Mosquitoes usually stay active into October in Connecticut. Once temperatures drop consistently into the fifties, the mosquitoes will taper off.
Mosquitoes aren’t just a problem in summer. Around Hartford, you could still be dealing with mosquitoes well into October. And it’s worth continuing to treat because this is the time of year when West Nile virus transmission is at its worst.
Mosquito populations build across a season. They don’t just spike and fade. Each generation produces the next. Even with less favorable weather in September, the yard simply has a lot of mosquitoes in a way it didn’t in May. Then every time there’s a rainstorm, each container and low spot that dried out in the summer fills up again and gives mosquitoes another chance to breed.
West Nile virus tends to be worse around this time of year. The virus spreads from birds to mosquitoes in the summer, and by the time it’s fall, a greater share of mosquitoes are carrying the virus. Most human cases in Connecticut happen between August and early fall. Eastern equine encephalitis, though rare, follows a similar pattern late in the mosquito season.
Mosquito activity continues until sustained temperatures drop into the fifties. This often happens well into October and occasionally later in a mild year. If you stop mosquito treatment on Labor Day, you’re likely to see another surge in mosquitoes before the first frost comes in. So keep checking for standing water and clearing it from your yard until it’s truly cold outside.
If your yard is still buggy in September, Mosquito Squad of Hartford can help. Mosquito Squad runs treatment through the full season rather than stopping at the end of summer. This will help you protect your yard with up to 90% reduction in mosquito activity on a recurring 21-day cycle.
