When Is the Peak Time for Mosquito-Borne Illness in Tennessee?

Posted by Mosquito Squad Plus

September 15, 2026

When Is the Peak Time for Mosquito-Borne Illness in Tennessee?

Lingering heat isn’t the only thing that late summer and early fall bring to Middle Tennessee. This is the peak period for potential mosquito-borne illness transmission.

If your yard has felt busier with mosquitoes lately, it’s not your imagination. Part of it comes down to the time of year. Not coincidentally, this is also the time of year when West Nile virus, the most common mosquito-borne illness in Tennessee, tends to be at its worst.

Cases usually start climbing in June as temperatures rise. They reach their highest point through August and September, then begin tapering off in October once cooler weather sets in. The late-summer-into-fall window is when the risk of transmission runs highest for people and pests in Middle Tennessee, even though it’s starting to feel more like fall than summer.

Why Does West Nile Virus Peak in Late Summer and Early Fall?

West Nile virus is associated with mosquitoes, but the reason it’s worst in late summer and early fall can be blamed on birds. Birds breed a lot in the spring and early summer. By the time it’s late summer, there are lots of young birds around. These very same birds also happen to be a well-known reservoir for West Nile virus. This means mosquitoes that feed on infected birds can pick up West Nile virus and pass it along with their next bite.

This same stretch of year is also when families spend the most time outside. It’s hard to beat Tennessee weather in the fall once the heat breaks. It’s perfect weather for cookouts, yard work, letting the dog out at dusk, and being bitten by mosquitoes. Peak mosquito activity and peak outdoor activity tend to occur at the same time: close to sunset.

Specialized Mosquito Control Services by Mosquito Squad Plus

Beyond our traditional barrier treatment, Mosquito Squad Plus of Nashville offers a few options for homeowners who want more targeted or continuous coverage during the high-risk months. A mosquito misting system installs discreetly around your property and releases short bursts of treatment on an automated schedule. You can enjoy steady coverage in the yard without having to think about it. This is good for properties that see heavy, recurring mosquito pressure.

If you have an outdoor wedding or backyard gathering coming up, you may also benefit from a one-time special event spray. It’s timed ahead of your event to help reduce the mosquito population while guests are outside.

We also handle commercial mosquito control for restaurants, event venues, parks, and other outdoor business spaces. Treatment schedules are built around when your customers and staff are on site.

Why Seasonal Mosquito Control Might Not Be Enough

Even well-timed seasonal treatments can only go so far. They’re built around mosquito season, so once the calendar turns, coverage winds down. This is right when other pests start looking for a way out of the surprisingly cold winters of the Nashville area.

This is where year-round coverage helps. Our Yard Defender program keeps mosquito control going while adding expanded pest control that shifts with the seasons. We address the pests that press hardest at each point in the year rather than only the ones active in midsummer.

Where Do We Offer Mosquito Control?

Mosquito Squad Plus of Nashville is pleased to offer mosquito control, tick control, as well as expanded outdoor pest control services throughout these areas in Davidson County, Wilson County, Sumner County, Williamson County, and beyond.

Choose Mosquito Squad Plus for Nashville mosquito control!

Mosquito Squad Plus treats mosquitoes, ticks, fleas, and many more outdoor pests throughout the Nashville TN area! Contact us today at (615) 492-3662 or fill out our online form for your complimentary mosquito control assessment and treatment quote.

Our pest control packages and related services all come with a 100% customer satisfaction guarantee!