Most paper wasps in a colony do die before winter arrives, but the colony itself is not entirely extinguished. Workers and males perish in autumn as temperatures drop and food becomes scarce, while a select group of mated females, called gynes, survive by entering a dormant state similar to hibernation. These overwintering queens are the sole link between one year’s colony and the next, and their survival depends on fat reserves, shelter quality, and the severity of the cold months ahead.
Which Paper Wasps Die and Which Survive
A paper wasp colony operates on an annual cycle. In spring and summer, the founding queen and her workers build the familiar open-comb nest, raise brood, and defend territory. By late summer, the colony shifts its energy toward producing the next generation of reproductive individuals: new queens (gynes) and males. Once these reproductives mate in autumn, the original queen, all the workers, and the males die off. The nest itself is abandoned. It will not be reused next year.
The gynes are the only members that carry the colony’s genetic legacy into the following spring. These mated females leave the old nest and seek out sheltered overwintering sites, sometimes called hibernacula, that protect them from predators, snow, and rain, though these shelters do surprisingly little to buffer them from low environmental temperatures.1PubMed Central. The costs of overwintering in paper wasps (Polistes dominula and Polistes gallicus): the use of energy stores Common hibernacula include rock crevices, behind loose tree bark, inside wall voids of buildings, under roof eaves, and in attic spaces. If you find a cluster of seemingly lifeless paper wasps behind a shutter or in a shed during January, those are almost certainly overwintering gynes.
How Gynes Survive Months Without Food
Overwintering gynes do not eat. They enter a state of dormancy called diapause, during which their metabolism drops dramatically. Research on two common European species, Polistes dominula and Polistes gallicus, shows that the resting metabolic rate of dormant gynes is suppressed compared to active individuals measured in summer, even at the same ambient temperature.2Physiological Entomology. The respiratory metabolism of overwintering paper wasp gynes (Polistes dominula and Polistes gallicus) This metabolic suppression is not simply a byproduct of being cold; it is a genuine physiological downshift that conserves limited energy stores.
The fuel that keeps a dormant gyne alive through winter is overwhelmingly fat. Studies tracking energy use in overwintering P. dominula found that lipids accounted for roughly 84 to 93 percent of the total energy consumed during dormancy, with glycogen stores making up most of the remainder and free sugars barely declining at all.1PubMed Central. The costs of overwintering in paper wasps (Polistes dominula and Polistes gallicus): the use of energy stores Total winter energy use per wasp was in the range of about 310 to 340 joules for P. dominula and around 247 joules for the smaller P. gallicus, amounts that translate to just a few joules per day. That is an extraordinarily low burn rate, and it is what makes months of fasting survivable.
The preparation for this long fast begins during larval development. Research on the North American species Polistes metricus found that gyne-destined larvae take longer to mature and ramp up production of a specific storage protein, a hexameric protein that serves as a nutrient reservoir for the dormant months ahead.3PubMed Central. A diapause pathway underlies the gyne phenotype in Polistes wasps, revealing an evolutionary route to caste-containing insect societies In other words, the decision to become a winter-surviving queen is not something that happens at the nest entrance in October. It is set in motion while the future gyne is still a larva being fed by workers.
Why Some Gynes Die Anyway
Not every gyne that enters a hibernaculum makes it to spring. Overwintering mortality can be substantial, and it comes down to several factors working together.
Body size is one of the most consistent predictors. Larger gynes are more likely to survive the winter and go on to claim a dominant position in the spring foundress groups that form around new nests.4PubMed Central. On status badges and quality signals in the paper wasp Polistes dominulus: body size, facial colour patterns and hierarchical rank A bigger body typically means larger absolute fat reserves, which translates directly into a larger energy budget for the dormancy period. A small gyne that enters winter with marginal fat stores may simply run out of fuel before spring arrives.
Temperature fluctuations are another killer, and in a counterintuitive way. While extreme cold can certainly be lethal, unseasonably warm spells during winter may be just as dangerous. Metabolic rate in dormant gynes rises exponentially with ambient temperature.2Physiological Entomology. The respiratory metabolism of overwintering paper wasp gynes (Polistes dominula and Polistes gallicus) A few warm days in January or February can spike the wasp’s energy burn rate, chewing through fat reserves that were budgeted for a steadier, colder winter. The gyne does not wake up and forage during these warm spells; it simply burns through its stores faster while remaining dormant. This makes mild, fluctuating winters potentially more dangerous than consistently cold ones, a point that becomes especially relevant when thinking about climate change.
Predation, fungal infection, and desiccation also take a toll, though these are harder to quantify. A hibernaculum that floods, or one that is discovered by a mouse or a spider, can wipe out an entire cluster of overwintering gynes at once.
Why Overwintering Gynes Cluster Together
If you find paper wasps in a winter shelter, you will often find them in groups rather than alone. This aggregation behavior has long intrigued researchers, and the intuitive explanation would be that huddling conserves heat or reduces metabolic costs, similar to what penguins do. But the evidence does not support that simple story. A recent study comparing solitary and aggregated overwintering gynes found no difference in metabolic rate between the two conditions. Aggregated gynes were actually more active than solitary ones, not less.5PubMed Central. Does the Aggregation Behavior of Overwintering Paper Wasp Gynes Provide Energetic Benefits?
If energy savings are not driving the clustering, what is? The answer is still being worked out, but the leading alternative hypotheses involve predator dilution (safety in numbers, with each individual less likely to be the one picked off), information sharing about suitable nest sites in spring, or simply a scarcity of high-quality hibernation spots that funnels gynes into the same locations. The fact that aggregated wasps showed higher activity levels suggests that social interactions during dormancy are more complex than they appear, and that being near other gynes may serve purposes related to spring nest-founding rather than winter survival per se.
What Happens When Gynes Wake Up in Spring
As temperatures climb in spring, surviving gynes rouse from dormancy and face a new set of challenges. They need to find food quickly to replenish depleted energy stores, locate or construct a nest, and begin laying eggs before the window for rearing the first generation of workers closes. Foundresses are more cold-tolerant than the workers they will eventually produce, which allows them to be active and begin nest construction during the cooler conditions of early spring when workers would not yet be able to function.6Behavioral Ecology. Division of labor and low temperatures predict geographic variation in thermal tolerance of a North American paper wasp (Mischocyttarus mexicanus cubicola)
In many Polistes species, spring gynes do not always go it alone. Multiple foundresses often join together on a single nest, forming a dominance hierarchy where one female becomes the primary egg-layer and the others serve as subordinate helpers. The hierarchy is not random. Research on P. dominulus has found that a foundress’s rank is linked to the relatedness structure within the group: highly ranked wasps were less likely to share a nest with their full sisters than lower-ranked wasps, and facial color patterns also correlated with rank.7Behavioral Ecology. Cues, concessions, and inheritance: dominance hierarchies in the paper wasp Polistes dominulus The subordinate foundresses accept a lower reproductive share, likely because they inherit the dominant position if the primary queen dies, which happens frequently enough to make the gamble worthwhile.
For homeowners, the practical upshot is that the paper wasps showing up around your porch or eaves in March and April are solitary or small-group foundresses looking for nest sites. They are not aggressive at this stage, because there is no brood to defend yet. This is actually the easiest time to discourage nesting: removing small starter nests (just a few cells, often with no workers present yet) in early spring is far simpler and safer than dealing with a mature colony of dozens of workers in July.
Climate Change and Overwintering Costs
The metabolic math of overwintering is finely tuned, and rising global temperatures are throwing it off. Model calculations using data from P. dominula and P. gallicus suggest that an increase of up to 3°C in mean winter temperature could drive energy costs up by as much as 40 percent.8PubMed Central. The Impact of Climate on the Energetics of Overwintering Paper Wasp Gynes (Polistes dominula and Polistes gallicus) Because hibernacula offer little insulation from outdoor temperatures, the wasps inside are essentially at the mercy of whatever the ambient air is doing.
A 40 percent increase in energy demand does not mean all gynes die, but it shifts the survival threshold. Wasps that would have scraped through a typical winter on marginal fat reserves now fall short. Populations in regions with highly variable winter weather, where warm spells alternate with deep cold, may be especially vulnerable. Paradoxically, paper wasps in consistently cold northern climates could fare better under moderate warming than paper wasps in temperate zones where winters become milder but more erratic, because erratic warmth burns through fat stores without offering any foraging opportunity to replenish them.
For species like P. dominula, which has spread aggressively across North America and other regions outside its native Mediterranean range, the interplay between winter severity and overwintering success is one of the factors governing how far north the species can establish itself. Warmer winters might initially seem like they would benefit an expanding population, but the energetic cost data suggest the relationship is more complicated. A stable, moderately cold winter is cheaper to survive than a warm, unpredictable one.
Paper Wasps vs. Other Social Wasps in Winter
The annual colony cycle with overwintering queens is not unique to paper wasps. Yellowjackets and hornets follow the same broad pattern: the colony dies off in autumn, and only mated queens survive to found new colonies in spring. But paper wasps differ in some important ways.
Paper wasp nests are open-comb structures without an outer envelope, which means they offer no insulation to the brood or adults during the active season and are abandoned entirely in fall. Yellowjacket and hornet nests, by contrast, have papery outer walls that provide some thermal buffering while the colony is active, though these nests are also abandoned when the colony dies. The key distinction is that paper wasp gynes tend to overwinter in exposed or semi-exposed sites, sometimes in surprisingly conspicuous locations like window frames or behind outdoor fixtures, whereas yellowjacket queens more often burrow into soil, leaf litter, or rotting logs.
The overwintering physiology is broadly similar across these groups. All rely on fat reserves accumulated before dormancy and on metabolic suppression during the cold months. But the specific survival rates, energy budgets, and cold-tolerance thresholds vary by species and latitude. A paper wasp gyne in Georgia faces a very different winter energy challenge than one in Michigan, and even within a single region, different species partition the available hibernation microhabitats in ways that likely reduce direct competition.
What to Do If You Find Overwintering Wasps in Your Home
Paper wasp gynes commonly overwinter inside wall voids, attic spaces, and gaps around window frames. Occasionally they end up inside living spaces, especially during warm spells that briefly rouse them from dormancy. A groggy paper wasp walking slowly across your ceiling in February is not a sign of an active nest. It is a disoriented overwintering queen that warmed up enough to move but has nowhere to go.
These wasps are not aggressive when dormant or semi-dormant. You can usually catch one under a glass and relocate it outside, though doing so in the middle of winter likely means it will die from cold exposure. Leaving it alone is also an option; it will either return to dormancy or die on its own. If you are finding multiple wasps indoors during winter, they are entering through gaps in your home’s exterior. Sealing cracks around eaves, soffits, window frames, and attic vents in late summer, before gynes seek out hibernation sites, is the most effective long-term prevention.
Insecticide sprays aimed at overwintering wasps are generally unnecessary and wasteful. The wasps are not causing structural damage, they are not building nests inside your walls, and they will leave on their own in spring. The real intervention window is early spring, when you can knock down the small starter nests that returning foundresses build before a full colony develops. Once workers appear and the colony grows through summer, removal becomes a more involved and riskier task.