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At What Temperature Do Pipes Start to Freeze?

Last updated October 26, 2026

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The short answer

The Freezing Point

Water freezes at 32 degrees Fahrenheit, but pipes usually do not freeze until the surrounding air temperature stays below that for several hours. In practice, most pipes start to freeze when the outdoor temperature falls to around 20 degrees Fahrenheit, particularly if they are in unheated basements, attics, or exterior walls.

Wind chill can lower the effective temperature around exposed pipes, causing them to freeze even when the air is slightly above 20 degrees. The exact threshold depends on pipe material, insulation, and how long the cold lasts. If you live in Cincinnati, keep an eye on the forecast and protect vulnerable pipes before a hard freeze.

Why Pipes Burst

When water freezes inside a pipe, it expands by about 9 percent. That expansion can crack the pipe, even if the ice is just a small plug. The bigger problem happens after the ice thaws: water rushes through the damaged pipe, causing flooding and water damage.

Burst pipes are a common cause of water damage in winter. If a pipe bursts, you may face soaked drywall, flooring, and personal belongings. Acting quickly to shut off the water and dry the area can limit the damage, but professional help is often needed for thorough cleanup.

  • Insulate exposed pipes with foam sleeves or heat tape
  • Keep garage doors closed if water lines run through the garage
  • Open cabinet doors under sinks to let warm air circulate
  • Let a trickle of water run from faucets during extreme cold
  • Keep your thermostat set to at least 55 degrees when away
  • Know where your main shutoff valve is located

What to Do If a Pipe Bursts

If a pipe bursts, the first step is to shut off the main water valve to stop the flow. Then, turn off the electricity in the affected area if water is near outlets or appliances. Remove as much water as you can with towels or a wet vacuum to prevent further damage.

Once the immediate water is controlled, assess the situation. A plumber can repair the broken pipe, but water damage cleanup is a separate task. You may need to remove soaked carpet, drywall, or flooring to prevent mold growth. Local water damage pros can handle the drying and restoration process.

Preventing Future Freezes

Prevention is simpler than cleanup. Insulating pipes in unheated areas is one of the most effective steps. You can buy foam pipe insulation at a hardware store and slip it over exposed sections. Sealing gaps in walls and around pipes also helps keep cold air away.

During a cold snap, keep your home heated, even if you are away. Opening cabinet doors under sinks exposes the pipes to warm indoor air. If you have a vacant property, consider draining the water system completely. These measures can spare you the hassle of a burst pipe.

When to Call for Help

If you discover a burst pipe, you do not have to handle the cleanup alone. Water damage can seep into walls, floors, and ceilings, leading to structural issues and mold. Professional restoration involves drying, sanitizing, and repairing affected areas.

Local water damage pros use industrial equipment to dry out your home and prevent secondary damage. They can also remove water-damaged materials and restore your space. If you live in Cincinnati, keep the number of a trusted water damage service handy before an emergency happens.

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Frequently asked questions

At what temperature do pipes freeze in a house?

Pipes inside a house typically freeze when the outdoor temperature drops to about 20 degrees Fahrenheit, especially if they are in unheated areas like basements or attics. Keeping your home heated to at least 55 degrees can help prevent freezing.

How long does it take for pipes to freeze at 20 degrees?

It can take several hours of sustained cold for pipes to freeze, often around 6 to 8 hours if the temperature stays at 20 degrees. The exact time depends on insulation, pipe location, and drafts. Acting quickly to protect pipes is important.

Should I let my faucets drip to prevent freezing?

Yes, letting a trickle of water run from faucets can help prevent freezing. Moving water is less likely to freeze, and the flow relieves pressure if ice does form. This is especially helpful during extreme cold spells.

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