What month should you spray for bugs?

The best month to spray for bugs depends on your region and target pest, but for general preventative pest control the ideal months are early spring, specifically March through May, with a second important window in early fall, September through October, for year-round protection. Early spring spraying is considered most important because as temperatures rise above 50 degrees Fahrenheit, overwintering pests become active, so March, April, and May treatments create a barrier before populations explode. In March and April, termites swarm to establish new colonies, ants including odorous house ants and carpenter ants start foraging into kitchens, and wasps begin building nests, so spraying foundation, eaves, and entry points then prevents major infestations. May is excellent for mosquito prevention by treating standing water areas and vegetation before mosquito populations peak in June, July, and August, which are the most active months for mosquitoes, fleas, cockroaches, and flies due to heat accelerating reproduction. June through August treatments focus on reducing active populations. September and October spraying is the second best window because as temperatures drop, rodents, spiders, stink bugs, boxelder bugs, and cockroaches seek warmth indoors, so sealing cracks and applying exterior barrier sprays in fall prevents winter invasions. Winter months December through February are good for indoor treatments for German cockroaches, bed bugs, and rodents already inside. Most professionals recommend quarterly spraying in early spring, early summer, early fall, and winter for continuous protection.