What time of year do leeches come out?

Leeches typically become more active in the warmer months, particularly during spring and summer when temperatures rise and rainfall increases. They thrive in moist environments, so after heavy rains or during wet seasons, they are more likely to be found in ponds, streams, and marshy areas. Depending on the region, their activity can vary, but generally, late spring through early fall is when they are most commonly seen.