Mosquito Control in Toronto & GTA
Mosquito season in Toronto runs May through September. GTA properties near ravines and waterways face the highest pressure. Professional mosquito control uses larvicide in standing water and barrier treatment to reduce populations around your property.
Licensed mosquito control professionals across the GTA serve North York Don Valley properties, waterfront homes in Etobicoke and Mississauga, and backyards in Brampton and Markham. PestRecord matches you with verified local companies — compare quotes from pros who identify every breeding source.
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Typical Cost Range in the GTA
$150–$500
Final cost depends on severity, property size, and treatment method.
Mosquito season in Toronto runs May through September, with peak activity in July and August. The GTA's ravine systems — the Don Valley, Humber River, Rouge River, and Credit River — create ideal mosquito breeding habitat. Properties in North York, Etobicoke, and Scarborough that back onto these ravines face the highest mosquito pressure in the GTA.
Mosquitoes breed in standing water. Every stagnant puddle, clogged eavestrough, and blocked storm drain is a potential breeding site. A single catch basin can produce thousands of mosquitoes per week. The GTA's urban forest canopy also creates shaded, slow-draining areas in residential yards that hold water long enough for mosquito larvae to develop.
Professional mosquito control uses two approaches: larvicide treatment of standing water sources using Bacillus thuringiensis israelensis (Bti), a naturally occurring bacteria that kills mosquito larvae without harming humans, pets, or wildlife. And barrier spray application of residual insecticide to vegetation and shaded areas where adult mosquitoes rest during the day.
How It Works
What to expect when you work with licensed mosquito control professionals.
Inspection
The technician inspects the property for all mosquito breeding sources: clogged eavestroughs, plant saucers, tarps, wheelbarrows, bird baths, pond edges, low spots in the lawn, and catch basins. Every source found is treated with larvicide or flagged for drainage.
Treatment
Bti granules or briquettes are applied to standing water that cannot be drained: catch basins, ponds, decorative water features, and low areas. A residual insecticide is applied to vegetation, shrubbery, and shaded areas around the property perimeter where adult mosquitoes rest during the day.
Prevention
Treatments are scheduled every 4 weeks during mosquito season (May–September). Each treatment reduces the active mosquito population for 3–4 weeks. Starting in May, before the first generation establishes, is the most cost-effective approach.
Signs You May Need Mosquito Control
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Mosquitoes biting during daytime hours, not just at dusk — indicates a heavy local population
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Mosquitoes concentrated in specific areas of the yard: under decks, near garden beds, around water features
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Visible standing water that has not drained after 3–4 days
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Clogged eavestroughs or gutters holding stagnant water on the roofline
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Mosquito activity starting earlier in spring and lasting later into fall than in previous years
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Clusters of mosquitoes resting on the underside of deck railings and patio furniture during the day
Why Hire a Professional
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DIY mosquito foggers treat the air, not the source. Mosquitoes return within hours when the fog dissipates. Professional larvicide treatment addresses the actual breeding population.
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GTA properties near ravine systems have continuous mosquito pressure from natural breeding sites on public land. A professional treats the private property sources that homeowners miss.
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Barrier treatments by professionals use products with longer residual effect than retail alternatives, lasting 3–4 weeks instead of hours.
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Culex mosquitoes, the most common GTA species, can carry West Nile Virus. While the risk in Ontario is low, reducing mosquito populations is the only effective prevention.
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Professional mosquito programs include catch basin treatment, the single most effective intervention for reducing urban mosquito populations in the GTA.
Our Guarantee
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Free property inspection to identify breeding sources. Catch basin larvicide treatment included. Barrier spray reduces mosquito activity within 24 hours. Seasonal programs with monthly treatments from May through September.
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Free property inspection to identify breeding sources. Catch basin larvicide treatment included. Barrier spray reduces mosquito activity within 24 hours. Seasonal programs with monthly treatments from May through September.
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Mosquito Control Across the GTA
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