Treatment Timing Calculator
Residual treatments fade and new mosquitoes keep emerging, so protection is a rhythm, not an event. Pick your last treatment date (or the day your season starts) and see the schedule that keeps coverage from lapsing.
That window matches how fast a new generation can replace the one your last treatment knocked down. EPA describes a life cycle that typically completes in about two weeks and can run as fast as four days in hot weather, so waiting a month means protection lapses well before the next visit.
At an every-14-day rhythm, that is about 4 visits from your start date through the end of October.
Honest notes: season length varies by region and by year, so treat the end month as your local judgment call. Weather matters too; heavy prolonged rain can shorten a residual's life, which is why a good service times visits to the forecast rather than a fixed calendar.