Plumbing Tasks to Do Before Winter

Three jobs decide whether your plumbing makes it through winter intact: getting water out of anything that sits outdoors, insulating the pipe runs that lose your home’s heat, and making sure the water heater and your main shutoff are ready before the cold leans on them. Everything else on a fall list is a smaller version of one of those three. This guide sequences them the way a freeze actually arrives, so you knock out the time-sensitive items before the first hard freeze and leave the ones that can wait for a calmer weekend.

Why the order matters: cold does not threaten every part of your plumbing equally, and it does not threaten them at the same time. An outdoor faucet with a hose still attached can split on the first night that drops below freezing. A well-insulated interior pipe can ride out the whole season. Treating both as the same urgent task wastes the narrow window you have in October and November. The point of a fall punch list is to spend that window on the things that fail first.

A note on scope before you start. This is the seasonal checklist, not the deep procedure for any single task. Where a step needs its own walkthrough, you will find a pointer to the guide that owns it. And if you are leaving the home cold and empty for the winter rather than living in it, you are doing a different job entirely. That is a full drain-down, covered in our guide on how to winterize your home’s plumbing (128), not the heat-it-and-live-in-it prep this list is built for.

Why Fall Is the Window to Prep Plumbing for Cold

Fall is the prep window because freeze damage is almost entirely preventable beforehand and almost impossible to undo afterward. Once water in a pipe freezes, it expands, and the Department of Energy puts the stakes plainly: if the water in your pipes starts freezing, you run the risk of that pipe exploding. There is no fixing that in January. The whole game is played in the weeks before the first hard freeze.

The temperature that triggers trouble is lower than most people expect, and it does not take a deep cold snap. The Department of Energy notes that southern states generally start having issues with frozen pipes when the temperature reaches about 20 degrees Fahrenheit. In colder regions, exposed pipes are at risk well before that. The practical takeaway is that “before winter” really means before the first night the forecast dips toward freezing, not the first heavy snow. If you wait for winter to feel like winter, you have likely missed the outdoor-faucet deadline.

Fall is also the cheap window. The fixes are foam pipe sleeves, an unscrewed hose, a thermostat dial, and an hour of looking around. The alternative is a burst line that floods a wall cavity for hours before anyone notices. To understand which runs in your house are actually exposed and why a pipe ruptures where it does, see our guide on why pipes freeze and which ones are most at risk (124). This list assumes you know the risk exists and focuses on what to do about it this season.

Disconnect and Drain Outdoor Water Sources Before the First Freeze

This is the one task with a hard deadline, so do it first: disconnect every garden hose, drain your outdoor faucets, and clear any in-ground irrigation before the first freezing night. Outdoor water sources are the most exposed plumbing you own, and a hose left attached over a cold night is what splits a faucet you forgot to drain.

The American Red Cross gives the standard sequence: remove, drain, and store hoses used outdoors, close the inside valves supplying outdoor hose bibs, open the outside hose bibs to allow water to drain, and keep the outside valve open so that any water remaining in the pipe can expand without breaking it. Run that sequence on every spigot before the temperature drops, including the one on the far side of the house you rarely use.

Do this for the faucets first, because they freeze first, then handle irrigation. The hose-bib technique itself, including frost-free versus standard faucets, where the interior shutoff lives, and exactly why a connected hose causes the failure, is its own short job covered in our guide on how to winterize outdoor faucets and hose bibs (160). In-ground sprinkler lines are a separate matter, because gravity alone will not clear water from buried pipe. The EPA recommends winterizing an irrigation system by shutting off the water supply and draining the lines before freezing weather arrives. Many systems need compressed-air blowout to clear them fully, which is covered in our guide on how to winterize a sprinkler or irrigation system (163).

One often-missed item belongs here: a shut-off hose bib still on a long, unheated run can hold water in the pipe behind it. If your outdoor spigot feeds from a line crossing an unheated garage or crawl space, the freeze risk is the buried pipe, not just the visible faucet.

Find and Insulate the Pipes Most Exposed to Cold

Insulate the pipe runs that lose your home’s ambient heat first, because those are the interior pipes that freeze even in a heated house. The Department of Energy points specifically to pipes in colder parts of your house, like crawl spaces or attics, that don’t get any of your home’s ambient heat, and recommends insulating them to cut heating costs and avoid burst pipes.

Walk the unheated edges of your home and look for exposed supply lines. The American Red Cross lists the usual offenders: outdoor lines, pipes in unheated interior spaces like basements and crawl spaces, attics, garages, and pipes running against exterior walls that have little or no insulation. Foam pipe sleeves slip over accessible runs in minutes and need no tools. The goal is not to heat the pipe, it is to slow how fast it loses heat to the cold air around it.

A few low-effort moves pay off here. The Red Cross advises keeping garage doors closed if there are water supply lines in the garage, and opening kitchen and bathroom cabinet doors during a cold snap so warmer room air can reach the plumbing under sinks on exterior walls. For the runs you genuinely cannot reach or insulate, letting cold water drip from the faucet served by those exposed pipes during a hard freeze relieves the pressure that actually bursts a pipe. Whether a steady drip is worth it on a given night is its own decision, covered in our guide on whether to leave faucets dripping in a freeze (130).

Insulating exposed runs is a clearly safe homeowner task: you are sliding foam over the outside of a pipe, not opening the plumbing. If a run is buried inside a finished wall or the only fix involves rerouting pipe, that is a job for a licensed plumber, not a fall checklist item. The strategy of matching each fix to the specific pipe it protects is laid out in our guide on how to prevent pipes from freezing (125); this list just flags it as a fall priority.

Service the Water Heater Before Peak Winter Demand

Set the water heater up for the season it is about to work hardest in: confirm the temperature setting and address sediment before winter loads it down. Incoming water is colder in winter, so the heater runs longer and harder to reach your set temperature, and a tank already strained by sediment has the least margin exactly when you need the most hot water.

Start with the setting, because it is the easiest win. The Department of Energy recommends keeping the water heater at the warm setting of 120 degrees Fahrenheit, which also slows the mineral buildup and corrosion that shorten a tank’s life. That single dial covers both winter efficiency and scald safety. The temperature decision in full, including the scald and Legionella trade-offs, lives in our guide on the right water heater temperature setting (054).

Sediment is the other fall item. Over a year, minerals settle to the bottom of a storage tank and form a layer that makes the burner or element work harder to push heat through. Going into the heaviest-use season, a tank you have never flushed is a tank running at a disadvantage. Flushing it is within reach for many homeowners, but the actual drain-and-flush procedure has real cautions around power, gas, and the drain valve, so it gets its own walkthrough in our guide on how to flush sediment from a water heater (057).

Two boundaries matter here. First, anything inside the water heater beyond the temperature dial and a basic flush is not a casual fall task. Replacing elements, touching the gas valve, relighting a pilot, or chasing a leak from the tank itself is licensed-plumber work. We give no step-by-step for the gas or internal side of a heater in this guide. Second, if you ever smell gas near a gas-fired heater, leave the building and call your gas utility from outside before doing anything else. For the safe way to cut gas to the appliance, see our guide on how to safely shut off gas to a plumbing appliance (136).

Know Where Your Main Shutoff Is Before You Need It

Find your main water shutoff and confirm it actually turns now, in daylight, before a burst pipe forces you to find it in the dark. A frozen pipe that splits keeps flooding until someone closes the main, and the minutes you spend hunting for an unlabeled valve in a freezing basement are minutes of water pouring into your walls. Locating it is a fall task precisely because winter is when you are most likely to need it fast.

The main shutoff is usually where the water line enters the home, often near the meter in a basement, a crawl space, a utility closet, or an outside box in milder climates. Find it, make sure it is reachable and not buried behind storage, and tag it so anyone in the house can spot it. If it is a wheel-style gate valve that has not moved in years, know that forcing a corroded valve can break it, which is a reason to confirm it works now rather than discover it is seized during an emergency. The technique for actually shutting off the main, and what to do if the valve is stuck, is covered in our guide on how to shut off the water to your whole house (131); this list just makes sure you have located and checked it before the cold.

While you are in fall-prep mode, fix the small drips you have been ignoring. The EPA notes that fixing easily corrected household leaks can save homeowners about 10 percent on their water bills, and household leaks waste more than 1 trillion gallons nationwide each year. A slow drip is also a freeze hint: a faucet that already weeps is a spot where water lingers. A quick way to check for a hidden leak is to read your meter before and after a two-hour stretch with no water running, and if it moves, water is going somewhere it should not.

A Printable Pre-Winter Plumbing Checklist

Run this list once before the first hard freeze, in roughly this order, since the outdoor items have the tightest deadline:

Disconnect, drain, and store every outdoor hose.
Close interior shutoffs to outdoor faucets, then open the spigots to drain and leave them open.
Clear or schedule a blowout for in-ground sprinkler and irrigation lines.
Walk the garage, crawl space, attic, and basement for exposed supply pipes and sleeve them with foam insulation.
Keep garage doors closed where supply lines run through the garage.
Note which under-sink cabinets sit on exterior walls so you can open them during a hard freeze.
Confirm the water heater is set to 120 degrees, and flush sediment or schedule it before peak demand.
Locate the main shutoff, confirm it turns, and tag it so anyone can find it.
Fix lingering faucet, toilet, and valve drips, and run a quick meter check for hidden leaks.
If exposed runs cannot be insulated, plan to drip those faucets during the coldest nights.

This is the heat-it-and-live-in-it list. If you are leaving the home cold for the season, switch to the full drain-down in our guide on how to winterize your home’s plumbing (128), and if you are leaving for an extended stretch, see our guide on how to protect plumbing in a vacant or vacation home (129). For the warm-season counterpart to this list, see our guide on spring and summer plumbing maintenance tasks (179), and for the full year-round calendar, see our guide on a year-round home plumbing maintenance checklist (177).

This is general information for seasonal home plumbing maintenance and is not professional advice. Conditions vary by home, and gas appliance and water-heater internal work in particular can be hazardous.

Frequently Asked Questions

When exactly should I do these tasks?
Before the first hard freeze, not the first snow. Southern regions can start seeing frozen-pipe trouble around 20 degrees Fahrenheit, and colder regions see exposed pipes at risk sooner. Aim to finish the outdoor items, especially disconnecting hoses and draining hose bibs, by early to mid fall, since those have the tightest deadline. Insulation, water-heater setup, and locating the shutoff can follow on a calmer weekend.

Which fall plumbing task has the tightest deadline?
Disconnecting outdoor hoses and draining the hose bibs. Outdoor faucets sit on the most exposed plumbing you own and can split on the first freezing night, while an insulated interior pipe can wait. The outdoor work costs nothing, takes minutes, and meets the tightest deadline on the list, so it goes first.

Do I need to drain my pipes for winter?
Only if you are leaving the home cold and unheated. If you are living in the house and keeping the heat on, you do not drain the system. You insulate exposed runs, prep the water heater, and keep the heat steady. Full draining is a separate procedure for homes that will sit cold for the season.

Is it safe to flush my own water heater?
Setting the temperature dial is simple and safe. A basic flush is within reach for many homeowners, but it involves the drain valve and cutting power or gas first, so follow a proper walkthrough and stop if anything feels uncertain. Anything beyond a flush, such as gas-valve work, element replacement, or a tank leak, is a job for a licensed plumber.

Should I leave faucets dripping all winter?
Not as a default. A steady drip helps only during a hard freeze, and only for faucets served by pipes you could not insulate or reach. The better fall move is to insulate those runs ahead of time so you do not rely on dripping at all. Dripping is the backup for the pipes you cannot protect, decided night by night.

Sources

U.S. Department of Energy, Turn Down the Temperature, but Don’t Let Your Pipes Freeze!: https://www.energy.gov/energysaver/articles/turn-down-temperature-dont-let-your-pipes-freeze
U.S. Department of Energy, Do-It-Yourself Savings Project: Lower Water Heating Temperature: https://www.energy.gov/energysaver/do-it-yourself-savings-project-lower-water-heating-temperature
U.S. Department of Energy, Fall and Winter Energy-Saving Tips: https://www.energy.gov/energysaver/fall-and-winter-energy-saving-tips
American Red Cross, Preventing and Thawing Frozen Pipes: https://www.redcross.org/get-help/how-to-prepare-for-emergencies/types-of-emergencies/winter-storm/frozen-pipes.html
U.S. EPA WaterSense, Fix a Leak Week: https://www.epa.gov/watersense/fix-leak-week
U.S. EPA WaterSense, Sprinkler Spruce-Up: https://www.epa.gov/watersense/sprinkler-spruce-up