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winter flies

Flies in the winter may sound like a travesty. However, a fly infestation during cold weather isn’t as uncommon as you may think. There are several species of flies that can survive as the temps drop, like cluster flies and house flies, for example.

Both cluster and house flies lay eggs in out-of-the-way areas so they can hatch during the winter months. You may be wondering, where do flies go in the winter and, where are these “out-of-the-way” places you speak of? Unfortunately, flies can survive the winter by setting up shop in your home.

Whether you have cluster flies overwintering in your walls or fruit flies buzzing around your food, you’re probably ready to get these pesky things out for good. Here’s what you should know about winter flies:

How Do Flies Survive the Winter?

There are over 20,000 different species of flies in North America alone. With that much biodiversity, there are bound to be many different approaches to handling cold weather, including:

Why do I have flies in my house in the winter?

1. Why do we have fruit flies in the winter?


Phorid flies, blow flies, and fruit flies in the winter get cozy in the nearest trash pile. They preserve heat by staying as covered and contained as possible. They feed off the organic material they’ve buried themselves in to survive until spring. Because of this, it isn’t rare to have a fruit fly problem in winter.

2. How do cluster flies survive the winter?


House flies and cluster flies hatch during the winter. Adults lay their eggs in safe and warm areas. This can be inside homes, tucked into garages, or anywhere they consider reasonably safe. The egg-laying females die naturally after birth, but the eggs go on to hatch during the winter. Cluster flies are particularly common in winter because of their ability to quickly reproduce indoors, creating “clusters” of problem pests.

Cluster flies and several other species can enter diapause during the winter. This semi-dormant state allows these flies to preserve heat and energy when the climate isn’t ideal. Unlike true hibernation, diapause can be short-term. The moment the temperature rises again, flies can wake up and begin hunting and spreading.

Cluster Flies: Where Do Flies Come from in the House in Winter?

Cluster flies are the most likely fly species to give you a hard time this winter. They’re especially sneaky because they love laying eggs in walls. This means you can’t seal any cracks or crevices in walls because you might trap them inside where they’ll die and attract even more obnoxious pests.

How to Get Rid of Cluster Flies in Winter

So, what can you do about cluster flies in the winter? You have a couple options, including:

  • Vacuum up visible flies
  • Use flypaper
  • Apply a safe and approved indoor pesticide
  • Seal gaps and cracks around doors and windows. This is a great way of preventing cluster flies.
  • Simply wait for them to leave. If the flies in your home this winter aren’t being too annoying or disruptive, you can just leave them alone. During the spring, cluster flies will vacate your home so they can enjoy the outdoor heat. Once they’re gone, you can seal their entry points like mentioned above.

Cluster flies stuck on flypaper

Dealing with a Winter Pest Infestation? That Won’t Fly.

If you’re not willing to wait until spring emerges or the tactics above have proved unsuccessful, you can always get in touch with Plunkett’s Pest Control! When you’ve got flies in your house during winter, we’re the folks to call. We’ll diagnose your current infestation, remove it, and ensure it can’t come back… all before spring! Ready to get started? Schedule a service today!

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