Insects are found very high in the atmosphere. The are only limited to the altitude that oxygen is still available. We have to use oxygen tanks above 26000-27000 feet. Insects are much smaller and can probably go a little bit higher. Weather balloons have found skeletons of dead insects as high as 45000 feet. I dont think they fly this high because the temperature is at or near freezing.
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A zone about 25 feet above the Earth's surface (depending on atmospheric conditions and species of insect) is known as the flight boundary layer, where wind speed is equivalent to maximum insect flight speed. Because wind speed increases with height, an insect needs to hang out below the flight boundary layer if it wants to be able to fly in any direction in its quest for food, a mate or shelter. However, insects are commonly found at much greater heights. Mosquitos have been collected at 1,000 feet. Houseflies can probably get that high, too. Migrating insects such as locusts and butterflies ascend much higher. Ground-based radar has detected insects nearly two miles above the surface. At these heights, insects can maneuver about, but the wind is too strong for them to travel upwind. This is why, for example, plagues of locusts lasting several years tend to spread according to the direction of the prevailing winds. Insects cannot fly if it is too cold. Temperature decreases with altitude, but in a temperature inversion, a layer of warm air sits atop cooler, denser air. Temperature measurements with kites have shown that migrating insects concentrate in the warm air at the top of temperature inversions.
they fly as high as your head and as low as your toes. If you wave your arms above your head they will also fly the extra distance.