Winter Weather Preparedness: Power Outage Guide

The Threat Hierarchy: What Actually Kills People in Winter

Before discussing gear and checklists, understand what you are actually defending against. Winter storms are dangerous in ways that are not obvious from weather forecasts.

Extended power outages are the master threat. A blizzard or ice storm that takes down the grid for three to seven days — or longer — creates every other problem on this list. Without power, your electric furnace stops. Your sump pump stops. Your phone charger stops. The pipes in your exterior walls slowly cool toward the ambient outdoor temperature. Everything else in this guide flows downstream from that one scenario.

Frozen and burst pipes come second. A burst pipe in a wall cavity can release hundreds of gallons of water before you find it. In a house that has lost heat, the damage timeline is measured in hours, not days. Repairing burst pipes and the resulting water damage routinely costs five figures.

Carbon monoxide poisoning is the hidden killer. Every winter, dozens of Americans die from CO poisoning directly caused by their response to cold — running a generator in the garage, using a gas oven for heat, burning charcoal indoors, running a camp stove in a closed bedroom. These are not edge cases. The CDC estimates that roughly 400 Americans die from non-fire-related CO poisoning each year, with winter spikes correlated directly to storm events.

Hypothermia can develop indoors. The stereotype is a person caught outside in a storm. The reality is that many hypothermia deaths occur inside homes that have lost heat — primarily among elderly individuals whose thermoregulation is impaired. A 65-degree interior feels uncomfortable to a healthy adult. To an 80-year-old, it can be medically dangerous.

Vehicle emergencies complete the picture. People die in cars during winter storms because they were unprepared, underestimated road conditions, or got stranded without supplies. The vehicle scenario is distinct from the home scenario and requires its own kit.

Work through this guide in threat order: power outage prep first, then pipe protection, then CO safety, then warming strategies, then vehicle prep.

Home Winterization: Before the Season Starts

The most effective winter preparedness happens before the first forecast. Once a storm is named, stores run out, prices spike, and tradespeople are booked out. The window is September through early November depending on your region.

Pipe Insulation

Pipes in exterior walls and unheated spaces — crawlspaces, garages, attics, basement rim joists — are freeze candidates. Foam pipe insulation sleeves cost a few dollars per linear foot and take under an hour to install. This is the single best return-on-investment action you can take for winter home prep.

Specific priority areas:

Any pipe running through an exterior wall or outside-facing cabinet
Pipes in an unheated crawlspace or basement
The outdoor hose bib (shutoff from inside and drain the line before the first freeze)
Any pipe near a garage door where air infiltration is high

Weatherstripping and Air Sealing

Heat loss through door gaps and window leaks directly translates into higher heating bills and a home that cools faster if you lose power. Inspect every exterior door with a flashlight at night — if you can see light around the frame, cold air and heated air are exchanging freely.

Replacements are straightforward:

Door sweep on the bottom of exterior doors (foam or vinyl brush type)
Foam weatherstripping tape on door frames
Window rope caulk for drafty windows you will not open during winter (removable in spring)
Outlet gaskets on exterior wall electrical outlets (a surprisingly significant source of infiltration)

A well-sealed home retains heat hours longer during an outage than a leaky one — and that time margin matters.

Heating System Service

Have your furnace, boiler, or heat pump serviced annually before winter. A technician will clean the heat exchanger, check combustion efficiency, test safety shutoffs, and replace the filter. The cost is typically under $150 and prevents mid-winter failures.

Three things to do yourself before the season:

Replace the air filter (a clogged filter makes your system work harder and can trigger limit switches that shut it down)
Test your thermostat by running a heating cycle
Clear the area around furnace vents and returns — blocked airflow causes equipment damage

If you have a chimney and use a fireplace or wood stove, have the flue inspected and swept annually. Creosote buildup is a fire hazard. A blocked flue from a bird nest or debris is a CO hazard.

Generator Prep

If you own a generator, the time to service it is before you need it.

Run it under load for 30 minutes in October. Change the oil if it has been sitting. Drain old fuel or add a fuel stabilizer if the unit will sit over the winter. Test the transfer switch if you have a whole-house unit.

If you do not own a generator and are considering one, a portable inverter generator in the 2,000 to 3,500-watt range runs a refrigerator, a few lights, and device charging simultaneously — covering the core needs without running the whole house. A standby whole-house generator (7,500 watts and above) provides automatic failover and can run a heating system.

Critical rule before we go further: generators run outside, period. The “runs it in the garage with the door open” approach has killed people. Carbon monoxide from a running engine travels through the structure, through the car exhaust port, under doors, and through any opening. Ten feet away from the house with the exhaust pointed away from windows and doors is the minimum. We will return to CO at length below.

The Winter Power Outage: Heating Alternatives

Your primary heat is almost certainly tied to the grid in some way — even a gas furnace needs electricity to run the blower, igniter, and control board. When power goes out in winter, you need a plan for heat that does not depend on grid power.

Propane Heaters

Mr. Heater’s Big Buddy and Portable Buddy heaters are the most widely used indoor-safe propane heaters among preppers and emergency responders. The Big Buddy produces 18,000 BTUs and can heat a space up to 450 square feet. Both units have automatic shutoffs triggered by tip-over and by low-oxygen detection.

Fuel requirements: A 1-pound propane canister lasts roughly 3 to 6 hours on high. For a multi-day outage, you need the adapter to run the heater from a 20-pound tank (the standard grill-size cylinder). A full 20-pound tank at high output runs approximately 14 to 24 hours depending on settings.

Ventilation is not optional. “Indoor-safe” propane heaters still consume oxygen and produce water vapor and trace CO. The recommendation is to crack a window or door one to two inches in the room you are heating. This sounds counterintuitive, but proper combustion with minimal ventilation produces far less CO than combustion starved of oxygen. A CO detector in the room is required — not recommended, required.

Storage: Never store propane tanks indoors. The garage, a storage shed, or an outdoor-rated box is appropriate. Keep at minimum four 1-pound canisters or one full 20-pound cylinder per expected week of outage. See our propane storage guide for safe handling and rotation practices.

Kerosene Heaters

Kerosene heaters are powerful — a mid-range unit produces 23,000 to 30,000 BTUs, enough to heat a large room or small open-plan space. They burn longer per fuel volume than propane and kerosene stores well for years when properly treated. A single gallon heats for roughly eight to ten hours.

The tradeoffs: kerosene heaters produce more odor than propane, require wick maintenance, and need the same ventilation precautions. Buy 1-K grade kerosene (the cleaner formulation) from a hardware store or fuel retailer — do not use the colored K-2 kerosene or jet fuel substitutes, which produce significantly more CO and soot.

Never use gasoline in a kerosene heater. It is not a fuel substitution — it is a fire.

Wood Stoves and Fireplaces

A properly installed and maintained wood stove or masonry fireplace is the gold standard for off-grid winter heat. It requires no fuel infrastructure except your woodpile, produces real warmth, and creates a psychological anchoring point during a prolonged outage.

The requirements are also real: you need a properly sized stove, an inspected and swept flue, dry seasoned wood (minimum 12 months of drying), and knowledge of how to operate it safely. If you do not have a wood stove and are considering installing one, do it before winter, not during.

If you have a fireplace insert but rarely use it, test it before winter. Confirm the damper operates, confirm there is no obstruction in the flue, and have a supply of dry wood accessible. An insert used twice a year can still serve as an emergency heat source if you know how to operate it.

The one heating method to skip: gas ovens and kitchen ranges. Running an oven for heat is a documented source of CO deaths every winter. It was not designed to run for hours uninterrupted, it does not heat efficiently, and it consumes oxygen in an enclosed space. This includes “just heating the kitchen for a bit.” The answer is no.

The Temperature Numbers That Matter

Two temperature thresholds govern your winter outage decisions.

55 degrees Fahrenheit interior: Keep your home above this temperature to dramatically reduce burst-pipe risk. Below 55 degrees, pipes in exterior walls and poorly insulated spaces begin approaching freezing. This is your “maintain heat at minimum” target when you are trying to conserve fuel but keep the house protected.

20 degrees Fahrenheit exterior: This is the approximate threshold at which pipes inside exterior walls can freeze even when the house has some residual heat, especially if the cold has persisted for 12 hours or more and wind chill is accelerating heat loss through the structure. When outdoor temperatures drop below 20 degrees, open cabinet doors under sinks on exterior walls, let faucets drip slightly, and maintain interior temperatures at 55 degrees or above.

If you have already lost power and temperatures are dropping: prioritize getting heat going before the interior drops below 55 degrees. The action required to save pipes is easier before they freeze than after.

Staying Warm Without Heat: Layering and Room Consolidation

If you have no functional heating source — or while you are waiting for one — the goal is to conserve body heat as aggressively as possible.

The Layering System

Your body is constantly generating heat. The layering system retains that heat rather than dissipating it.

Base layer: Merino wool or synthetic moisture-wicking material. This layer sits against skin. Its job is to move moisture (sweat and condensation) away from your body. Cotton fails here — wet cotton loses insulating value and accelerates heat loss. This is where “cotton kills” as a survival axiom comes from.

Mid layer(s): Fleece, down, or synthetic insulation. This layer traps warm air. A 200-weight fleece jacket plus a down puffy jacket over it provides substantial insulation for indoor conditions. Wool sweaters are effective mid layers and available cheaply at thrift stores.

Outer layer: Wind and moisture resistance. Indoors, this matters less — but in drafty homes or when you need to go outside, a shell jacket and waterproof pants complete the system.

For sleep: sleeping bags rated to 15 to 20 degrees Fahrenheit will keep most healthy adults warm in a 40-degree indoor environment. Put two people in a double sleeping bag or zip two individual bags together for additional warmth. Sleeping pads or a foam mat under the sleeping bag are as important as the bag itself — you lose enormous body heat to the cold floor.

Room Consolidation

The physics are simple: heating a 200-square-foot bedroom is far easier than heating a 1,500-square-foot house. When the power goes out in winter, choose the best room and commit to it.

The best room is typically:

Small with minimal exterior wall exposure
Has a door that seals well
Located toward the interior of the house (not a corner room with two exterior walls)
On the middle floor if you have a multi-story home (heat rises, but ground-floor rooms lose heat to the cold ground)

Hang heavy blankets or moving blankets over windows (use painter’s tape or tension rods). Stuff a rolled towel along the bottom of the door. Seal vents in unused rooms so your heating source concentrates its output in the occupied space.

Carbon Monoxide: The Specific Threat

Carbon monoxide is produced by incomplete combustion of any carbon-based fuel — gasoline, propane, natural gas, kerosene, charcoal, wood. It is odorless, colorless, and kills quickly at high concentrations.

Symptoms of CO exposure: headache, dizziness, weakness, nausea, shortness of breath, confusion, and loss of consciousness. These symptoms mimic the flu and often develop gradually. People have died in their sleep from CO poisoning because they had no detector and mistook early symptoms for illness.

What kills people every winter, documented:

In February 2021 during the Texas winter storm, dozens of CO poisonings were reported across the state in a single week. The causes were consistent: generators running in garages, cars left running in attached garages, and propane grills brought inside. The scale was unusual but the causes were not — this pattern repeats every winter storm season in every region of the country.

A 2023 CDC report on non-fire CO poisoning found that heating and cooking equipment account for the majority of residential cases. The spike in cases consistently correlates with winter storm events and power outage periods.

Rules without exceptions:

No generator inside the house, basement, or attached garage — ever. Minimum 20 feet from any window or door, exhaust pointed away from the structure.
No charcoal grill, propane grill, or camp stove indoors. The patio, covered porch with open sides, or outdoors only.
No gas oven used as a space heater.
No car left running in an attached garage, even with the door open. Garages do not seal from the living space and CO migrates through gaps in the drywall.

CO detectors: Install one on each floor of your home, including in the bedroom. Battery-powered or battery-backup units maintain protection during power outages when hardwired units may fail. Test monthly. Replace the unit every five to seven years — CO sensors degrade. If the detector alarms, get everyone outside immediately and call 911. Do not re-enter the home until emergency services have cleared it.

Water Supply During a Freeze

Two water problems occur in winter outages: pipes freeze and stored water freezes.

Preventing pipe freezing: Keep the home above 55 degrees Fahrenheit, open cabinet doors under exterior-wall sinks, let faucets drip a thin stream, and disconnect garden hoses from outdoor spigots. If you are leaving the home for several days during a cold spell, do not turn the heat completely off — set the thermostat to a minimum of 55 degrees and open the cabinet doors under sinks before you leave.

If a pipe freezes: A frozen pipe has not necessarily burst yet. Apply gentle heat with a hair dryer, heating pad on a low setting, or warm (not boiling) water on the pipe. Never use an open flame. Start heating from the faucet end and work toward the frozen section. Keep the faucet open so water and steam can escape. If a pipe has burst, shut off the water main immediately and call a plumber.

Stored water in winter: If you store water in an unheated garage or outbuilding, it will freeze. Frozen water in rigid plastic containers can crack the container as it expands. Keep emergency water storage inside the heated envelope of the home. During an outage, the water stored in your hot water heater tank (typically 40 to 50 gallons) remains liquid for a significant period and is a usable emergency water source — turn off the gas or power to the unit before drawing from the drain valve.

Winter Vehicle Emergency Kit

A vehicle kit for winter is different from a standard roadside kit. The threat profile shifts: you may be stranded for hours in sub-freezing temperatures with no outside help reaching you quickly.

See our full vehicle emergency kit guide for the complete year-round checklist. The winter-specific additions:

Warmth:

Two wool or fleece blankets per person who regularly rides (Mylar emergency blankets compress smaller but wool blankets are warmer and more durable for multi-hour use)
Hand warmers — HeatMax HotHands 40-hour warmers, kept in the glove box, not the trunk
Dry socks and waterproof boots or a pair of thick boot liners in a zip bag
Extra winter hat and gloves — these get wet, lost, or forgotten

Traction and extraction:

Ice scraper with a long-handle snow brush (accessible from the interior, not buried in the trunk)
25-pound bag of kitty litter or traction sand — pour under the drive wheels if you are spinning on ice
A compact folding shovel for digging out of a drift
Traction boards (MAXTRAX or budget equivalents) if you drive frequently in snow

Signaling:

LED road flares — visible for over a mile, reusable, do not create a burn hazard in snow
Hi-visibility safety vest — wear it before you step outside on any road or highway shoulder

Navigation:

Printed paper map of your region — GPS systems fail in extreme cold, and cell service is unreliable in rural winter storms
Know your route before you leave if conditions are severe

The non-negotiable rule for vehicle emergencies: If you are stranded and running the engine for heat, crack a window one to two inches and check that the exhaust pipe is not buried in snow. A buried exhaust pipe on a running vehicle can fill the cabin with CO in under 20 minutes. This causes deaths every winter in snowstorms. Check the exhaust pipe before running the engine.

Ice Storm Versus Blizzard: Different Scenarios

Winter storms are not uniform. Ice storms and blizzards create different operational challenges.

Blizzard prep priorities:

Fuel and food before the forecast — stores empty within hours of a serious forecast
Know how long you can survive in place — two weeks of food and water, multiple days of fuel for a heating alternative
Do not drive unless absolutely necessary — blizzard conditions can pin you to the road with no visibility and no traction
Snow on the roof: after 18 to 24 inches of heavy wet snow, flat roofs and low-pitch roofs face structural load risk. A long-handled roof rake can remove snow from eaves without climbing on the roof.

Ice storm prep priorities:

Ice storms are harder to predict and more immediately dangerous than blizzards. A quarter inch of ice can make sidewalks and roads impassable and snap tree limbs onto power lines at a scale a blizzard rarely achieves.
Power outages from ice storms are often longer than blizzard outages because ice-coated infrastructure is harder to repair — expect three to seven days of potential outage, not 24 hours.
Walking and outdoor movement: strap-on ice cleats (Yaktrax or equivalent) allow walking on ice-covered ground safely. Falls on ice are a significant cause of winter injury, particularly for elderly individuals.
The road clearing timeline after a major ice storm is slower than after snow — budget extra time even after the weather passes.

Helping Elderly Neighbors: The Most At-Risk Population

The elderly are statistically the most likely to die in a winter weather event, and most of those deaths are preventable.

The reasons are physiological and situational. Aging reduces the body’s ability to sense and respond to cold — an 80-year-old may not feel cold the same way a 40-year-old does, even as their core temperature drops to dangerous levels. Social isolation means they may not have anyone checking on them. Fixed incomes mean they may have been under-heating their homes before the storm as a cost-saving measure. Mobility limitations mean they may be unable to respond even if they recognize the problem.

Before winter: Check in with elderly neighbors and family members. Do they have a working furnace? A backup heat source? Adequate food for a week-long outage? Many do not. A simple pre-season conversation can identify gaps before they become crises.

During a winter storm or outage:

Check on elderly neighbors within the first six hours of a significant outage, not at the 24-hour mark
Bring food that requires no cooking — protein bars, peanut butter, crackers, shelf-stable soup
Offer to let them stay in your home if you have heat; the option to have them come to you is more effective than hoping they will ask
Watch for signs of hypothermia: shivering (in early stages) followed by absence of shivering, confusion, slurred speech, and drowsiness — these last symptoms indicate dangerous progression

Core temperature for hypothermia: Body temperature below 95 degrees Fahrenheit is clinical hypothermia. At 86 degrees, most people are unconscious. Rewarming a person with serious hypothermia requires medical attention. In the meantime: move them to a warm environment, remove wet clothing, cover them with blankets, and provide warm (not hot) non-alcoholic beverages if they are conscious and can swallow.

Winter Power Outage Checklist

Use this as a quick reference to verify you are covered across the major threat areas.

Before the season:

Pipe insulation on all exterior-wall and crawlspace pipes
Weatherstripping and door sweeps on all exterior doors
Furnace serviced and filter replaced
Generator serviced and tested under load
Propane or kerosene fuel stock verified
CO detectors tested and batteries replaced
Winter vehicle kit staged in each vehicle

When a storm is forecast:

Two weeks of food and water on hand before the forecast hits stores
Propane or kerosene supply verified for the expected outage duration
Prescriptions filled for 30-day supply
Phone and power banks charged
Vehicle tank filled

When power goes out:

Activate heating alternative in the designated room
Open cabinet doors under exterior-wall sinks, let faucets drip
Verify CO detector is functioning and placed in occupied room
Check exhaust vent if operating any combustion appliance
Check on elderly neighbors

For the foundation supplies underlying all of the above, see our home power outage checklist, which covers the full list of supplies for any extended outage regardless of season. For vehicle preparation, our vehicle emergency kit guide covers the complete year-round kit with winter additions. For fuel storage guidelines including propane and kerosene quantities and rotation schedules, see our propane storage guide.

Winter Preparedness FAQ

How do you stay warm during a winter power outage? Consolidate to one interior room and close it off from the rest of the house. Use a properly vented propane or kerosene heater rated for indoor use, layer clothing starting with a moisture-wicking base layer followed by insulating mid-layers and a wind-blocking outer layer, use sleeping bags rated for below-freezing temperatures, and hang heavy blankets over windows and doors to trap heat. A single small room retains warmth far better than trying to heat the whole house.

At what temperature do pipes freeze? Pipes inside exterior walls can begin freezing when outdoor temperatures drop below 20 degrees Fahrenheit, though it depends on insulation quality, wind chill, and how long temperatures stay low. The interior threshold that matters is your home temperature: keep the house above 55 degrees Fahrenheit to significantly reduce burst-pipe risk. Even unoccupied homes should be kept at 55 degrees or warmer during a freeze.

Sources: CDC Carbon Monoxide Poisoning Prevention; NOAA Winter Weather Safety; FEMA Ready.gov Winter Storms; American Red Cross Winter Storm Safety; U.S. Fire Administration heating fire data; National Weather Service Winter Storm Preparedness.

Frequently Asked Questions

How do you stay warm during a winter power outage?

Consolidate to one interior room and close it off from the rest of the house. Use a properly vented propane or kerosene heater rated for indoor use, layer clothing starting with a moisture-wicking base layer followed by insulating mid-layers and a wind-blocking outer layer, use sleeping bags rated for below-freezing temperatures, and hang heavy blankets over windows and doors to trap heat. A single small room retains warmth far better than trying to heat the whole house.

At what temperature do pipes freeze?

Pipes inside exterior walls can begin freezing when outdoor temperatures drop below 20 degrees Fahrenheit, though it depends on insulation quality, wind chill, and how long temperatures stay low. The interior threshold that matters is your home temperature: keep the house above 55 degrees Fahrenheit to significantly reduce burst-pipe risk. Even unoccupied homes should be kept at 55 degrees or warmer during a freeze.