Milkweed, boxelder and western conifer seed bugs invading Colorado houses

By Jeff Mitton | mitton@Colorado.edu | Department of Ecology and Evolutionary Biology University of Colorado, Boulder

PUBLISHED: February 12, 2026 at 5:45 AM MST | UPDATED: February 12, 2026 at 8:12 AM MST

Getting your player ready...

By far the most common of these bugs that I encounter inside the house are the boxelder bugs.

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