We have no contracts, and no commitments, so you are not obligated to continue service and may stop treatment at any time. In order to best control mosquitoes in your yard, it is recommended to start as early as possible in the Spring and continue treatments as late as possible in the Fall. When adult mosquitoes lay eggs, those eggs can survive the colder months (even the harshest winter), so treating your property in the Spring, Summer, and Fall will best control the mosquito population. The length of mosquito season will depend on your climate, so it is best to contact your local office for the recommended treatment schedule.