10/24/2026
π Why do so many areas in Western Canada seem to have so many boxelder bugs lately? And has the problem been getting worse?
If it feels like boxelder bugs have become more noticeable in recent years, you are not alone in noticing them.
Each fall, these black-and-red insects can gather in surprisingly large numbers on sunny, south- and west-facing walls, windows, siding and foundations as they search for protected places to overwinter.
Why do boxelder bugs gather on houses in the fall?
As temperatures cool, adult boxelder bugs seek warm, protected overwintering sites. Sun-warmed exterior walls can attract large aggregations before the insects move into cracks, siding and other sheltered spaces.
Are boxelder bugs harmful to your home?
Boxelder bugs are primarily a nuisance pest rather than a destructive one. The bigger problem is their ability to gather in large numbers and potentially enter homes, where they can remain hidden through winter and reappear indoors.
Why can the problem seem worse year after year?
Boxelder bug populations can vary considerably from one season to another. Weather, available host trees, successful reproduction and suitable overwintering conditions can all influence how many homeowners see in a particular year.
And when the same Winnipeg property provides the conditions they are looking for, the fall invasion can become a very familiar sight. π π
Buzz Boss takes a closer look at the Winnipeg boxelder bug problem in particular, why these insects congregate around homes and what homeowners can do about them. π
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Winnipeg is seeing heavier boxelder bug activity. Learn what's driving the surge, why the city is vulnerable, and when to act before bugs move indoors.