The answer to 'how long does carpenter ant treatment last' is that the effectiveness of carpenter ant treatment can vary, but generally it lasts for several months to a year or more. Carpenter ant treatments typically involve a combination of insecticide application and other measures to eliminate the colony and prevent future infestations.
The longevity of the treatment depends on factors like the size and location of the colony, the type of insecticide used, and whether any nest sites or food sources remain that could allow the ants to reestablish. With a thorough treatment by a professional pest control technician, you can expect the effects to last for at least 6-12 months in most cases. However, ongoing monitoring and potential retreatment may be necessary to fully eliminate a persistent carpenter ant problem.