10/20/2026
Flies stacking up on the windows of your mountain rental this fall? Your crew didn't miss anything. Those are almost certainly cluster flies.
They breed in earthworms outside all summer, then crawl into walls and attics to spend the winter. Every sunny day, they wake up and head for the brightest windows, right where guests can see them. And a lot of the usual fixes (fly paper, lawn spray, bombing the walls) either don't work or make it worse.
New on the blog: what cluster flies are, why foothills rentals get hit so hard, and what to do right now to keep them out of your reviews. Link to the full post is in the comments.