Mosquitoes are active across Chicago from late May through October, breeding in any standing water — from clogged gutters to forgotten plant saucers. Beyond ruining backyards, Chicago mosquitoes can carry West Nile virus, which Cook County tests for every season.
What Do Mosquitoes Look Like?
Mosquitoes are small flying insects about 1/4 inch long with long thin legs, narrow wings, and a long needle-like proboscis. Only females bite — they need blood for egg development. Common Chicago species include the Northern house mosquito and the Asian tiger mosquito.
Where Do Mosquitoes Hide?
Mosquitoes rest in shaded vegetation, under decks, in dense shrubs, and behind garage doors during the day. They breed in any standing water — birdbaths, gutters, planters, kiddie pools, tarps, tire ruts, and even bottle caps.
Signs of a Mosquito Infestation
Itchy raised welts on exposed skin (especially ankles and arms in the evening), buzzing around your ears, swarms near standing water at dawn and dusk, and visible larvae (wrigglers) in untreated water sources.
Health Risks of Mosquitoes
Chicago mosquitoes can transmit West Nile virus, La Crosse encephalitis, and rarely Zika. Bites also cause significant skin irritation and allergic reactions in some people.
How Sleep Tight Treats Mosquitoes in Chicago
Sleep Tight applies barrier mosquito treatments to vegetation, eaves, fence lines, and undersides of furniture where mosquitoes rest, and we treat standing-water breeding sites with larvicide. One application typically protects a Chicago yard for 3–4 weeks.
Need help with mosquitoes in Chicago?
Sleep Tight Pest Control offers same-day chicago mosquito treatment across every Chicago neighborhood and suburb. Call (773) 240-5932 or get a free quote online.
Frequently Asked Questions
When does mosquito season start in Chicago?
Mosquito activity in Chicago picks up in late May and runs through mid-October, with peak biting in July and August.
How often do you need to treat for mosquitoes?
Our barrier treatment lasts 3–4 weeks. Most Chicago customers schedule treatments every 3 weeks from June through September.
Is the treatment safe for kids and pets?
Yes — once dry (typically 30 minutes) the treatment is safe for kids and pets to use the yard normally.
Do you treat for West Nile virus mosquitoes?
Our treatment kills all adult mosquito species in your yard, including Culex mosquitoes that can carry West Nile virus in Chicago.