Toronto’s tick surveillance program monitors the number of blacklegged ticks, their locations, and the number of them that carry the bacteria that causes Lyme disease. This information helps to determine the overall risk of Lyme disease in Toronto.

The tick surveillance program consists of ticks brought in by the public and ticks found by dragging.

Tick dragging is a process of collecting ticks in the environment and is done in the spring and fall when adult ticks are active. Dragging locations are selected based on suitable blacklegged tick habitat or a previous confirmed finding of a blacklegged tick. Blacklegged ticks may still be present in very low numbers at a site where none were found by tick dragging efforts.

Active Tick Surveillance Map

Tick dragging locations and results are available on the active tick surveillance map. Please note: the technology to convert this map to an accessible format is not currently available. These maps may not be compatible with screen reader software. If you are unable to access this map, please contact

The map will be updated in the spring and fall when tick dragging is completed and laboratory results are received from the National Microbiology Laboratory. Because blacklegged ticks are known to be established at Algonquin Island, Highland Creek, Morningside Park, Toronto Hunt Club and Rouge Valley Park, Toronto Public Health will continue to monitor numbers and infectivity rates at these locations less frequently. Tick dragging results from 2013 to 2017 are also listed below.

Ticks are found in wooded or bushy areas with lots of leaves on the ground or where there are tall grasses. As tick populations are expanding, it is possible that blacklegged ticks could be present outside the areas identified by Toronto Public Health. In addition, ticks can travel or migrate on the bodies of animals such as birds, and therefore can be present in an area for a year in very low numbers and then disappear.