Depending on where you stores are located, Mosquito Season might seem like all year long. In some states that may be true. For other retailers the mosquito activity will begin when the temperature reaches a consistent level of 50° F. At his level the mosquito eggs begin hatching and the mosquito season begins.
PARA'KITO MAP: The shape of mosquito season by state - Using Average Time
Related information: Cases of mosquito born diseases are reported to CDC by state and local health departments. Check the iteractive map on CDC website here https://www.cdc.gov/zika/reporting/index.html