How to Prevent Frozen Pipes in Winter

Every winter, more than 250,000 American homes suffer burst pipes caused by freezing temperatures — generating an estimated $1 billion in property damage nationwide. The average insurance claim for frozen pipe damage runs between $5,000 and $70,000 once you factor in water damage, mold remediation, and structural repairs. The good news: frozen pipes are almost entirely preventable with the right preparation. This 2026 guide covers everything you need to know — from why pipes freeze to 10 proven prevention methods — so you can head into winter with total confidence.

1. Why Pipes Freeze and Burst

Water is unique among common liquids: when it freezes, it expands by roughly 9% in volume. Inside a sealed pipe, there is nowhere for that expanding ice to go — so the pressure builds until the pipe wall fails. The burst rarely happens at the exact point where the water froze; instead, the pressure spike travels through the pipe and the failure occurs wherever the wall is weakest, often at a joint, fitting, or corroded section.

Pipes typically begin to freeze when surrounding air temperatures drop below 20°F (-6°C) and remain there for six or more hours. At 0°F, the process can take as little as one to two hours. Wind-chill effects accelerate freezing dramatically — a 25°F night with a 20 mph wind can expose your plumbing to effective temperatures well below 0°F.

2. Which Pipes Are Most at Risk

Not all pipes in your home face equal risk. The ones most likely to freeze are those that run through spaces that aren't heated or that are exposed to outdoor air:

• Pipes in unheated areas — basements, crawl spaces, attics, garages, and storage rooms without insulation or heating
• Pipes in exterior walls — supply lines routed through wall cavities that face outdoors are particularly vulnerable in older, poorly insulated homes
• Outdoor hose bibs and irrigation lines — these have no interior heat source and often retain water if not properly drained before winter
• Pipes beneath kitchen and bathroom cabinets — cabinets on exterior walls block warm air from reaching the pipes behind them
• Swimming pool and sprinkler supply lines — long runs of pipe that are exposed to ground temperatures
• Pipes in vacation homes or properties left vacant — reduced thermostat settings mean the whole house may drop into the danger zone

Copper and steel pipes are more vulnerable to freeze damage than PEX (cross-linked polyethylene), but PEX is not immune — while it can flex somewhat as ice forms, severe freezes will still split PEX joints and fittings.

3. 10 Ways to Prevent Frozen Pipes

The following methods are ranked roughly from most to least impactful. Applying several in combination gives you the strongest protection.

1. Insulate Every Vulnerable Pipe

Pipe insulation is the single most effective long-term defense against frozen pipes. Foam pipe sleeves (available at any hardware store for $0.50–$2 per foot) slip directly over the pipe and create a thermal barrier that slows heat loss dramatically. For pipes in extremely cold areas — unheated garages, exterior walls — use thicker foam with a higher R-value, or wrap the pipe with fiberglass batt insulation and secure it with tape. Pay particular attention to the first six inches of pipe where it enters the building from outdoors; this is the most exposed section.

2. Keep Your Thermostat Above 55°F at All Times

Even when you're away on vacation, keep your home's thermostat set to at least 55°F (13°C). This is the minimum interior temperature needed to keep pipes in interior walls safe. Going lower than 55°F to save on heating bills is a false economy — a single burst pipe claim will dwarf years of heating savings. If you're leaving for more than a few days, ask a trusted neighbor to check the house daily in case the heating system fails.

3. Let Faucets Drip on Freezing Nights

Running water resists freezing far better than still water. On nights when temperatures are forecast to drop below 20°F, open cold-water faucets on exterior walls to a slow drip. This doesn't need to be a full flow — just enough movement to prevent ice from forming. Focus on faucets furthest from the main supply, since these sit at the ends of the longest pipe runs. A drip uses only about one gallon per hour, a small cost compared to the damage a frozen pipe can cause.

4. Open Cabinet Doors Under Sinks

Kitchen and bathroom cabinets on exterior walls trap cold air around the supply pipes inside them. On very cold nights, open those cabinet doors to allow warm room air to circulate around the pipes. It's a simple, zero-cost step that can make the difference on a night when temperatures plunge unexpectedly.

5. Disconnect and Drain Garden Hoses

Water left in a garden hose connected to an outdoor hose bib can freeze and push back into the pipe inside your home. Before the first freeze of the season, disconnect all garden hoses, drain them, and store them indoors. Even if your hose bib is a frost-free design (which has the shut-off mechanism recessed inside the wall), a connected hose can defeat that protection.

6. Shut Off and Drain Outdoor Hose Bibs

Locate the indoor shut-off valve that controls each outdoor hose bib — it's usually in the basement or crawl space near where the bib penetrates the wall. Shut off the indoor valve, then go outside and open the hose bib fully to let any remaining water drain out. Leave the bib open all winter to prevent pressure buildup. If your home doesn't have individual shut-off valves for hose bibs, install them — it's a straightforward job for a licensed plumber.

7. Insulate Your Crawl Space and Attic

Pipes running through uninsulated crawl spaces and attics are exposed to outdoor temperatures with minimal protection. Adding proper insulation to these spaces — spray foam, rigid foam board, or blown cellulose — keeps the ambient temperature above freezing and protects all the plumbing running through those areas simultaneously. This is a one-time investment with benefits that extend well beyond pipe protection (lower energy bills, better comfort year-round).

8. Seal Gaps and Air Leaks Near Pipes

Cold outside air can penetrate your home through gaps around electrical conduits, cable TV lines, dryer vents, and pipe penetrations through exterior walls. Each gap allows a stream of frigid air directly to your plumbing. Use caulk, spray foam, or weather stripping to seal these openings. Pay special attention to where pipes enter the home from outside — these are often improperly sealed in older properties.

9. Install Electric Heat Tape on High-Risk Pipes

For pipes in particularly exposed locations — unheated garages, a basement wall that can't be insulated properly — electric heat tape (also called heat cable) is an effective solution. The tape wraps around the pipe and produces a low level of heat that prevents freezing. Most modern heat tapes are thermostat-controlled and only activate when the pipe temperature drops near freezing, keeping operating costs low. Installation is DIY-friendly for accessible pipes but should be done carefully per the manufacturer's instructions to avoid fire risk.

10. Know Where Your Main Shut-Off Is — and Test It

This isn't a prevention measure in the traditional sense, but it's essential preparation. If a pipe does freeze and burst, being able to shut off the main water supply within seconds limits damage dramatically. Find your main shut-off valve right now, make sure every adult in your household knows where it is, and turn it a full cycle to confirm it still operates freely. A valve that hasn't been turned in years may seize — better to discover that now than at 2 a.m. in a flooding basement.

4. What to Do If Your Pipes Freeze

If you turn on a tap and get only a trickle — or nothing — during cold weather, you likely have a frozen pipe. Act immediately:

1. Keep the faucet open. As you begin to thaw the pipe, water and steam need somewhere to escape. An open faucet also lets you know when flow has been restored.
2. Locate the frozen section. Check pipes in unheated areas first — along exterior walls, under cabinets, in the basement or crawl space. A frozen pipe often feels unusually cold to the touch and may have visible frost on the outside.
3. Apply gentle heat. Use a hair dryer, a heating pad set to low, warm towels, or a portable space heater aimed at the frozen section. Work from the faucet end toward the blocked section so that melting ice has somewhere to drain. Never use an open flame — a propane torch or heat gun pointed at a pipe risks fire, pipe damage, and releasing toxic fumes from pipe coatings.
4. Check all other faucets. If one pipe froze, others in the same area may be frozen too. Run a quick check of all cold and hot taps in the house.
5. Inspect for cracks or splits. Once thawed, examine the affected pipe carefully for signs of damage. If the pipe has cracked — or if you can't locate or access the frozen section — call a licensed plumber immediately.

5. Emergency — What to Do When a Pipe Bursts

If a frozen pipe has already burst, you need to act fast. The first 10 minutes are critical:

• Shut off the main water supply immediately. Find the main valve and turn it clockwise until it stops. This is the single most important thing you can do.
• Turn off electricity in flooded areas. Water and electricity are deadly. If water is near any outlets, fixtures, or your electrical panel, shut off the relevant breakers before entering the area.
• Open all cold-water faucets to drain the remaining water from the pipes and reduce pressure.
• Document the damage with photos and video before you start cleaning up — this is essential for your insurance claim.
• Call a licensed emergency plumber straight away. Most plumbing companies offer 24/7 emergency response for exactly these situations.
• Contact your homeowner's insurance to report the claim as soon as you've dealt with the immediate emergency.

For a full step-by-step guide on handling a burst pipe, see our dedicated article: What to Do When a Pipe Bursts.

6. Cost of Frozen Pipe Damage vs. Prevention

One of the most compelling arguments for preventing frozen pipes is the stark difference in cost between prevention and repair:

Spending $200–$600 on insulation and heat tape this fall is one of the smartest home maintenance investments you can make. Even a single avoided pipe burst pays for those measures many times over.

7. Find a Plumber Before Winter Hits

The best time to winterize your plumbing is before the first freeze — not during it. A licensed plumber can inspect your entire system, identify the pipes most at risk, install proper insulation and shut-off valves, and give you a full picture of your home's vulnerabilities before temperatures plummet. Emergency plumbers are in extremely high demand during cold snaps, and response times can stretch to 24–48 hours. Scheduling a pre-winter inspection now means you get the work done on your schedule, not in a crisis.

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