Cluster Flies

Category: Flies

Scientific Name: Pollenia spp.



Color: Dark gray in color with yellow hairs

Size: 3/8 of an inch in length

Region: Found throughout the United States except for the states bordering the Gulf of Mexico.

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Important Considerations:

  • During the winter, Cluster Flies like to enter homes or other structures to escape the cold.
  • Cluster Flies typical go back to the same structures every year to overwinter.
  • Like other flies, they are attracted to light. Unlike house flies though, they are much slower and may seem sluggish.


Where to Find Them on Your Property?

Once inside a house or structure, cluster flies like to hangout in wall voids or attics. They are also attracted to lights and will swarm a light when they find one.