Mosquito season in Canada typically begins between mid-April and early June, depending on where you live. The first big “hatch” happens shortly after temperatures consistently rise above 10°C, especially after rainfall or snowmelt.
Here's a breakdown of the mosquito season start dates for the different provinces of Canada
| Province/Territory | Season Starts | Peak Activity | Notes |
|---|---|---|---|
| British Columbia | Late April – Early May | June – Mid-July | Fewer mosquitoes on the coast; inland areas get more intense |
| Alberta | Early – Mid May | June – Early August | Heavy after snowmelt; especially in rural areas |
| Saskatchewan | Mid May | Late June – August | Large hatches after rain in prairie wetlands |
| Manitoba | Late April – Mid May | June – August | Infamous for intense mosquito activity near lakes and rivers |
| Ontario (South) | Late April – Early May | May – July | Mosquitoes thrive in cottage regions and wetlands |
| Ontario (North) | Mid May | June – July | Cooler spring delays start slightly |
| Quebec | Late April – Early May | June – July | Flood zones near rivers hatch early; humid summers boost activity |
| New Brunswick | Mid May | June – July | Forested and swampy = lots of bugs |
| Nova Scotia | Mid May | June – Early August | Inland areas worse than coastal towns |
| Prince Edward Island | Mid – Late May | June – July | Short season, but can be intense |
| Newfoundland & Labrador | Late May – Early June | June – August | Boggy inland zones attract clouds of mosquitoes |
| Yukon / NWT / Nunavut | Late May – June | June – August | Northern areas have huge swarms in midsummer |
What Triggers Mosquito Season in Canada?
Mosquitoes hibernate or overwinter as eggs or larvae, waiting for a few key things:
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Temperatures above 10°C for several days
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Snowmelt and rainfall to create standing water
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Sunlight to warm up breeding zones
Their eggs hatch rapidly in puddles, ditches, gutters, and marshes. Some species can go from egg to biting adult in under a week.
How to Prepare for Mosquito Season
Start prepping by mid-April, especially if you're in central or eastern Canada, where mosquitoes can arrive early and in overwhelming numbers.
Your Pre-Mosquito-Season Checklist:
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Remove standing water (buckets, gutters, flowerpots)
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Repair or install screens on windows and doors
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Keep lawns trimmed and yards tidy
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Stock up on long-lasting mosquito repellent
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Treat outdoor areas before the first hatch
Want season-long mosquito protection done right?
Stop Moustiques offers professional mosquito protection services designed for Canadian homes and outdoor spaces in the province of Quebec.
Book your seasonal treatment now to enjoy a bite-free summer.
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