Multicolored Asian ladybird beetles are strongly seasonal and become most active during the fall as they search for warm places to overwinter. They are attracted to light-colored surfaces and sunny areas, which is why they are often seen clustering on the sides of homes and buildings. 

Homeowners commonly notice large numbers gathering on exterior walls, windows, and entry points over a short period of time. As temperatures drop, these beetles may begin entering through small cracks and gaps, eventually settling in wall voids, attics, or other protected spaces. Once inside, they typically remain inactive but can reappear on warmer days, especially near windows, ceilings, or light sources. This can lead to repeated sightings over time, even if no new beetles are entering the home. 

While they do not damage structures, they can become a nuisance due to their numbers. When disturbed or crushed, they may release a yellowish fluid that can stain surfaces and produce an unpleasant odor. In some cases, they may also cause minor irritation if handled. Because their activity is tied to seasonal behavior and overwintering habits, infestations can feel sudden and persistent. Preventing entry before seasonal changes is the most effective way to reduce indoor activity.