Climate change is causing ticks to move into new areas in southern Canada, with experts predicting a continued expansion of these blood-sucking pests. Ticks carrying diseases were not a concern in Canada until the 1990s, but various species have been migrating north from the United States at a speed of 35 to 55 kilometers annually. According to Katie Clow, an assistant professor at the University of Guelph, regions in southern Canada currently unaffected by ticks are likely to witness their emergence within the next ten years.
The introduction of Lyme disease in southern Ontario in 1989, transmitted by blacklegged ticks or deer ticks, marked the beginning of the spread of these ticks across the provinces. Alberta and Saskatchewan have also reported sightings of these disease-carrying ticks. Health Canada states that Canada now hosts over 40 tick species, some of which pose significant health risks. The lone star tick, known to induce a severe red meat allergy in humans, and the Asian longhorned tick, which can cause diseases in cattle, are among the concerning species.
Researchers express concerns that these tick species will establish themselves in Canada sooner rather than later. The rise in Lyme disease cases and tick infestation in various regions indicates the increasing presence of ticks across the country. The Public Health Agency of Canada has reported a significant surge in Lyme disease cases over the past decade, with 7,105 cases recorded in 2025 compared to 144 cases in 2009.
The proliferation of ticks in Canada has surprised many, with some attributing their spread to unfounded theories of aerial dispersal. However, researchers emphasize that climate change has been the primary driver of the tick population’s growth. Ticks’ ability to survive and thrive in new environments is largely influenced by changing climate patterns, allowing them to reproduce and establish sustainable populations year-round.
As tick populations continue to rise, Canadians are advised to take precautions when engaging in outdoor activities. Implementing preventive measures such as managing landscapes, wearing protective clothing, and using insect repellents can help reduce the risk of tick bites. Regular tick checks and proper clothing maintenance, like washing and drying clothes after outdoor activities, are recommended to mitigate the potential health risks associated with tick exposure.
