Sand flies are very small and may be hard to see; they are only about one-third the size of typical mosquitoes. Sand flies usually are most active in twilight, evening, and night-time hours (from dusk to dawn).

Are sand flies seasonal?

Activity (incl.

In temperate regions adult sand flies are only present during the summer. In addition, the various species of sand fly have different seasonal activity periods and daily peaks of biting activity.

When are sand flies the worst?

You can buy insect repellent that says it works against sand fleas, but you're better off just going straight for oil instead. Sand fleas are at their worst during the early morning and late evening hours when the temperatures cool off a tad, so schedule your beach time in during the middle of the day.