The answer to 'mosquito season' is that mosquitoes are typically most active and abundant during the warmer months, typically from spring through early fall. Mosquito season can vary depending on your geographic location, but in most areas, mosquitoes will start to emerge in early spring as the weather warms up and continue to be a nuisance until the first hard frost in the fall.
Mosquitoes thrive in warm, humid conditions and breed in standing water, so their populations tend to peak during the summer months when these conditions are ideal. Factors like rainfall, temperature, and humidity can all impact the length and intensity of mosquito season in a given area.