The answer depends on which pest you're treating, where the treatment occurs, which pesticide product is used, and its active ingredient. Typically, pest control applications last around 90 days. There are a few exceptions. Potency may be affected if outdoor applications are followed by consistent or heavy rainfall. These applications may only be effective for 60 days. Pesticides that treat flying insects, like flies and mosquitos, may only be effective for 30 days. So, if you think more pest control is needed, please call us.