Does Cold Weather Affect Radon Levels in the Home?

Russell Monges • May 11, 2026
Does Cold Weather Affect Radon Levels in the Home?

You might have heard of radon and just how dangerous it can be. Radon is something to be concerned about all year long, but you may want to pay special attention to this potential issue during the winter months. This guide will help you understand a little more about how radon can impact you and your family during the winter and what you can do about it.


How Cold Weather Can Affect Radon Levels in the Home

Radon levels can fluctuate in the home during different times of the year. You may find that radon levels are highest in your home during the winter months. These are some of the reasons that this is true:


  • Ventilation helps with reducing radon levels in the home. If you keep your windows open during the summer to allow a nice breeze to flow into your home, you could be mitigating radon levels without even realizing it. During the winter, though, many homeowners keep their windows closed because of the cold temperatures, which can cause radon levels to rise.
  • During the winter months, your area might be affected by a lot of rain, snow and ice. All of this added moisture can saturate and even freeze the soil. If this happens, radon cannot naturally flow into the atmosphere. The radon can then be redirected into your home in higher concentrations than usual.
  • Warm air can escape from your home during the winter through cracks and imperfections in the home. A stack effect can occur, allowing radon into your home. This can be a particularly common issue during the winter, when you are running your home heating system.

Because of these factors, there is a possibility that radon could be an issue in your home during the winter, even if you have never had to worry about dangerous levels of radon in the past.

Snow-covered suburban house with white siding, large windows, and bushes buried in snow.

Why You Should Perform a Radon Check During the Winter

Radon testing should be done in the home twice a year. If you have not had your home tested for radon lately, now is the time to do it. Although you can test your home’s radon levels at any time during the year, you will probably want to perform at least one of your twice-a-year tests during the winter months.


You can purchase an at-home test and perform radon testing on your own. Make sure that you buy a reliable test from a reputable supplier. Follow the instructions on the test carefully for accurate results. You can make things easier for yourself and can ensure that you get accurate results by opting for professional radon testing. Plus, if your test shows that the radon levels in your home are dangerous, the same professional who performs your testing can talk to you about your mitigation options.

Family sitting on grass outside a house, smiling at the camera.

How to Protect Your Home and Family from Radon

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