When Are Horse Flies Active?

The flies are most active just before sunrise and three hours after sunrise. Another peak in activity is two hours before sunset and just after sunset. Timing your activities around those active periods may provide a little relief, but those are also the coolest times of the day when most people enjoy being outside.

What months are horse flies active?

Only the female horse fly drinks blood, and the flies tend to be most active during the months of July and August; this is because the females of the species need blood from a vertebrae animal to give birth.

What is the season for horse flies?

Horseflies are most active in hot weather, mostly in summer and autumn during the daylight hours. Most species also prefer a wet environment, which makes it easier for them to breed.