Spring is the season for Blackflies & Mosquitoes!
Canada is home to 161 species of blackfly that have different life cycles with the majority flying as adults during the spring. In Algonquin Park & much of Northern Ontario, blackflies species that are of interest to visitors are flying as adults by mid-May (depends on the weather in any given year) and are usually present until late June. Blackflies seem to be most abundant on hot, humid spring days, but are normally common throughout this mid-May to late June flight period.
Mosquitoes are abundant, beginning in mid to late May and last longer than blackflies (usually into July). Mosquitoes are most often a problem in cooler, shady parts of the forest, as well as in the evening, and into the first couple of hours of darkness. They become less of a problem through the night (although they do not disappear entirely).
How to Prepare Yourself
West Nile Virus
West Nile virus is established in Ontario. The disease is transmitted to humans by mosquitoes. There is no way to predict how serious West Nile virus will be in any given year. It's important you take steps that will protect you and your family from mosquito bites.
Posted by Ontario Ministry of Health on June 05, 2014