Reasons Why Your Yard Is Swarmed With Flies

If you're finding your yard swarmed with flies, it's not just an accident. According to Dr. Jim Fredericks, Board Certified Entomologist and Senior Vice President of Public Affairs at the National Pest Management Association (NPMA), "There are a few factors that could attract flies to your yard, including their primary food sources. Flies are often drawn to decaying organic matter like compost piles, pet waste, and overripe fruit." These materials create an ideal environment for flies to lay their eggs, providing a food source for the larvae once they hatch.

In fact, some types of flies are especially attracted to decaying animals. Dr. Fredericks explains, "Blow flies, which often have a metallic blue or green color, are especially attracted to dead animals and can often be a sign that something has died nearby." If you've noticed a sudden surge of blow flies in your yard, it's worth checking for any dead critters, as they can draw in a swarm of flies. 

Another lesser-known factor that attracts flies is standing water — which can attract swarms of dragonflies, too. Like dragonflies, which need water for their life cycle, flies such as drain flies are also drawn to moisture, especially in areas where water collects. Flies need moisture to breed, and any water buildup — whether it's in a puddle or clogged gutter — could quickly become a breeding ground. These moist spots provide an ideal environment for fly larvae to develop, making it crucial to remove stagnant water in your yard to reduce fly populations.

Dr. Fredericks points out that pet waste is another major attractant for flies. Leftover dog or cat waste can quickly turn into a breeding ground, providing both food and moisture for flies to thrive. "Promptly clean up any pet waste to prevent potential fly breeding sites from developing," he notes, as even small amounts of waste can attract flies in a matter of hours.

Another less obvious factor could be the presence of crane flies. "Crane flies, which are sometimes mistaken for giant mosquitoes, will emerge in yards in large numbers during certain times of the year," explains Dr. Fredericks. He adds, "Some crane fly larvae feed beneath the soil on grass roots and can be seen emerging in large numbers from infested lawns." Keeping your lawn healthy and well-maintained will help limit these pests, reducing the potential for a fly infestation.

Plants like rosemary are beloved in gardens, as they repel pests naturally. If you've noticed more flies in your yard, try this method as a natural solution. For other ways to get rid of flies once you've identified the source, Dr. Fredericks recommends to "regularly dispose of trash and use sealed garbage cans." If the infestation persists, you can always turn to a professional. "It's best to work with a qualified pest control pro promptly before it gets out of control. They will be able to inspect your home, confirm the species and recommend a course of pest control to treat and get rid of the flies."