How Snow and Ice Affect Your Home’s Radon Readings

November 17, 2025      

Winter brings more than just chilly air and frosty mornings—it can also change how radon behaves around your home. Many homeowners are surprised to learn that snow and ice can actually increase indoor radon levels, especially when temperatures drop and ventilation decreases.

When snow and ice cover the ground, they act like a seal, trapping radon gas beneath the surface. Normally, radon escapes from the soil and disperses into the open air, but when frozen ground or heavy snow prevents that release, the gas is forced to move elsewhere—often right into your home through cracks, foundation gaps, or sump pump openings.

At the same time, homes in winter are usually sealed tight to conserve heat. Closed windows, reduced airflow, and changes in indoor air pressure all make it easier for radon to accumulate indoors. Even small shifts in air movement or pressure differences between the basement and upper floors can cause radon levels to spike.

If you’ve noticed higher readings during the winter months, don’t panic—it’s a common seasonal pattern. However, it’s also an important reminder to stay proactive. Testing for radon during the colder season gives you a more accurate look at your home’s highest potential levels. If your readings rise above the recommended safety limit, it’s time to consider installing or servicing a radon mitigation system.

At The Radon Guys, we specialize in designing radon mitigation systems that work effectively year-round, even under tough winter conditions. Our team can help you test, monitor, and maintain your home’s air quality so you and your family stay safe through every season.

Don’t let snow and ice trap danger beneath your roof—contact The Radon Guys today for reliable radon mitigation you can trust.

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