
Chicago is one of the most pest-challenged cities in the United States. This guide covers everything you need to know — from identifying common Chicago pests to understanding your treatment options and legal rights as a tenant.
Chicago's housing stock, dense urban geography, and climate create ideal conditions for a specific lineup of pests that show up year after year:
Spring (March–May): Ants and cockroaches emerge from winter dormancy. Rodents are still active and beginning to nest.
Summer (June–August): Peak bed bug season due to travel volume. Mosquitoes, wasps, and ants are at maximum activity.
Fall (September–November): Rodents migrate indoors as temperatures drop. Stink bugs and overwintering pests look for warm cracks.
Winter (December–February): Rodents, cockroaches, and bed bugs all remain active indoors — Chicago winters don't kill them, they push them closer to you.
See our seasonal guides: mosquito season, bed bug season, and rodent season.
Aging housing stock: Many Chicago buildings are 80+ years old, with shared walls, common chases, and entry gaps that make pest movement easy and exclusion difficult.
Dense apartments: Bed bugs and cockroaches move between units through outlet boxes, baseboards, and shared plumbing. A single untreated unit can re-infest a whole floor.
Chicago winters don't kill bed bugs. Bed bugs survive indoors year-round and thrive in heated buildings. Winter is when most homeowners notice them.
The Chicago rat problem: Chicago has consistently been named the "rattiest" city in America. Aging sewers, alley dumpsters, and gangways drive infestations citywide.
Under the Chicago Residential Landlord Tenant Ordinance (RLTO), landlords are required to maintain habitable conditions, including addressing pest infestations not caused by the tenant. Illinois has bed bug disclosure laws requiring landlords to notify tenants of recent bed bug history in a unit.
Heat treatment vs chemical: Heat is chemical-free and kills all bed bug life stages in one session. Chemical treatment is lower cost and works well for smaller infestations. See our heat treatment and liquid treatment pages.
One-time vs recurring: One-time service is appropriate for active infestations of a single pest. Recurring programs (monthly, bi-monthly, quarterly) prevent new infestations and are recommended for properties with chronic issues.
DIY vs professional: DIY can address minor ant or spider issues. For bed bugs, cockroaches, or rodents, professional treatment is dramatically more cost-effective than the months of failed DIY most people try first.
Sleep Tight serves all 77 Chicago neighborhoods. Here are some of the areas we treat most often — each page includes location-specific pest information and pricing:
See all Chicago service areas.
Need pest control in Chicago? Sleep Tight offers same-day service citywide. Call (773) 240-5932 or request emergency service.
Same-day service available across Chicago. Call now or schedule online.