Are Houseflies Invading Your Home in St. Louis
Posted by Mosquito Squad
October 13, 2025
As autumn settles into the Greater St. Louis area, you might have noticed an uptick in houseflies – buzzing outdoors and getting inside your house.
First of all – gross! And believe it or not, while summer is the busiest season for flies, fall often sends them buzzing toward your home. They’re in search of warmth and shelter indoors, which is exactly where you don’t want to see them. If you’re seeing more flies than usual, you’re not alone. Mosquito Squad of Greater St. Louis can help.
The Number One Reason Flies Are Making Their Home Inside Yours
Houseflies and flies in general, thrive in warm weather. Once cooler evenings kick in across the region, they have but one goal – getting inside, where it’s warm and cozy, in search of a spot to overwinter. Your home is everything they could hope for this time of year, providing:
- Warmth to escape the chilly temps
- Food sources – from fruit bowls to garbage bins
- Breeding grounds – even in autumn, houseflies will reproduce in organic materials, drains, and trash bins
- Shelter in attic, wall voices, and basements
The Potential Risks of Fall Fly Invasions
Beyond their utter annoyance and constant buzzing, houseflies can spread more than 60 diseases, including E. coli and salmonella. Every time they land on your counter or food, they could be transmitting harmful bacteria they’ve picked up on rotting garbage, compost piles, or even animal waste.
How to Keep Them Out of Your Home
Mosquito Squad of Greater St. Louis recommends various means of preventative measures to help reduce indoor flies this fall:
- Seal up potential entry points
- Eliminate sources of food and take out the trash frequently
- Fix leaks and standing water that might create breeding grounds
- Call Mosquito Squad for professional outdoor fly control services
Search for outdoor pest control St. Louis and call Mosquito Squad!
Don’t suffer outdoor pests in your backyard or inside your home! Mosquito Squad provides fast-acting Saint Louis pest control. Schedule your free pest assessment and quote by calling (314) 582-3980 or filling out our online form.
