{"id":2130,"date":"2026-09-19T08:00:00","date_gmt":"2026-09-19T13:00:00","guid":{"rendered":"https:\/\/radonresources.com\/blog\/?p=2130"},"modified":"2026-08-25T13:01:40","modified_gmt":"2026-08-25T18:01:40","slug":"radon-testing-in-winter-vs-summer-what-changes-and-what-to-expect","status":"publish","type":"post","link":"https:\/\/radonresources.com\/blog\/radon-testing-in-winter-vs-summer-what-changes-and-what-to-expect\/","title":{"rendered":"Radon Testing in Winter vs Summer: What Changes and What to Expect"},"content":{"rendered":"<p><strong>Radon Testing in Winter vs Summer: What Changes and What to Expect<\/strong><\/p>\n<p>Radon levels in most homes run higher in winter than in summer, so the season you test in affects the number you get. In cold weather a home is closed up and its heating system pulls air \u2014 and soil gas \u2014 upward through the foundation, which tends to push readings up. In summer, open windows and natural ventilation often dilute radon and can pull the same home&#8217;s reading down. Neither number is wrong. They&#8217;re both real snapshots of a level that moves with the weather, which is why a short-term test taken in July and one taken in January can disagree, and why a long-term test is the better way to learn what your home averages across a full year.<\/p>\n<p>This article explains why the seasons move radon, what to do differently when you test in winter versus summer, how to keep a short-term test valid in each season, and when it&#8217;s worth testing more than once.<\/p>\n<p><strong>Why radon changes with the seasons<\/strong><br \/>\nRadon is a naturally occurring radioactive gas that rises from soil and rock and collects inside homes. You can&#8217;t see or smell it, and long-term exposure is identified by the U.S. EPA as the second-leading cause of lung cancer in the United States. It&#8217;s measured in picocuries per liter (pCi\/L), and EPA recommends fixing a home at or above 4 pCi\/L and considering action between 2 and 4 pCi\/L. How much of it ends up indoors at any given moment depends heavily on the pressure difference between the soil under your home and the air inside, and that difference shifts with the season.<\/p>\n<p>The main driver in winter is the stack effect. Warm air inside a heated house rises and escapes through the upper levels, which lowers the air pressure near the foundation. That slight vacuum draws soil gas \u2014 radon included \u2014 in through cracks, joints, and openings more strongly than in mild weather. Homes are also closed up in winter, so once radon is inside there&#8217;s less fresh air trading in to dilute it. Frozen or snow-covered ground can add to the effect by capping the soil, so gas that would otherwise vent to open air is nudged toward the warmer, lower-pressure path your foundation offers.<\/p>\n<p>Summer tends to work in the other direction. The indoor-outdoor temperature gap shrinks, so the stack effect weakens. Open windows and doors ventilate the house, and that air exchange dilutes indoor radon. The result in a typical home is a lower reading in warm months, though this isn&#8217;t universal. A home that&#8217;s sealed up and air-conditioned all summer behaves more like a winter house, and heavy summer rain that saturates the ground can temporarily raise levels by blocking radon&#8217;s escape routes to the surface.<\/p>\n<p><strong>What a winter test looks like<\/strong><br \/>\nWinter is often considered a strong time to test because it tends to capture a home near its higher end. A short-term test run during the heating season, with the house naturally closed up, gives you a reading on the conservative side \u2014 if you&#8217;re below the action level under those conditions, you&#8217;re less likely to be surprised by a spike later. That&#8217;s the practical appeal of winter testing: it&#8217;s less likely to under-report.<\/p>\n<p>The closed-up conditions winter creates also line up neatly with how a short-term test is supposed to be run. For any short-term measurement, EPA&#8217;s protocols call for closed-house conditions, and for a test of four days or less the house should be closed for 12 hours before the test starts and kept closed throughout. In January, keeping windows and exterior doors shut is what you&#8217;re doing anyway, so meeting the protocol takes little effort.<\/p>\n<p>One thing to watch in winter is severe weather. Short-term tests of just two or three days shouldn&#8217;t be run during unusually high winds or major storms, because rapid pressure and wind changes can swing the reading. Winter delivers more of those events in much of the country, so if a big storm is forecast, it&#8217;s worth waiting for it to pass or choosing a slightly longer test window.<\/p>\n<p><strong>What a summer test looks like<\/strong><br \/>\nTesting in summer is perfectly valid, but it asks for more discipline to keep the result meaningful. The habits that make summer comfortable \u2014 open windows, a screen door, a whole-house fan \u2014 are exactly the things that break the closed-house conditions a short-term test needs. If you test in warm weather, you still have to close the windows and exterior doors for 12 hours beforehand and keep them closed during the test, running the air conditioner instead of opening up. Skipping that step doesn&#8217;t give you a &#8220;summer reading&#8221;; it gives you an invalid one.<\/p>\n<p>Even done correctly, a summer short-term test may land lower than the same home would read in winter, so a result comfortably under 4 pCi\/L in July deserves a little caution. It tells you the home is likely fine in its most ventilated season, but not necessarily where it sits in January. If a summer test comes back close to the action level, that&#8217;s a strong reason to retest in colder weather, when levels usually climb.<\/p>\n<p>Short-term versus long-term testing across the seasons<br \/>\nThe reason a single test can mislead is that radon varies from day to day and season to season. A short-term test \u2014 anywhere from 2 to 90 days \u2014 is a snapshot of whatever conditions happened to prevail while the detector was out. That&#8217;s useful for a quick answer or a real-estate timeline, but it&#8217;s tied to that season.<\/p>\n<p>A long-term test, meaning more than 90 days, sidesteps the seasonal problem by averaging across it. Because it runs through changing weather, a long-term measurement is more likely to reflect your home&#8217;s true year-round average than any short-term test. If you want the number that best represents ordinary life in the home rather than one season of it, a long-term test placed so it spans both heating and non-heating months is the most reliable choice.<\/p>\n<p>A common and sensible pattern is to start with a short-term test for a fast read, then confirm with a long-term test, or with a second short-term test in the opposite season. If your first test was in summer, a winter follow-up rounds out the picture; if you tested in winter and landed near the line, a longer test tells you whether the winter number was a peak or the norm. Our guides to radon testing and radon test kits cover how to choose between short- and long-term devices and run each one correctly.<\/p>\n<p><strong>Practical takeaways by season<\/strong><br \/>\nTesting in winter: A good time to catch a home near its high point. Closed-house conditions are easy to maintain, but avoid starting a short two-to-three-day test right before a major storm or high winds.<br \/>\nTesting in summer: Fine to do, but close windows and exterior doors for 12 hours before and throughout the test, and use air conditioning rather than open ventilation. Treat a borderline summer result as a reason to retest when it&#8217;s cold.<\/p>\n<p>Either season, borderline result: If a short-term test lands anywhere near 2 to 4 pCi\/L, follow up \u2014 ideally with a long-term test or a test in the opposite season \u2014 before deciding.<br \/>\nThe most representative number: A long-term test spanning both heating and non-heating months best reflects your year-round average.<\/p>\n<p>After mitigation: Retest to confirm the system is holding your level down, and keep testing periodically since levels drift over time.<\/p>\n<p><strong>Frequently asked questions<\/strong><br \/>\nIs winter really the best time to test for radon?<br \/>\nIt&#8217;s a strong time, because closed-up homes and the winter stack effect tend to produce readings near the home&#8217;s higher end, so a passing winter result is reassuring. It also makes the required closed-house conditions easy to keep. But you can test any time of year as long as you follow the protocol, and a long-term test that spans seasons is more representative than any single winter test.<\/p>\n<p><strong>Are radon levels always lower in summer?<\/strong><br \/>\nUsually, but not always. Summer ventilation and a smaller indoor-outdoor temperature difference tend to dilute radon and lower readings. A home that stays sealed and air-conditioned all summer can behave like a winter home, and heavy rain that saturates the ground can push levels up temporarily. That&#8217;s why a summer test still requires closed-house conditions to be valid.<\/p>\n<p><strong>Can I trust a summer radon test?<\/strong><br \/>\nYes, if it&#8217;s run correctly: windows and exterior doors closed for 12 hours before and during the test, with air conditioning instead of open windows. A valid summer test that comes back well below 4 pCi\/L is meaningful. If it lands close to the action level, retest in colder weather, since levels typically rise in winter.<\/p>\n<p>My summer and winter tests disagree. Which one is right?<br \/>\nBoth can be accurate snapshots of different conditions. Radon naturally varies from day to day and season to season, so a gap between a summer and winter reading is expected rather than a sign that one test failed. To settle it, run a long-term test of more than 90 days; its average across seasons is the best single indicator of your year-round exposure.<\/p>\n<p><strong>What this means for testing your home<\/strong><br \/>\nSeason doesn&#8217;t decide whether you should test \u2014 it shapes what the result means. A winter test tends to show your home near its peak and is easy to run correctly; a summer test is just as valid but demands closed-house discipline and a bit more caution with a borderline number. If you want the truest picture, let a long-term test average the seasons for you, and retest after any mitigation to confirm it worked. To find a certified professional who can test your home or interpret a seasonal result, request a free quote and connect with a radon specialist in your area. You can also see radon readings homeowners have reported near you to get a sense of local levels.<\/p>\n<p>Sources and further reading<br \/>\nU.S. Environmental Protection Agency, A Citizen&#8217;s Guide to Radon<br \/>\nU.S. Environmental Protection Agency, Protocols for Radon and Radon Decay Product Measurements in Homes<br \/>\nU.S. Environmental Protection Agency, Radon Standards of Practice<br \/>\nNational Radon Program Services (Kansas State University), Testing Protocols<br \/>\nU.S. Environmental Protection Agency, Health Risk of Radon<br \/>\nThis article is for general educational purposes and is not medical advice. Long-term radon exposure is associated with an increased risk of lung cancer, but individual risk depends on many factors. Reducing elevated radon can lower future exposure; it cannot undo exposure already received. For guidance on testing your home, consult a certified radon professional, and for health questions consult a qualified medical provider.<\/p>\n<div class=\"22ed2311db4594d186c610eb4750f4e6\" data-index=\"2\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<a href=\"https:\/\/radonresources.com\/glp.php?camp=bc1\"><img decoding=\"async\" src=\"https:\/\/radonresources.com\/blog\/wp-content\/uploads\/2017\/02\/RR-Magnet-Lead-Image.jpg\" alt=\"RR lead magnet\"><\/a>\n<\/div>\n\n<div style=\"font-size: 0px; height: 0px; line-height: 0px; margin: 0; padding: 0; clear: both;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Radon Testing in Winter vs Summer: What Changes and What to Expect Radon levels in most homes run higher in winter than in summer, so the season you test in affects the number you get. In cold weather a home is closed up and its heating system pulls air \u2014 and soil gas \u2014 upward [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2131,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-2130","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Radon Testing in Winter vs Summer: What Changes and What to Expect - Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/radonresources.com\/blog\/radon-testing-in-winter-vs-summer-what-changes-and-what-to-expect\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Radon Testing in Winter vs Summer: What Changes and What to Expect - Blog\" \/>\n<meta property=\"og:description\" content=\"Radon Testing in Winter vs Summer: What Changes and What to Expect Radon levels in most homes run higher in winter than in summer, so the season you test in affects the number you get. 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