{"id":25095483,"date":"2026-06-21T08:40:51","date_gmt":"2026-06-21T06:40:51","guid":{"rendered":"https:\/\/pestpatrol.be\/2026\/06\/21\/ou-vont-les-insectes-en-hiver-le-guide-complet-de-leur-survie\/"},"modified":"2026-06-21T08:40:51","modified_gmt":"2026-06-21T06:40:51","slug":"where-do-insects-go-in-winter-the-complete-guide-to-their-survival","status":"publish","type":"post","link":"https:\/\/pestpatrol.be\/en\/2026\/06\/21\/ou-vont-les-insectes-en-hiver-le-guide-complet-de-leur-survie\/","title":{"rendered":"Where Do Insects Go in Winter? The Complete Guide to Their Survival"},"content":{"rendered":"<h1>Where Do Insects Go in Winter? Survival Secrets and Hiding Places<\/h1>\n<h3 id=\"sommaire\">Contents<\/h3>\n<ul>\n<li>\n<p><a target=\"_blank\" rel=\"noopener noreferrer nofollow\" class=\"text-primary underline toc-link\" href=\"#les-mecanismes-biologiques-de-survie-diapause-migration-et-antigel-naturel\">Biological Survival Mechanisms: Diapause, Migration, and Natural Antifreeze<\/a><\/p>\n<\/li>\n<li>\n<p><a target=\"_blank\" rel=\"noopener noreferrer nofollow\" class=\"text-primary underline toc-link\" href=\"#les-cachettes-strategiques-ou-se-cachent-ils-dans-la-nature-et-vos-maisons\">Strategic Hiding Places: Where Do They Hide in Nature and in Your Homes?<\/a><\/p>\n<\/li>\n<li>\n<p><a target=\"_blank\" rel=\"noopener noreferrer nofollow\" class=\"text-primary underline toc-link\" href=\"#cycles-de-vie-et-formes-d-hivernage-de-l-uf-a-l-adulte-face-au-froid\">Life Cycles and Hibernation Patterns: From Egg to Adult in Cold Conditions<\/a><\/p>\n<\/li>\n<li>\n<p><a target=\"_blank\" rel=\"noopener noreferrer nofollow\" class=\"text-primary underline toc-link\" href=\"#conclusion\">Conclusion<\/a><\/p>\n<\/li>\n<\/ul>\n<p>Every fall, it\u2019s the same story: the buzzing dies down, the flies disappear from the windows, and the mosquitoes stop waking you up at three in the morning. You might think that insects simply die off when the weather gets cold. The reality is much more surprising. Billions of arthropods are still there, all around you\u2014sometimes literally inside your walls\u2014waiting for warmer days to return, thanks to survival strategies perfected over millions of years of evolution.<\/p>\n<h3 id=\"ce-qu-il-faut-retenir\">Things to remember<\/h3>\n<ul>\n<li>\n<p>\"Pest Patrol\" explores the fascinating biological mechanisms and strategic hiding places of insects during a freeze<\/p>\n<\/li>\n<li>\n<p>We analyze scientific processes such as diapause and the use of glycerol, while precisely identifying their hiding places\u2014from natural habitats to the nooks and crannies of our homes\u2014to demonstrate our technical expertise.<\/p>\n<\/li>\n<li>\n<p>Diapause, migration, and natural antifreeze<\/p>\n<\/li>\n<li>\n<p>Where do they hide in nature and in your homes?<\/p>\n<\/li>\n<\/ul>\n<p>At Pest Patrol, we\u2019re interested in this question for a very practical reason: understanding where insects go in the winter also means understanding why some of them reappear in your home as soon as spring arrives\u2014sometimes in large numbers. Knowing what happens during the cold season allows us to anticipate problems, identify risks, and, when necessary, take action at the right time. So, let\u2019s take a closer look at what science tells us about how insects survive the cold.<\/p>\n<h2 id=\"les-mecanismes-biologiques-de-survie-diapause-migration-et-antigel-naturel\">Biological Survival Mechanisms: Diapause, Migration, and Natural Antifreeze<\/h2>\n<p>Here\u2019s a figure to put the issue into perspective: it\u2019s estimated that there are about 10 quintillion living insects on Earth at any given moment. Where do they all go when temperatures drop below zero? The answer lies in three main biological strategies, and the most fascinating is undoubtedly diapause.<\/p>\n<p><img decoding=\"async\" class=\"max-w-full h-auto rounded-md\" src=\"https:\/\/nghaeknymynesecnqcmd.supabase.co\/storage\/v1\/object\/public\/article-images\/article-1782023361996-ou-vont-les-insectes-en-hiver-le-guide-complet-de-leur-survie.png\" alt=\"Where Do Insects Go in Winter? The Complete Guide to Their Survival\"><\/p>\n<p>Diapause is a genetically programmed state of dormancy. Note that this is not simply hibernation as we understand it in the case of a bear or a hedgehog. Hibernation in insects is a metabolic slowdown triggered directly by cold. Diapause, on the other hand, is triggered <em>before<\/em> the onset of cold weather, often in response to shorter days (the photoperiod). The insect does not react to frost\u2014it anticipates it. Its metabolism drops drastically, sometimes to less than 10 % of its normal activity. The heart rate slows, oxygen consumption plummets, and growth stops. It is a remarkably effective state of biological suspension. A study published in the <em>Journal of Insect Physiology<\/em> has shown that certain species in diapause can survive for several months without eating, drawing on lipid reserves accumulated in the fall.<\/p>\n<p>So why aren't there any insects in winter, if so many of them are still alive? Because they're in diapause\u2014they don't move. They don't fly, they don't look for food, and they don't reproduce. They're invisible.<\/p>\n<p>The second mechanism is chemical, and it\u2019s amazing. Many insects produce glycerol, a natural cryoprotectant that works exactly like the antifreeze in your car. Glycerol lowers the freezing point of bodily fluids. Some species, such as the corn earworm, can accumulate glycerol concentrations of up to 25 % of their body weight. As a result, their cells do not freeze, even at -20 \u00b0C. Other insects use antifreeze proteins (called AFPs, for <em>antifreeze proteins<\/em>) that prevent the formation of ice crystals in tissues. Canadian researcher Brent Sinclair, from the University of Western Ontario, has extensively documented these mechanisms and shown that certain Arctic beetles survive temperatures as low as -60 \u00b0C thanks to this combination of glycerol and antifreeze proteins.<\/p>\n<p>Third strategy: migration. Monarch butterflies in North America travel up to 4,000 km to reach Mexico. In Europe, the painted lady (<em>Vanessa cardui<\/em>) migrates to North Africa. It\u2019s spectacular, but it\u2019s still a minority. The vast majority of insects do not migrate: they stay put and endure the cold.<\/p>\n<p>We should also mention a category that is often overlooked: insects that remain active in winter. Which insects are active in winter? Springtails, for example\u2014tiny arthropods sometimes called \u00absnow fleas\u00bb\u2014move across the surface of the snow in mild weather. Certain species of midges and crane flies still fly at temperatures close to 0 \u00b0C. These are not isolated exceptions: a Finnish study identified more than 300 species of insects active in the middle of the boreal winter.<\/p>\n<h2 id=\"les-cachettes-strategiques-ou-se-cachent-ils-dans-la-nature-et-vos-maisons\">Strategic Hiding Places: Where Do They Hide in Nature and in Your Homes?<\/h2>\n<p>Knowledge <em>how<\/em> Insects survive the cold\u2014that's one thing. Knowing <em>where<\/em> They're hiding\u2014and that's what really interests us at Pest Patrol, because that's where the issue directly affects your daily life.<\/p>\n<p>In nature, the first refuge is the ground. Forest litter (dead leaves, twigs, decomposing humus) forms a remarkable insulating layer. Under 10 cm of leaf litter, the temperature often stays above 0 \u00b0C even when it\u2019s -15 \u00b0C at the surface. Thousands of species spend the winter there: beetles, ants, spiders, and woodlice. It\u2019s a true natural thermal blanket. Tree bark plays a similar role. Lift a piece of bark in January: you\u2019ll almost always find insects underneath, sometimes entire colonies of ladybugs huddled together to stay warm. Rotten stumps, piles of wood, and rocky crevices\u2014all these microhabitats serve as winter refuges.<\/p>\n<p>Water, too, provides shelter. The larvae of dragonflies, mayflies, and many dipterans spend the winter at the bottom of ponds and streams. The temperature there rarely drops below 4 \u00b0C, even when the surface is frozen. It is a stable and protected environment.<\/p>\n<p>And what about your homes? What kinds of insects find their way indoors during the winter? The list is longer than you might think. Attics are a prime spot: relatively constant temperature, few disturbances, and easy access through gaps in the roof. Queen wasps regularly overwinter there. Cluster flies (<em>Pollenia rudis<\/em>) sometimes gather there by the hundreds or even thousands in attics and false ceilings. The devilish bedbugs (<em>Halyomorpha halys<\/em>), an invasive species that is rapidly spreading in France, love to slip behind shutters, into window frames, and even into the folds of curtains.<\/p>\n<p>Paradoxically, your home\u2019s insulation is both your ally and theirs. A well-insulated home maintains a mild indoor temperature\u2014exactly what insects seeking shelter are looking for. The spaces between walls and insulation, electrical conduits, and roller-shutter casings: these are all hidden pathways that insects take advantage of. German cockroaches are frequently found in the utility shafts of buildings, where they remain active year-round thanks to residual heat.<\/p>\n<p>Food moths pose a specific problem in winter. Contrary to what one might think, they do not disappear when it gets cold. In a heated kitchen, food moths continue their reproductive cycle uninterrupted. Cupboards, grain stores, open bags of flour\u2014central heating provides them with a permanent spring. That\u2019s why moth infestations in winter come as a surprise to many people. There\u2019s no reason for them to stop when the room temperature stays between 18 and 22 \u00b0C.<\/p>\n<p>A question we\u2019re often asked: Which insects bite in the winter? Fleas, for starters. If your pet has fleas, the heat in your home allows them to complete their life cycle continuously. Bed bugs, of course, are completely unaffected by the seasons since they live in our bedrooms. And in some regions, mosquitoes of the genus <em>Culex<\/em> They spend the winter in basements and garages, ready to strike as soon as the weather warms up.<\/p>\n<h2 id=\"cycles-de-vie-et-formes-d-hivernage-de-l-uf-a-l-adulte-face-au-froid\">Life Cycles and Hibernation Patterns: From Egg to Adult in Cold Conditions<\/h2>\n<p>Not all insects overwinter in the same form. This is a key point for understanding what actually happens during the cold season, and it is also what makes winter pest control so unique.<\/p>\n<p>Arthropods go through different stages of development during their lifetime: egg, larva (or nymph, depending on the type of metamorphosis), and adult. Over the course of evolution, each species has \u00abchosen\u00bb the stage that is most resistant to cold. This choice is significant: it determines the form in which the insect is most vulnerable\u2014or, conversely, the hardest to eliminate.<\/p>\n<p>Many species overwinter as eggs. This is the most extreme strategy: the adults die in the fall after laying their eggs, and it is the eggs that survive the winter. Praying mantises, for example, lay their oothecae (these hardened, spongy egg cases) on branches or walls in late summer. Inside, several hundred eggs are protected from frost by this insulating shell. Aphids lay winter eggs on the buds of fruit trees. These eggs are tiny, almost invisible, and extremely resilient. When spring arrives, they hatch almost simultaneously, which explains the population explosions observed in April and May.<\/p>\n<p>Other species spend the winter in the larval stage. Winter larvae are more common than one might think. May beetle larvae live in the soil for two to three years, surviving several successive winters by feeding on roots. Pine processionary caterpillars descend from their nests in winter to burrow into the soil and complete their development there. The larvae of many wood-boring beetles (longhorn beetles, wood borers) continue to bore into the wood of your roof structure even in January, as long as the wood\u2019s temperature remains above 10\u201312 \u00b0C. This is a detail that many homeowners are unaware of: the gnawing noise in the beams does not necessarily stop in winter.<\/p>\n<p>The nymph stage is also a common form of overwintering. The nymphs of many butterflies (chrysalises) are designed to withstand freezing temperatures. The swallowtail pupa, for example, can spend the entire winter clinging to a stem, exposed to the elements, and emerge perfectly in the spring. The structure of the chrysalis provides effective mechanical and thermal protection.<\/p>\n<p>Some insects overwinter as adults, and these are often the ones we find in our homes. Ladybugs gather in clusters of tens or hundreds in the cracks of buildings. Wasp and hornet queens, fertilized in the fall, spend the winter alone in a sheltered spot before founding a new colony in the spring. Brimstone butterflies (<em>Gonepteryx rhamni<\/em>) overwinter in ivy or piles of leaves, their wings folded to resemble a dead leaf.<\/p>\n<p>The key takeaway from all this is that insects\u2019 survival in the cold isn\u2019t a matter of luck. It\u2019s a precise system, fine-tuned by evolution, in which each species exploits the developmental stage and microhabitat that give it the best chance of survival. For us, pest control professionals, this means that a winter treatment must target the right life stage in the right place. Treating adults when the problem stems from eggs hidden in a crack is a waste of time.<\/p>\n<h2 id=\"conclusion\">Conclusion<\/h2>\n<p>Insects don\u2019t disappear in winter. They hide, slow down, transform, and wait. Diapause, glycerol, choosing the optimal stage of development: their survival strategies are incredibly effective. And their favorite hiding places are often our homes, our attics, and our closets.<\/p>\n<p>If you notice insects in your home in the middle of winter\u2014moths in the flour, flies in the attic, or noises in the rafters\u2014it\u2019s no coincidence. It\u2019s a sign that your home offers exactly what they\u2019re looking for: warmth, shelter, and food. At Pest Patrol, we recommend taking advantage of the cold season to inspect high-risk areas (attics, basements, window frames, food storage areas) and take action before spring triggers a general awakening. It\u2019s better to tackle a problem while the pest is dormant than when it\u2019s at the height of its activity.<\/p>\n<h2 id=\"questions-frequentes\">Frequently asked questions<\/h2>\n<details class=\"faq-item\">\n<summary>Do all insects die in the winter because of the cold?<\/summary>\n<p>No, most insects do not die; they enter diapause, a state of biological dormancy that slows their metabolism to less than 10 %. To survive the freeze, many also produce glycerol, a natural antifreeze that prevents their cells from freezing.<\/p>\n<\/details>\n<details class=\"faq-item\">\n<summary>Which insects remain active and come into our homes in the winter?<\/summary>\n<p>In a heated home, food moths and bed bugs remain active and continue to reproduce year-round. Attics and drop ceilings also harbor wasp queens, cluster flies, and devil bugs seeking a warm place to hide.<\/p>\n<\/details>\n<details class=\"faq-item\">\n<summary>Where do insects hide in nature during the cold season?<\/summary>\n<p>The main natural shelter remains the ground, beneath a layer of fallen leaves and humus, which provide excellent thermal insulation. In winter, insects can also be found hiding under tree bark, in rotten stumps, or buried in the mud at the bottom of ponds.<\/p>\n<\/details>\n<details class=\"faq-item\">\n<summary>In what form do insects survive the winter?<\/summary>\n<p>Each species overwinters in its most resilient form: praying mantises and aphids spend the winter as eggs, butterflies as chrysalises (nymphs), and wood-boring insects such as woodworms remain in the larval stage deep within the wood.<\/p>\n<\/details>\n<details class=\"faq-item\">\n<summary>Which insects bite indoors during the winter?<\/summary>\n<p>Bed bugs remain the number one pest in winter, as they take advantage of the constant warmth in our bedrooms. Fleas from our pets also continue their life cycle, while some mosquitoes overwinter in basements and become active at the first sign of warmer weather.<\/p>\n<\/details>","protected":false},"excerpt":{"rendered":"<p>Where Do Insects Go in Winter? Survival Secrets and Hiding PlacesTable of ContentsBiological Survival Mechanisms: Diapause, Migration, and Natural AntifreezeStrategic Hiding Places: Where Do They Hide in the\u2026<\/p>","protected":false},"author":2,"featured_media":25095482,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[1],"tags":[],"dipi_cpt_category":[],"class_list":["post-25095483","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-non-classe"],"_links":{"self":[{"href":"https:\/\/pestpatrol.be\/en\/wp-json\/wp\/v2\/posts\/25095483","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pestpatrol.be\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pestpatrol.be\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pestpatrol.be\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/pestpatrol.be\/en\/wp-json\/wp\/v2\/comments?post=25095483"}],"version-history":[{"count":0,"href":"https:\/\/pestpatrol.be\/en\/wp-json\/wp\/v2\/posts\/25095483\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pestpatrol.be\/en\/wp-json\/wp\/v2\/media\/25095482"}],"wp:attachment":[{"href":"https:\/\/pestpatrol.be\/en\/wp-json\/wp\/v2\/media?parent=25095483"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pestpatrol.be\/en\/wp-json\/wp\/v2\/categories?post=25095483"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pestpatrol.be\/en\/wp-json\/wp\/v2\/tags?post=25095483"},{"taxonomy":"dipi_cpt_category","embeddable":true,"href":"https:\/\/pestpatrol.be\/en\/wp-json\/wp\/v2\/dipi_cpt_category?post=25095483"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}