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An ice storm rarely drops much precipitation, yet it can do more damage to a house than a foot of snow: ice snaps limbs onto roofs, pulls down power lines, and leaves homes without heat just as temperatures fall. That combination is exactly when frozen pipes burst. This guide covers what ice storm alerts mean, how to protect your pipes before and during the cold, what to do if a pipe freezes or breaks, and the short list of supplies that actually help.
Part of our Disaster Prep hub, a season-by-season guide to getting ready for whatever your region gets.
Key numbers to know
- About 1/4 inch of ice is the usual trigger for an Ice Storm Warning, the point where ice can snap power lines and bring down branches (National Weather Service).
- Ice can make a branch 30 times heavier or more. Accumulations of 1/4 to 1/2 inch break small branches and weak limbs; 1/2 to 1 inch breaks larger branches (Connecticut DEEP Forestry).
- A 1/8-inch crack in a pipe can release more than 250 gallons of water a day (State Farm).
- Just over $20,000 was State Farm’s average frozen-pipe claim in 2022, across nearly 9,000 claims (State Farm).
- No lower than 55°F: the Red Cross’s minimum thermostat setting if you leave home during cold weather (American Red Cross).
- At least 20 feet between a generator and any window, door or vent (CDC).
What ice storm and freeze alerts mean
The National Weather Service uses a ladder of products. The wording matters, because the step from “advisory” to “warning” is the step from a slippery morning to multi-day power outages.
| Alert | What it means | What to do |
|---|---|---|
| Winter Storm Watch | Conditions favor a significant winter storm, which may include heavy snow, sleet or an ice storm. | Finish prep now: fuel, batteries, prescriptions, pipe protection, charged devices. |
| Freezing Rain Advisory / Winter Weather Advisory | Minor icing or wintry weather that should not reach warning level, but travel may be difficult. Any amount of freezing rain makes roads and sidewalks dangerous. | Limit travel, salt steps and walkways, protect exposed pipes. |
| Ice Storm Warning | Usually issued for roughly 1/4 inch of ice or more. Travel becomes dangerous and power lines and branches can come down. NWS says these warnings typically arrive 12 to 36 hours ahead. | Expect a long outage. Set up backup heat and power plans, drip faucets, stay off the roads. |
| Winter Storm Warning | A significant event with snow, ice, sleet or blowing snow; travel may become difficult or impossible. | Stay home if you can; prepare for outages. |
Freezing rain vs. snow: why ice is worse for your house
Freezing rain falls as liquid and freezes on contact with anything below freezing: tree limbs, wires, gutters, cars, steps. It glazes every surface evenly, and unlike snow it doesn’t slide off. That’s why a modest amount of ice can do so much damage.
Major ice storms are uncommon in any one spot, but when one hits, the NWS lists the knock-on effects: falling trees and lines, outages lasting several days, loss of heat, blocked roads and damaged cell towers.
The math: how heavy ice gets
Ice weighs about 57 pounds per cubic foot. Here’s how quickly it adds up on a single utility line with a 1/2-inch diameter, coated with 1/2 inch of ice all the way around:
- Outer diameter of the iced line: 0.5 + (2 × 0.5) = 1.5 inches
- Ice cross-section = π × (0.75² − 0.25²) = π × 0.5 ≈ 1.57 square inches
- Ice per foot of line = 1.57 × 12 ÷ 1,728 ≈ 0.011 cubic feet × 57 lb ≈ 0.62 lb per foot
- Over a 150-foot span: 0.62 × 150 ≈ 93 extra pounds hanging between two poles, before any wind
This is a simplified illustration, not an engineering calculation, but it shows why a half inch of ice brings down lines and why the branches above your roof, driveway and service drop deserve a look every fall.
Why pipes freeze and which ones break first
Water expands as it freezes, and that expansion can split a pipe regardless of material, according to the American Red Cross. The pipes most at risk:
- Pipes exposed to outdoor cold: hose bibs, pool supply lines and sprinkler lines.
- Supply lines in unheated spaces: basements, crawl spaces, attics, garages and kitchen cabinets.
- Pipes running along exterior walls with little or no insulation.
A frozen pipe often doesn’t leak until it thaws, which is why the flood frequently starts a day or two after the coldest night.
From the trades: Almost every gas or propane furnace needs electricity to run its blower, igniter and control board, so an ice storm outage usually means no heat even with a full gas line. If you plan to run a furnace on backup power, have an electrician install a proper transfer switch or inlet; never backfeed through a dryer outlet. On high-efficiency furnaces and boilers, check that the plastic intake and exhaust pipes outside aren’t blocked by ice or drifted snow, because a blocked vent will shut the unit down. Heat pump owners: let the defrost cycle clear ice from the outdoor coil, and don’t chip at it with tools, which can puncture the fins and tubing.
Before, when alerted, during, after: an ice storm timeline
| When | Your home | Your pipes |
|---|---|---|
| Before winter (fall) | Have heating equipment and the chimney inspected; trim dead or overhanging limbs (hire an arborist near power lines); install battery CO alarms; seal drafty windows, which Ready.gov says account for about 30% of a home’s heating energy loss. | Drain and store hoses; close the inside shutoffs for hose bibs and leave the outside bibs open to drain; drain sprinkler and pool lines per the installer’s directions; insulate pipes in garages, attics, crawl spaces and under sinks; find and test your main water shutoff. |
| When a watch or warning is issued | Charge power banks and power stations; fill vehicles’ tanks; stock water and food; move cars away from big trees if you can; test your backup heat and generator outdoors. | Keep the garage door closed; open kitchen and bath cabinet doors on exterior walls; plug in heat cable on vulnerable runs; set the thermostat to the same temperature day and night. |
| During the storm | Stay off the roads. Keep generators outside, at least 20 feet from openings. Keep space heaters 3 feet from anything that can burn. Never use a grill, camp stove or oven for heat. | Let cold water drip from faucets fed by exposed pipes; even a trickle helps, per the Red Cross. If the power is out and the house is cooling, keep dripping and consider shutting off and draining the system if a long outage is expected. |
| After (the thaw) | Treat every downed line as live and report it to the utility. Photograph damage for insurance before cleanup. Remove hazardous broken limbs promptly. | Watch for leaks as pipes thaw: check ceilings, the basement and under sinks. Check every faucet; one frozen pipe often means others. |
How to thaw a frozen pipe safely
If you turn on a faucet and get only a trickle, suspect a frozen pipe. The Red Cross guidance:
- Open the faucet so water can flow as the ice melts; moving water helps thaw the rest.
- Apply gentle heat to the frozen section with an electric heating pad wrapped around the pipe, a hair dryer, a portable space heater kept away from flammable materials, or towels soaked in hot water.
- Never use an open flame: no blowtorch, kerosene or propane heater, or charcoal stove.
- Keep heating until full water pressure returns, then check the other faucets in the house.
- Call a licensed plumber if you can’t find the frozen section, can’t reach it, or can’t thaw it.
Likely freeze spots are pipes on exterior walls and where the water service enters through the foundation.
If a pipe bursts: the first 10 minutes
- Shut off the main water valve. It’s usually where the line enters the house, often near the water heater or meter. Everyone in the household should know where it is before winter.
- Kill power to wet areas at the breaker if water is near outlets, appliances or the electrical panel. Don’t stand in water to do it; call the utility or an electrician if you can’t reach the panel safely.
- Open the lowest faucets to drain the remaining water out of the system.
- Remove standing water with a wet/dry vac, towels and fans; start drying within hours to limit mold.
- Document everything with photos and video, then call a plumber and your insurer.
The math: why a small crack is a big deal
Water weighs about 8.34 pounds per gallon. Using State Farm’s figure for a 1/8-inch crack:
- 250 gallons × 8.34 lb ≈ 2,085 pounds of water a day
- Over a three-day trip: 750 gallons, or more than 6,000 pounds, soaking into floors, drywall and insulation
That’s why a leak sensor or an automatic shutoff valve is worth more than almost anything else on this list if you travel in winter.
Common mistakes
- Turning the heat way down overnight or while away. The Red Cross advises the same setting day and night, and no lower than 55°F if you leave.
- Leaving hoses connected. A connected hose traps water in the bib, where it can freeze and crack the pipe inside the wall.
- Thawing pipes with a torch. An open flame near framing and insulation can start a fire inside the wall; the Red Cross says never use one.
- Using non-listed heat tape, or wrapping it wrong. The Red Cross specifies UL-listed products; follow the manufacturer’s instructions exactly, including whether the cable can overlap itself or be covered by insulation.
- Running a generator in the garage “with the door open.” The CDC says never in a garage, basement or near windows.
- Not knowing where the main shutoff is until water is pouring through the ceiling.
- Assuming you’re safe in the South. Homes built for mild winters often have pipes in exterior walls and attics with little insulation. Texas topped State Farm’s frozen-pipe losses in 2022.
The 10 things worth stocking
1. Foam pipe insulation sleeves
Why: The Red Cross recommends insulating both hot and cold pipes in garages, attics, crawl spaces and under sinks. It’s the cheapest protection you can buy and takes an afternoon.
Look for: Sleeves sized to your pipe’s outside diameter, the thickest wall that fits the space, and self-sealing seams. Tape every joint and elbow, since gaps are where pipes freeze.
See pipe insulation on Amazon →
2. UL-listed heat cable for exposed pipes
Why: For pipes in crawl spaces, garages or mobile home skirting that insulation alone can’t protect, heat cable adds warmth when it’s needed.
Look for: A UL listing (the Red Cross specifically names UL-listed products), a built-in thermostat or self-regulating design, a length matched to your pipe run, and a GFCI-protected outlet to plug into. Install it exactly per the instructions.
3. Insulated outdoor faucet covers
Why: After you drain the hose bibs, a cover adds a layer of protection to the most exposed fitting on the house.
Look for: A rigid foam dome or thick insulated pouch with a snug strap or loop. Covers don’t replace draining; they’re backup.
4. Smart water leak and freeze sensors
Why: Small sensors under sinks, by the water heater and in the basement alert your phone to water on the floor or a falling temperature, so you can act before the thaw floods the house.
Look for: Both water and temperature alerts, a loud local alarm in case Wi-Fi is down, long battery life, and a hub or app that works with what you already use.
5. Automatic water shutoff valve
Why: A sensor tells you there’s a leak; a shutoff valve stops it. For second homes, frequent travelers and anyone with plumbing in an attic or over finished space, it’s the single best defense against a 250-gallon-a-day crack.
Look for: A valve that fits your main line size, works with leak sensors and closes automatically, has manual override, and has a battery backup. Some insurers offer discounts for these; ask yours. Most need a plumber to install.
See shutoff valves on Amazon →
6. Battery-powered carbon monoxide alarm
Why: The CDC tells households to install a battery-operated CO detector because outages lead people to run generators, heaters and grills where they shouldn’t. A plug-in alarm without a battery is useless when the power is out.
Look for: UL 2034 listing, a digital readout, a battery backup or sealed long-life battery, and one on every level and near sleeping areas.
7. Portable power station or generator
Why: Ice outages can last days. A power station runs a furnace blower (with proper wiring), sump pump, router, phones and lights silently indoors; a generator outdoors runs more for longer.
Look for: Enough capacity for your must-run loads (our sizing calculator does the math), pure sine wave output for furnace electronics, and for generators, CO shutoff and a transfer switch or inlet. See our power station picks and dual fuel generator picks.
See power stations on Amazon → See generators on Amazon →
8. Ice melt and traction grit
Why: The NWS points out that any amount of freezing rain creates serious slip-and-fall risk. Steps, the walk to the car and the path to the generator are where most ice storm injuries start.
Look for: The lowest effective temperature on the label (products vary widely), pet- and concrete-safe formulas if that matters to you, and a bag of sand or grit for traction when it’s too cold for melt to work. Add slip-on ice cleats for your boots.
See ice melt on Amazon → See ice cleats on Amazon →
9. NOAA weather radio
Why: Ice can damage cell towers and phone lines, according to the NWS. A weather radio keeps alerts and updates coming when your phone can’t.
Look for: NOAA Weather Radio with tone alert, battery plus hand-crank or solar charging, and a USB port to top up a phone.
See weather radios on Amazon →
10. Wet/dry shop vac
Why: If a pipe does burst, getting water off the floor in the first hours limits damage to flooring, drywall and insulation.
Look for: A tank big enough for real cleanup, a drain port so you don’t have to lift a full tank, and a foam filter for wet pickup. See our shop vac picks.
Ice storm and frozen pipe risks by region
| Region | Ice storm risk | Frozen pipe notes |
|---|---|---|
| Northeast (PA, NY, NJ, New England) | Highest in the country. One long-term study of 1949–2000 found an average of 5 to 7 freezing rain days a year; parts of eastern Pennsylvania, northwest New Jersey and eastern New York averaged 4 to 5 ice storms per winter in recent decades. | Older homes with pipes in exterior walls and unheated basements are vulnerable; outages after ice can last days. |
| Mid-Atlantic and Appalachians | Elevated, including the Chesapeake Bay region and the Virginia and North Carolina mountains. | Crawl spaces are common; insulate and seal vents during deep cold. |
| Upper Midwest | Frequent freezing rain, though often with fewer large losses than the Northeast. | Long, deep cold makes attic and garage pipes and second homes the big risks. |
| Southern Plains and South (OK, TX, AR, the Mid-South) | Less frequent but damaging when it happens; eastern Oklahoma stands out in ice storm records. | Homes often built with little pipe insulation. Texas led State Farm’s frozen-pipe losses in 2022. |
| Pacific Northwest | The Columbia River Basin in Washington and Oregon sees notable ice storms. | Mild climate means many pipes are unprotected when a cold snap hits. |
| Rockies and Southwest | Relatively few freezing rain days. | The threat is deep, sudden cold rather than ice. Colorado ranked fifth in State Farm’s 2022 frozen-pipe losses. |
Regional patterns come from studies summarized by the Southern Climate Impacts Planning Program (SCIPP).
FAQ
At what temperature do pipes freeze?
There’s no single number, because it depends on where the pipe is, how well it’s insulated and how long the cold lasts. Pipes in unheated spaces and on exterior walls can freeze during any hard freeze, especially with wind blowing on them. Start protecting exposed pipes whenever a hard freeze is forecast, and follow the Red Cross steps: insulate, open cabinet doors, keep the thermostat steady and drip faucets on exposed lines.
Should I drip my faucets during an ice storm?
Yes, for faucets fed by exposed pipes. The Red Cross says even a trickle of cold water helps prevent freezing, and the CDC also advises leaving taps slightly open so they drip continuously during extreme cold. If you’re on a well and expect a long outage, the pump won’t run, so plan to drain the system instead.
What temperature should I leave my thermostat on when I travel in winter?
The Red Cross says no lower than 55°F. A smart thermostat or a Wi-Fi temperature sensor lets you confirm from your phone that the heat is still running while you’re gone.
How long does an ice storm power outage last?
The NWS warns that major ice storms can cause widespread outages lasting several days, because crews have to clear fallen trees before they can repair lines. Plan for at least three days without power, and follow your utility and local emergency officials for restoration updates.
Related guides
- Disaster Prep hub: what to get ready for, season by season
- Winter Storm and Power Outage Prep: What to Stock Before the First Blizzard
- The Best Portable Power Stations for Home Backup
- The Best Dual Fuel Generators
- The Best Space Heaters
Sources
National Weather Service: Winter Weather Warnings, Watches and Advisories; National Weather Service (Baltimore/Washington): Identify Weather Threats: Ice; American Red Cross: Preventing and Thawing Frozen Pipes; CDC: Safety Guidelines During and After a Winter Storm; Ready.gov: #WinterReady; Connecticut DEEP Forestry: Ice Storms and Trees; Southern Climate Impacts Planning Program: Ice Storm Frequency; State Farm: Water and Ice, Not So Nice. Ice and water weights are standard physical values used for illustration. Always follow your local officials during an emergency.
Photos courtesy of Unsplash.