Can Toilets Freeze in Cold Weather? What You Need to Know

Freezing weather could mean frozen pipes

Gray tiles installed on the wall and floor of the bathroom
Photo: ben-bryant / iStock / Getty Images Plus / Getty Images
Gray tiles installed on the wall and floor of the bathroom
Photo: ben-bryant / iStock / Getty Images Plus / Getty Images
Stephanie Mickelson
Written by Stephanie Mickelson
Contributing Writer
Updated Sep 3, 2024
Highlights

  • Toilet pipes can freeze if they’re exposed to temperatures below 32 degrees Fahrenheit.

  • If your toilet pipes freeze, you may need to call a plumber to help thaw them out and check for cracked pipes.

  • To keep toilet pipes from freezing in the winter, you can take preventative measures to protect them from the cold.

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If the weather outside is frightful, a frozen toilet can make it even worse. But can toilets freeze in cold weather? The answer to this is yes, however, it's not the actual toilet that freezes but rather the plumbing lines leading to and from the toilet. Here’s why toilets freeze in cold weather and what you can do to thaw it out and prevent it from happening again. 

Why Do Toilets Freeze in Cold Weather

Cold weather doesn’t necessarily mean frozen pipes. Pipes can freeze if they’re exposed to temperatures 32 degrees Fahrenheit or lower. The pipe itself offers some insulation from the cold, and insulated pipes can keep the water inside a little bit warmer. This reduces the likelihood the water inside will freeze as soon as the external temperature reaches 32 degrees, but the chances increase as the temperature drops.

Average winter temperature risk of freezing pipes map, with Louisiana, Florida, and Hawaii being very low risk
Image: PeterHermesFurian / iStock / Getty Images Plus / Getty Images

Toilets have two plumbing lines, the supply line that comes from the wall and supplies fresh water for flushing and the drain line that carries away waste—both can freeze in the cold weather. Toilets are especially susceptible to frozen pipes if the plumbing is in exterior walls, unheated basements, or crawl spaces that are colder than the main living spaces.

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What to Do If Toilet Pipes Freeze

First, you have to learn how to tell if pipes are frozen. For a toilet, this may mean that it won’t flush or refill, and you may see frost or condensation on the pipes. If you can access the pipes, you can also tap on them to see if they sound solid.

If you realize you have frozen toilet pipes, you might be able to thaw them yourself, but only if you have access to them. In many cases, toilet plumbing is inside the wall and will require a plumber’s help to thaw out. If you can see the toilet pipes in the basement or a crawl space, you can try the following to get them flowing again:

  • Use a hair dryer to blow warm air and thaw them or wrap a heating pad, hot towels, or heating tape around the pipe.

  • Place a space heater near the pipes—this works best in small spaces.

  • Pour warm water into the toilet bowl or tank and flush it to clear a frozen drain pipe.

Angi Tip

Thawing a frozen pipe before it bursts is crucial. We recommend contacting a plumber to ensure your pipes are thawed effectively. If a pipe were to burst, it would likely require an expensive repair.

Ryan Noonan
Ryan Noonan
Content Editor, Angi

How to Keep Pipes From Freezing

In cold weather, rather than dealing with a frozen toilet, it’s best to know how to keep pipes from freezing in the first place. Certain fixes for faucets, like dripping or covering an outdoor faucet, won’t work on toilets, so you have to try other methods. It will take some effort on your part to manage the temperature in your home and keep a vigilant eye on the daily forecast, but these precautions can help prevent bigger issues, like a burst pipe.  

  • Hire a local plumber to add insulation to the pipes inside the wall or otherwise winterize your toilet’s pipes.

  • Maintain a steady temperature inside the home throughout the winter even if you’ll be away on vacation or for an extended period of time.

  • Wrap exposed pipes with foam insulation or heating cables.

  • Add insulation to the area around the pipes.

Frequently Asked Questions

Just as frozen pipes can cause a blocked sink that won’t drain, frozen toilet pipes can block water from flushing down the drain pipe and prevent the tank from refilling, depending on which lines are frozen. To clear a frozen drain pipe, you can fill the toilet tank or bowl with warm water and flush, allowing the water to thaw the pipe as it rushes through.

It is safe to flush the toilet even if the pipes are frozen, and this may even help clear out the pipes. But if the supply line is frozen, the toilet won’t refill itself until it’s thawed out. You can still flush by pouring water into the tank to refill it.

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Learn more about our contributor
Stephanie Mickelson
Written by Stephanie Mickelson
Contributing Writer
Stephanie Mickelson is a freelance writer covering home improvement, real estate, design, and personal finance. Before beginning her freelance career, she worked in residential construction, specifically remodeling kitchens, installing cabinets, flooring, countertops, trim, and more.

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