Why Do Flies Come Out in Winter?

Flies are seasonal insects and hibernate during the winter. This reduces their metabolic rate, but it keeps them alive. While they don’t need to eat during winter, they do use their fat reserves for flight. However, if the weather turns too cold, they will die.

Flies can also enter your home through small holes, such as those under the eaves. As the season changes, they look for warmth, and so they may find their way inside. To prevent this, you should seal any holes in your home or garage. Also, it is not a good idea to leave dead flies out.

When winter hits, house flies come out in numbers. The large black flies are particularly annoying, especially if they are clustered on window sills or bed rooms. These insects are particularly common this year, which is partly due to wetter weather conditions. This species is also known as a cluster fly and can live in attics, basements, and irrigated grass.

Adult flies spend most of their time mating and laying their eggs. The eggs hatch after about three days. The larvae emerge as maggots and feed on food sources nearby.