Summertime means more leeches. Leeches reproduce in the spring. The young leeches are out of their cocoons several weeks later, just in time for swimming season! While generally nocturnal creatures, leeches are attracted to water disturbance like that created by swimming and wading.

Are leeches around all year?

However, unlike the oligochaetes, leeches do not show the clitellum all year. Instead, it only becomes visible during the breeding season. Leeches are bilaterally symmetrical, with thick muscular bodies. Usually they are dorso-ventrally (front to back) flattened and segmented, though the segments are not often seen.

Are leeches in season?

Leeches become number one by May and produce well through summer to October.