A freeze is in the forecast, and suddenly every pipe in the house feels like a question mark. Should you drip the faucets? Open the cabinets? Cover the outdoor spigots? What happens if the power goes out—or if you are not going to be home?
The short answer is to act before temperatures fall: keep the home heated, disconnect garden hoses, identify vulnerable plumbing, locate the main water shutoff, and follow the freeze instructions issued by your local water utility or property manager. During the cold spell, watch for reduced water flow, keep appropriate indoor pipes exposed to warm room air, and never use unsafe equipment to heat the house or thaw a pipe.
This guide is organized by timing so you can focus on what to do now, what to monitor during the freeze, and how to respond if something goes wrong. For broader seasonal preparation beyond plumbing, use our Winter Home Maintenance Checklist: Prepare Before the First Freeze.
Why Freezing Risk Is Different for Every Home
Water freezes at 32°F (0°C), but that does not mean every pipe fails the moment the outdoor temperature reaches that number. Risk depends on how low the temperature falls, how long it stays there, wind exposure, insulation, indoor heat, and where the plumbing runs.
A house designed for long Minnesota winters may protect its water lines differently from a home in Texas, Georgia, or another area where hard freezes are occasional. In a milder climate, plumbing may pass through attics, exterior walls, garages, crawl spaces, or other areas that become cold quickly. An unusual cold snap can therefore create problems even if the temperature would seem routine somewhere else.
Do not rely on a national “safe temperature” or a single social-media rule. Check the forecast for your exact location and look for guidance from your water utility, city, property manager, and equipment manufacturers. The duration of the freeze and the possibility of a power outage can matter as much as the lowest number shown on the forecast.
24–48 Hours Before the Freeze
Check the forecast, not just the date
Look at the hourly forecast and any watches or warnings. Note when temperatures are expected to fall below freezing, how long they may remain there, whether strong wind is expected, and whether ice or snow could interrupt power. This gives you a real deadline instead of treating winter preparation as a vague seasonal task.
If the forecast changes, adjust. A brief overnight dip and a multi-day hard freeze are not the same situation, particularly for a house in a normally warm climate.
Find the main water shutoff
Locate the valve that controls water entering your home before there is an emergency. Common locations include a garage, utility room, basement, crawl-space entrance, near the water heater, or where the service line enters the building. Some properties use an exterior meter or valve that should be operated only by the utility or with a specific tool.
Make sure the shutoff is accessible, but do not force, dismantle, or experiment with a valve you cannot identify. If the valve is corroded, stuck, or unclear, contact a plumber or the water provider. Everyone responsible for the home should know the location and understand whom to call if a pipe breaks.
If your home has a fire-sprinkler system, shutting off or draining the domestic water supply may affect fire protection. Never deactivate that system without appropriate professional or local guidance.
Identify the pipes most exposed to cold
You do not need a complete plumbing diagram. Start with the areas most likely to lose heat: pipes in exterior walls, garages, attics, crawl spaces, unfinished basements, under manufactured homes, beside foundation vents, and inside cabinets against outside walls.
Look for visible gaps that allow outdoor air to reach plumbing, missing insulation, or a pipe that already feels significantly colder than the room. Do not disturb unknown insulation or seal intentional vents. Long-term repairs involving walls, wiring, heat tape, or difficult access should be handled correctly rather than improvised hours before a freeze.
Disconnect hoses and prepare outdoor faucets
Remove every garden hose, splitter, timer, or other attachment from exterior faucets. A connected hose can trap water at the fixture. Drain the hose and store it if possible.
What happens next depends on the plumbing. Some homes have frost-free sillcocks, some have interior shutoffs for exterior lines, and others rely on insulated covers and local winterization practices. Follow the procedure for your fixture and climate. A foam faucet cover may add protection where recommended, but it is not a substitute for disconnecting the hose or addressing vulnerable plumbing.
Irrigation systems, pools, outdoor kitchens, RV connections, detached buildings, and livestock water lines may have separate procedures. Do not use compressed air or close unfamiliar valves unless you know the system and the correct method.
Keep indoor heat reaching vulnerable plumbing
Keep the heating system operating and avoid dramatic thermostat setbacks during the coldest period. If water supply lines run through an attached garage, keep the garage door closed except when entering or leaving.
For kitchen or bathroom plumbing located against an exterior wall, opening the cabinet doors can allow warmer room air to circulate around the pipes. Move cleaners, medications, sharp objects, and other hazards out of reach of children and pets before leaving cabinets open.
Do not block heating vents with furniture, curtains, or storage. If one room is unusually cold, leave interior doors open when appropriate so conditioned air can circulate, but never compromise required fire doors or building-safety features.
Decide whether a faucet should drip
This is one of the most common questions—and one of the least useful places for a universal rule. Many local utilities recommend allowing a small trickle from a faucet served by especially vulnerable plumbing during severe cold. Others provide different instructions based on local systems, water conservation, building type, or expected conditions.
Do not turn on every faucet simply because the temperature reaches 32°F. Identify which line is exposed and follow local utility or property-management advice. If dripping is recommended, the instruction may specify cold water, a particular faucet, or a small combined flow from a single-handle fixture. A slow drip is not a guarantee against freezing, and a blocked drain can create a separate overflow problem.
The practical rule is: use dripping strategically only when reliable local guidance says it is appropriate for your home and forecast.
Prepare for a possible outage
Charge phones and power banks. Gather flashlights, batteries, drinking water, necessary medications, blankets, shelf-stable food, and important contact numbers. Test smoke and carbon monoxide alarms according to their instructions.
Know how the garage door, security system, smart locks, and any electrically operated water equipment behave without power. If someone in the home relies on powered medical equipment, make a specific backup plan before the storm.
During Freezing Temperatures
Keep the heat on and check the colder areas of the home periodically. Pay attention to sinks on exterior walls, plumbing near the garage, and rooms that normally receive less heat. Continue any cabinet-door or faucet measures recommended locally.
Turn faucets on briefly enough to notice a major change in flow. A weak trickle or no water from one fixture while others work normally can indicate a frozen section. Do not repeatedly force handles or assume the problem is at the faucet itself.
Walk around the interior and look for new moisture, ceiling stains, damp cabinets, or unusual sounds. Check accessible exterior appliance vents from the ground and keep snow or debris from blocking them according to the equipment instructions. Never climb onto an icy roof or use a ladder in unsafe conditions.
Use portable heaters only as their manufacturer directs. Place them on a stable surface, keep combustible items at least three feet away, plug electric units directly into a suitable wall outlet, and turn them off when leaving the room or sleeping. Never use an oven, outdoor grill, camp stove, or charcoal device to heat the home.
If You Are Leaving Home During a Freeze
Do not turn the heat off. Many utilities and insurers commonly reference a minimum indoor setting around 55°F, but your home, plumbing, policy, and local weather may require something different. Follow the most relevant instructions for your property.
Close windows securely, leave appropriate interior doors or sink cabinets open, and take the same outdoor-plumbing steps you would if staying home. Ask a trusted person to check the house, especially during a prolonged freeze or outage. Give that person the shutoff location, your contact details, and the number for a plumber or property manager.
Water-leak sensors or a monitored thermostat can provide useful alerts, but they do not replace physical preparation. A notification is only helpful if someone can respond.
Some homeowners choose to shut off and drain parts of a plumbing system before a long winter absence. That is a property-specific procedure and can interact with boilers, water heaters, irrigation, appliances, well systems, and fire sprinklers. Arrange professional guidance rather than turning valves at random on the way out the door.
If the Power Goes Out
Conserve indoor heat by limiting unnecessary door opening and closing off unused spaces only when doing so will not isolate vulnerable plumbing from heat. Keep monitoring indoor temperature and follow local emergency instructions. If the home can no longer remain safely warm, go to a designated warming location rather than relying on unsafe heating methods.
A portable generator must operate outdoors, at least 20 feet from the house, with exhaust directed away from doors, windows, vents, and neighboring buildings. Never run one in a home, garage, basement, shed, porch, or carport—even with doors open. Follow the generator instructions for weather protection, refueling, and electrical connection. Never connect it to household wiring without approved transfer equipment installed correctly.
Keep battery-powered carbon monoxide alarms operating. If an alarm sounds, or anyone develops symptoms such as headache, dizziness, nausea, weakness, or confusion around fuel-burning equipment, move outside to fresh air and call emergency services.
If indoor temperature continues to fall and pipes are at risk, contact the water utility, plumber, property manager, or local emergency information line for instructions. Shutting off and draining the system may sometimes be appropriate, but it is not a universal step and should not be improvised when fire sprinklers or heating equipment are connected.
How to Recognize a Frozen Pipe
The first sign is often little or no water from a faucet during freezing weather. You might also notice frost on an accessible pipe, an unusually cold section, or a change in shape. A frozen area may be hidden inside a wall, attic, or crawl space, so the visible faucet is not always near the blockage.
Before attempting to thaw anything, look and listen for evidence of a split pipe or active leak. Water may not escape until the ice begins to melt. Know where the main shutoff is and keep the area around it clear.
Call a licensed plumber if the frozen section is inaccessible, you cannot identify it, the pipe is damaged, water is near electrical equipment, or you are unsure how the plumbing is arranged.
What to Do If an Accessible Pipe Freezes
If the pipe appears intact and local guidance considers homeowner thawing appropriate, keep the affected faucet open. Begin warming the pipe gently at the faucet end and work toward the frozen section so melting water and pressure have a path to escape.
Use a controlled source such as an electric heating pad, towels soaked in hot water, or a hair dryer only in a dry area and according to its safety instructions. Keep electrical devices away from standing water and combustible materials.
Never use a blowtorch, propane heater, charcoal stove, open flame, or other high-heat device. Excess heat can damage the pipe and create a fire risk. Do not leave the thawing process unattended.
Continue gentle heat until normal flow returns, then inspect the entire accessible line for leaks. If you cannot restore flow, stop and call a plumber. A pipe behind a wall or in a confined area is not an invitation to cut into the building without knowing what else is there.
If a Pipe Bursts or Starts Leaking
Shut off the main water supply if you can do so safely and know that it is the correct valve. Open a safe faucet to relieve remaining pressure, then contact a plumber. If water is near outlets, appliances, the electrical panel, or exposed wiring, do not enter standing water or handle electrical equipment. Call emergency services or the utility when necessary.
Use containers and towels only when the area is safe. Move belongings away from water, photograph visible damage, and notify the insurance company according to the policy. Renters should contact the landlord or emergency maintenance line immediately and document when the problem was reported.
Do not assume the leak is minor because the water stops after the shutoff. Moisture can travel inside walls, floors, and ceilings, and proper drying may be necessary to limit further damage.
After Temperatures Rise
Keep watching the plumbing as the house warms. Ice may thaw gradually, and a split can begin leaking after the coldest weather has passed. Check under sinks, around water heaters and appliances, along accessible pipes, and beneath any ceiling or wall area where plumbing runs.
Restore dripping faucets and cabinet doors to normal once local guidance says the freeze risk has ended. Remove temporary faucet covers only when appropriate, and reconnect hoses later—not immediately after the first warmer afternoon if another freeze is forecast that night.
If you find damp drywall, warped flooring, staining, musty odors, or unexplained water use, investigate promptly. Photograph the condition and contact the right professional instead of covering the area and hoping it dries on its own.
Finally, write down what you learned. Record the coldest rooms, vulnerable fixtures, shutoff location, supplies used, and any professional recommendations. The next cold snap will be much easier when the house already has its own freeze plan.
Freeze Preparation for Renters
Renters can take meaningful precautions without altering the plumbing. Read messages from the landlord or property manager, keep the heat at the required setting, disconnect a personal garden hose when permitted, open designated cabinets, and report missing heat, leaks, damaged insulation, or exposed pipes promptly.
Do not access locked utility rooms, shut off building-wide water, install heat cable, or modify shared plumbing without authorization. Ask which faucet—if any—should drip and who handles exterior spigots, vacant neighboring units, or common areas.
Save the emergency maintenance number before the freeze begins. If a pipe freezes or leaks, report it in writing as well as by phone when possible, protect your belongings only when safe, and keep photos and timestamps. Lease terms and local laws vary, so follow the property’s instructions rather than assuming homeowner procedures apply to a multi-unit building.
Quick Freeze Preparation Checklist
☐ Check the hourly forecast and duration of the freeze
☐ Locate and clear access to the main water shutoff
☐ Identify plumbing in exterior walls and unheated spaces
☐ Disconnect garden hoses and attachments
☐ Prepare outdoor faucets according to local guidance
☐ Keep the heating system running
☐ Open cabinets around vulnerable pipes when appropriate
☐ Follow local guidance about dripping a specific faucet
☐ Close garage doors if water lines pass through the garage
☐ Charge devices and gather outage supplies
☐ Test smoke and carbon monoxide alarms
☐ Arrange a home check if you will be away
☐ Save plumber, utility, landlord, and insurance contacts
Frequently Asked Questions
At what temperature do home pipes freeze?
There is no single outdoor temperature that predicts when every pipe will freeze. Water freezes at 32°F, but pipe risk depends on exposure, insulation, indoor heat, wind, and how long the cold lasts. Treat local freeze warnings and utility guidance as the signal to prepare.
How long does it take a pipe to freeze?
There is no reliable universal number of hours. An exposed line in an unheated attic or garage can cool much faster than plumbing inside a well-insulated wall. A longer and colder event increases concern, but construction and airflow can change the outcome substantially.
Should I drip hot or cold water?
Follow your local water utility’s instructions for the vulnerable line. Many utilities recommend a small cold-water trickle from a faucet served by exposed plumbing; some give different advice for single-handle faucets or severe conditions. Do not waste water by dripping every fixture without a reason.
Should I open every cabinet door?
Usually, the useful cabinets are those containing plumbing against an exterior wall or in a colder area. Opening unrelated cabinets provides little benefit. Move hazardous products first if children or pets are present.
Should I shut off the water before a freeze?
Not routinely. An occupied, heated home usually follows preventive steps without shutting off the entire supply. A shutdown may be appropriate for a known leak, prolonged vacancy, failed heating, or specific local instruction, but it can affect appliances, heating systems, wells, and fire sprinklers. Get property-specific advice.
Do outdoor faucet covers really help?
An appropriate insulated cover may reduce exposure in some climates, but it cannot correct a damaged faucet, attached hose, missing shutoff, or unprotected pipe inside the wall. Treat it as one layer of preparation, not a guarantee.
Can I use a space heater near frozen pipes?
Only if the heater and location comply with the manufacturer’s instructions and fire-safety requirements. Never place a heater near water, combustible material, or inside a confined cabinet. Gentle, supervised heat on an accessible intact pipe is safer than trying to heat an entire hidden area.
Prepare Early, Then Pay Attention
The most useful freeze plan is not complicated. Before temperatures fall, understand the forecast, protect outdoor connections, keep heat reaching vulnerable plumbing, locate the shutoff, and prepare for an outage. During the freeze, watch water flow and indoor temperature. Afterward, inspect for leaks as the pipes thaw.
The details should come from the people who understand your local system: the water utility, property manager, plumber, equipment manufacturer, and emergency authorities. Combining that guidance with a simple timeline gives you something far more useful than a generic command to “drip the faucets.” It gives you a plan for the whole cold snap—from the first warning until the final thaw.