Why Do Pests Seem to Increase in Late Summer and Fall?

Posted by Mosquito Squad Plus

September 14, 2026

Why Do Pests Seem to Increase in Late Summer and Fall?

Most people would tell you that summer and fall are their favorite seasons. After all, who wouldn’t love a stint of hot, sunny weather followed by the time of year made for pumpkin spice and evenings in the backyard. Unfortunately, these seasons are also more pest-heavy than winter and spring, and St. Louis is no exception.

That’s where Mosquito Squad Plus comes in to help. Our pest control in St. Louis helps control up to 90% of common pests, and we can maintain a recurring treatment cycle throughout the season to help keep them at bay while you enjoy your indoor and outdoor living space.

Does it feel like mosquitoes, spiders, ants, and stink bugs are everywhere this time of year?

We get it, and we can confirm that sense of growing pest populations is not in your imagination. In the Greater St. Louis area, a late-summer seasonal pest surge isn’t uncommon. The high temperatures we experience during this season, coupled with warm, moist air from the Gulf of Mexico, create the kind of humid conditions that many pests thrive in. At the same time, pests are also responding to shorter days and slight shifts in temperature by coming closer to your home.

Here’s what you need to know.

Are There Actually More Pests?

Spring is typically the start of the breeding season for many pests, which is why pest season doesn’t seem all that bad right at the beginning. At its worst in summer and fall, those early-stage pests (eggs, larvae, and the like) have developed into adults that are much more visible and, in some cases, more aggressive.

Around this time, they’re also looking for seasonal shelter before the colder weather kicks in, which is why you’ll see more and more pests coming closer to homes, garages, and other outbuildings. So while there aren’t necessarily more pests, late summer and fall feel more intense because more adult pests move closer to homes and living spaces.

Year-Round Pest Control for Uninterrupted Protection

When you need help with pests, Mosquito Squad Plus is here to offer pest control in Greater St. Louis. Home Shield, our perimeter pest control service, provides indoor and outdoor protection from crickets, wasps, mosquitoes, ants, roaches, and many other crawling pests. It uses Barrier Treatment Plus (made with EPA-registered products) to create a protective perimeter around your home that controls up to 90% of pests.

It lasts up to 21 days, after which we’ll return every three weeks during the season to reapply it. This service is exactly what you need for year-round pest control that adapts to every season and addresses dozens of different pest issues.

Where Do We Offer Pest Control in Greater St. Louis?

Mosquito Squad Plus is pleased to offer outdoor pest control services throughout the Greater St. Louis areas, including these towns and more.

Choose Mosquito Squad Plus for outdoor pest control in Greater St. Louis!

Call Mosquito Squad Plus of Greater St. Louis today for outdoor pest control near me. Get in touch with us by filling out our form online or calling us at for a free quote.

We additionally offer a 100% satisfaction guarantee. If you are not satisfied with your pest control treatment, call us within 21 days for a complimentary repeat treatment.