Common Pests in Joliet, IL by Season

Spring

As the ground warms, ants become active and start foraging into kitchens, and subterranean termite colonies release winged swarmers near windows — the season to tell swarmers from flying ants. Carpenter ants appear around damp wood, and the first wasp queens scout eaves for nest sites.

Spring is the window to fix moisture, seal gaps winter wore open, and knock down early wasp nests while they are small.

Summer

Summer is peak season for outdoor pests. Mosquitoes build near the Des Plaines, DuPage and Kankakee river corridors, ticks wait at forest-preserve yard edges, and wasp and yellow jacket colonies grow toward their aggressive late-summer peak. Fleas and ants stay active, and pantry pests can appear in stored dry goods.

This is when yard barrier treatments, tick-edge control and stinging-insect nest removal matter most.

Fall

Fall is the big migration indoors. Mice and rats move toward heated buildings — and at harvest, field mice are displaced from Will County cropland — while boxelder bugs and Asian lady beetles cluster on sunny walls to overwinter and slip inside. Spiders and cluster flies move in too.

Sealing entry points before fall is the single most effective step of the year, closing the door ahead of the seasonal push.

Winter

Pests do not disappear in winter; they shelter. Rodents already inside stay active in walls and attics, overwintering insects wait in voids and reappear on warm days, and a heated home can keep some pests going year-round. Winter is a good time for interior rodent work and for planning the spring exclusion and treatment that gets ahead of the next cycle.