Where are mosquitoes the worst in Canada?

Where mosquitoes are worst in Canada includes northern regions, prairie provinces, and areas with abundant standing water, swamps, and boreal forest, with worst mosquito pressure typically in Manitoba, Saskatchewan, northern Ontario, northern Quebec, and territories. Winnipeg, Manitoba is often cited as having worst mosquitoes in Canada due to its location near Red River, flat prairie with many potholes that hold water after snowmelt, warm summers, and large mosquito species like Culex tarsalis that breeds in large numbers, leading to nickname Mosquito Capital. Northern Canada, including Yukon, Northwest Territories, and Nunavut, has extremely high mosquito numbers in summer despite cold winters, because tundra has millions of shallow pools after snowmelt that produce huge hatches of mosquitoes that swarm in June and July, making outdoor activity difficult without head nets. In Ontario, areas around Algonquin Park, cottage country, and northern Ontario swamps have worst mosquitoes. In Quebec, northern boreal forest and areas around James Bay are worst. Coastal British Columbia has fewer mosquitoes due to ocean breeze, but interior BC wetlands have many. In Atlantic Canada, areas with marshes have heavy mosquitoes. Worst months are June through August, with peak in July after snowmelt and rains create breeding sites. Mosquitoes carry West Nile virus in southern Canada, more common in prairies.