Most Iowans welcomed this year’s mild winter, giving us a break from frigid temperatures. But, did it come with a cost?
With above-average temperatures recorded across most of the state during the 2024-2025 winter season, conditions were perfect for pests like termites, mosquitoes and even cockroaches.
“Winter is nature’s pest control,” said Zachary Smith of Smith’s Pest Management in a news release. “But when it’s too warm for too long, pests that would normally die off or go dormant just keep breeding. That sets the stage for bigger infestations come spring and summer.”
Spring storms could increase populations, too, said Zach Schumm, director at Iowa State Plant and Insect Diagnostic Clinic. With moisture in the air and ground during early spring, breeding conditions were ideal.
So, here’s what to know about pests in Iowa this summer.
What are Iowa’s top pest threats this summer?
Mosquitoes: All these bugs need to survive are water and warmth, and Smith said they’ve already had both. Expect higher numbers than usual this summer, especially after rain.
Termites: With a mild winter, termite colonies were able to stay active. Smith said early swarms have already started this year, meaning they had an underground head-start.
Cockroaches: Roaches love warmth and humidity, and Smith said they thrive when winter doesn’t drive them back.
Ticks and fleas: Warm conditions can extend breeding seasons for these pests, Smith said.
How can Iowans fight against insects and pests?
Fighting against pesky bugs is an age-old summer issue. And treatments may not be effective, either.
“Treatments are typically impractical for a lot of the annoying insects that we see,” Schumm said. “But mosquitoes are kind of an easy one because we know where they reproduce.”
A good way to get ahead of mosquito season is by walking your property and draining any standing water — gutters, birdbaths, etc. Also, look for mud tubes along the foundation and soft spots in wood. Remove them to prevent termites, and don’t let mulch or wood touch your home’s siding, Smith recommends.
Keep your lawn mowed, trimmed and clear of debris to keep fire ants and ticks away, Smith said. And don’t forget crawlspaces and attics, where cockroaches love to hide.
Don’t think you’re missing out just because you don’t live on a farm. Urban and rural areas are equally at risk, Smith said.
“Cities are just as at risk,” he said. “Urban neighborhoods have storm drains, standing water, and plenty of trash — all prime breeding zones.”
Victoria Reyna-Rodriguez is a general assignment reporter for the Register. Reach her at vreynarodriguez@registermedia.com or follow her on Twitter @VictoriaReynaR.
This article originally appeared on Des Moines Register: Did Iowa’s mild winter cause more mosquitoes, bugs for the summer?