.
Clear Downspouts and Check Fasteners
- Remove leaves and debris from the gutters by hand or with a scoop.
- Flush the downspouts with a garden hose to confirm they drain.
- Reattach any loose gutter hangers or screws.
- Make sure downspouts extend at least 3 feet from the foundation.
Look for Loose Shingles and Flashing
Walk the roofline and check for lifted shingles, cracked flashing around chimneys and vents, and worn rubber boots around plumbing stacks. Small repairs are cheap in October and expensive in January, when crews are busy and materials are harder to source.
Ice Dam Warning Signs
Icicles along the eaves often mean heat is escaping through the attic and melting snow that refreezes at the edge. If you saw ice dams last winter, check attic insulation and ventilation before the next snow, and consider a heated cable along the first 3 feet of the roofline.
Seal Windows, Doors, and Interior Pipes
Drafts around windows and doors make the heating system work harder and drive up utility bills. Sealing the envelope is one of the highest-value tasks on the list because the materials cost little and the savings show up in every monthly bill.
Weatherstripping, Caulk, and Door Sweeps
- Replace worn weatherstripping around doors that let in light.
- Caulk gaps between window frames and the wall with exterior-grade caulk.
- Install door sweeps on exterior doors that scrape or show daylight.
- Add outlet gaskets behind switch plates on exterior walls.
Insulate Pipes and Check the Attic
Wrap exposed pipes in unheated spaces with foam insulation sleeves, and keep the garage door closed if water lines run through the garage. Check the attic for adequate insulation depth, usually 10 to 20 inches of blown or batt material depending on your climate zone.
Furnace, Chimney, and Detectors
Replace the furnace filter at the start of the season and have the system serviced if it has been more than a year. Clean the chimney if you burn wood, and test smoke and carbon monoxide detectors, replacing batteries and units older than 10 years. Stock emergency supplies like flashlights, blankets, and a basic tool kit in an easy-to-reach spot.
Protect Outdoor Water Fixtures and Irrigation
Hose bibs, rain barrels, and irrigation valves hold water that freezes into ice. Disconnect garden hoses and drain them, close the indoor shutoff valve for each outdoor faucet, and open the outdoor spigot so any remaining water can escape.
Drain Sprinkler Lines on a Budget
A manual drain takes no special tools, and winterizing your sprinkler system yourself for under $20 is realistic when you only need a hose, a valve key, and a few fittings. The money saved on a service call can go toward insulation and weatherstripping elsewhere in the house.
Rain Barrels, Spigots, and Irrigation Valves
Rain barrels should be emptied, disconnected, and tipped or stored upside down so they cannot fill with ice. Wrap exposed spigots with insulated covers, and drain irrigation valves by opening the bleed screws after the main supply is off. Each protected fixture is one less pipe that can burst, and the whole routine for protecting rain barrels, spigots, and irrigation takes an afternoon.
The Final Walkaround
Do one last circuit of the house before the first snow: gutters clear, hoses stored, covers strapped, valves drained, and detectors beeping their test tone. Tick every task off the schedule above and the house can sit through the season without a surprise.