Canada's Mosquito Boom: What This Summer's Wet Weather Means for Your Yard

By Ron Alfred De Guzman, MaxWell Realty Insights | July 03, 2026

A wet spring and early summer have driven mosquito populations up across much of Canada, and the data confirms it. Alberta isn't the only province affected.

The numbers, coast to coast

Alberta recorded one of its wettest Junes on record. Edmonton logged nearly 187 millimetres of rain, almost double its normal amount. Trap counts jumped from five mosquitoes on May 23 to 534 by June 20. The following week, average counts reached 3,753 per trap, an increase of more than 1,200 percent in seven days.

Saskatchewan follows close behind. Mosquito counts are running roughly ten times higher than last year, and populations have peaked well above the ten-year average.

Ontario and Quebec experienced their own cool, wet spring, which left behind the standing water that fuels mosquito breeding. BC saw a similar surge tied to spring flooding and rapid snowmelt. Forecasters expect this pattern to shift through July: the Prairies should trend drier, while southern Ontario and Quebec continue seeing wet weather. Different regions may take turns facing peak mosquito activity as summer progresses.

Rain drives the boom nationwide. Mosquito eggs can lie dormant for up to a decade, waiting for rain to activate them. Several dry years had depleted egg banks across the country, and this year's rainfall gave them exactly what they needed to hatch.

Why it matters for your yard

Standing water breeds mosquitoes and hurts curb appeal, regardless of province. Birdbaths, clogged eavestroughs, uncovered rain barrels, and low spots that hold puddles create the biggest problems.

A few quick fixes:

• Empty or cover birdbaths and rain barrels weekly
• Clear clogged eavestroughs
• Address low spots that hold water after rain
• Schedule showings midday, when mosquitoes are least active
• Consider a screened porch for buyers who value outdoor living

The takeaway

This year's mosquito surge affects the whole country. A wet spring touched Alberta, Saskatchewan, Ontario, Quebec, and BC alike. Wherever you buy or sell, a bit of yard maintenance keeps both the bugs and buyers' first impressions in check.

Sources: CBC News, Global News, CTV News, Red Deer Advocate, University of Saskatchewan, City of Calgary, Culture Alberta.