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Overwintering pests such as Asian lady beetles, brown marmorated stink bugs, cluster flies, and boxelder bugs become active and move indoors on warm winter days because transient temperature spikes raise their body temperatures above the threshold for metabolic activity, prompting them to seek sunlit surfaces or sheltered refuges. Many of these species enter a state…

When pests overwinter in your home, they are using the indoor environment to survive the cold months by sheltering in warm, dry voids, entering slowed metabolic states or dormancy, and in some cases continuing to feed and reproduce. Overwintering behavior can include seeking attic or wall voids, clustering in protected gaps around windows and eaves,…

Ladybugs—a common name for many species in the beetle family Coccinellidae—are generally native or long-established aphid predators, whereas Asian lady beetles (Harmonia axyridis) are a non‑native species introduced from East Asia that often behaves differently in appearance, abundance, and seasonal habits. Asian lady beetles tend to show greater color and spot variability, a characteristic dark…

Asian lady beetles swarm homes in the fall because declining day length and cooler temperatures trigger them to leave summer feeding sites and seek warm, sheltered overwintering locations such as attics, wall voids, and crevices in buildings. As they congregate, individuals release aggregation pheromones that attract more beetles, producing the large, dense clusters homeowners notice…

Stopping cluster flies from overwintering in walls requires denying them access to protected voids by sealing exterior gaps around eaves, rooflines, windows, and utility penetrations, and by removing indoor conditions that provide warmth and shelter for congregating adults. Cluster flies (Pollenia species) enter structures in autumn to seek insulated cavities where they can cluster through…

Cluster flies (Pollenia rudis) gather in attics and upper windows each fall because adult flies are seeking sheltered overwintering sites with stable temperatures and access to daytime warmth from sun-exposed walls and eaves, where they can enter a state of dormancy until spring. They penetrate buildings through small gaps in soffits, attic vents, window frames…

Boxelder bugs are generally harmless to people and pets and cause only minor, mostly cosmetic damage to plants by feeding on seeds and tender foliage. These sap‑sucking insects (Boisea species) rarely bite humans, do not transmit plant or human diseases, and their feeding typically results in stippling, browning, or distorted seeds rather than widespread plant…

Boxelder bugs commonly swarm the sunny, south- or west‑facing walls of homes in autumn because they are cold‑intolerant insects that congregate on warm, sun‑warmed surfaces to raise their body temperature and locate nearby overwintering sites. They are attracted to heat-retaining siding and masonry near their host trees (boxelder, maples, and other sap‑feeding species), where large…

The most effective way to get rid of stink bugs without triggering their defensive odor is to remove them intact using gentle capture and exclusion techniques—never crush them and avoid rough handling or high-force sprays that stress the insect. Practical non‑smashing options include scooping or trapping individual bugs in a jar or cup, using soft…

In October, brown marmorated stink bugs (Halyomorpha halys) commonly move toward and enter Seattle homes as they seek sheltered, above-ground sites to overwinter. This species responds to shortening day length and cooler autumn temperatures by aggregating in protected crevices on buildings, favoring attics, wall voids, window frames and other warm, dry microhabitats where they can…