Lyme Disease in Ontario: What Toronto Residents Should Know About the Growing Tick Population

If you have noticed more talk about ticks in Toronto lately, you are not imagining it. Tick populations, particularly the blacklegged tick that can carry Lyme disease, have been steadily expanding across Ontario over the past several years, including in areas near the city. This does not mean you need to avoid the outdoors. It simply means it is worth understanding the basics, so you can enjoy Toronto's parks and trails with a bit of extra awareness.

Why are ticks becoming more common in Ontario?

Public health experts point to a combination of factors behind the growing tick population in Ontario, including milder winters and a warming climate, which allow ticks to survive and expand into areas where they were once rare. Blacklegged ticks, the species most associated with Lyme disease, have gradually expanded their range across southern Ontario, including into ravines, wooded parks, and green spaces closer to Toronto than in previous years.

This is a trend being monitored closely by Toronto Public Health and Public Health Ontario, and it is part of why awareness and simple precautions matter more today than they did a decade ago.

What is Lyme disease?

Lyme disease is an infection caused by bacteria that can be spread through the bite of an infected blacklegged tick. Not all ticks carry the bacteria, and a tick generally needs to be attached for a period of time, often cited as 24 hours or more, before it can transmit the infection. This is one of the reasons prompt tick checks and removal are such an effective form of prevention.

What are the symptoms of Lyme disease?

Symptoms of Lyme disease can vary, but a common early sign is a red, expanding rash at the site of the bite, sometimes described as looking like a bullseye, though it does not always appear this way and some people do not develop a rash at all. Other early symptoms can include fever, chills, headache, fatigue, and muscle or joint aches, often appearing within three to thirty days of a bite.

If Lyme disease is not treated, symptoms can become more serious over time, potentially affecting joints, the nervous system, or the heart. This is why paying attention to how you feel in the weeks after a tick bite, and seeking care if something feels off, is worth taking seriously.

Where in and around Toronto are ticks more commonly found?

Ticks tend to live in wooded areas, tall grass, and leaf litter, particularly where there is shade and moisture. Around Toronto, this includes many of the city's ravine systems, conservation areas, and trails, as well as popular weekend destinations outside the city like cottage country, the Niagara Escarpment, and areas around the Greenbelt. Ticks are not typically found on manicured lawns or paved paths, so sticking to the centre of trails when hiking can reduce your chances of brushing up against them.

How can I lower my risk when spending time outdoors?

A few simple habits make a real difference. Wearing light-coloured clothing makes ticks easier to spot, and tucking pants into socks reduces the chance of a tick reaching your skin. Using an insect repellent containing DEET or icaridin on exposed skin and clothing adds another layer of protection. Sticking to the centre of trails, rather than brushing through tall grass or bushes, also helps.

After time outdoors, doing a full body check is one of the most effective things you can do. Ticks are often small, sometimes no bigger than a poppy seed, so checking carefully, including your scalp, behind your ears, underarms, waistband, and behind your knees, is worth the extra few minutes. Showering soon after coming indoors can also help wash away any ticks that have not yet attached.

What should I do if I find a tick on my skin?

If you find an attached tick, removing it promptly and carefully lowers your risk significantly. Using fine-tipped tweezers, grasp the tick as close to the skin as possible and pull straight upward with steady, even pressure, avoiding twisting or crushing it. Clean the bite area afterward with soap and water or rubbing alcohol.

It can be helpful to note the date of the bite and, if possible, keep the tick in a sealed container or take a photo of it, in case a healthcare provider wants this information later. If you are unsure how to remove a tick safely, a pharmacist, walk-in clinic, or Health Connect Ontario at 811 can help guide you through it.

When should I see a healthcare provider after a tick bite?

Most tick bites do not lead to Lyme disease, and many people who find and remove a tick promptly will not need any specific treatment. That said, it is worth contacting a healthcare provider if you develop a rash, fever, or flu-like symptoms in the weeks following a tick bite, if the tick was attached for an extended period, or if you are simply unsure and want peace of mind. A walk-in clinic or your family doctor can assess the situation and let you know if any further steps are needed.

A note for parents and pet owners

Kids and pets often spend more time in the kind of environments where ticks are found, whether that is running through tall grass at a conservation area or exploring off the main path on a family hike. Making tick checks part of the routine after outdoor time, for both children and pets, is one of the simplest ways to catch a tick before it has a chance to attach for long. Pets can also carry ticks into the home on their fur, so checking your dog after a walk in a wooded area is worth doing, and your veterinarian can recommend tick prevention products suited to your pet. If your child develops a rash or unexplained symptoms after time outdoors this summer, mentioning any recent tick exposure to their healthcare provider is helpful context.

Key tips for managing tick risk in Toronto this summer

• Dress smart: Light colours and tucked-in pants make ticks easier to spot.
• Use repellent: DEET or icaridin based repellents add real protection.
• Stick to trails: Avoid brushing through tall grass or dense brush.
• Check thoroughly: A full body check after outdoor time is one of the most effective habits you can build.
• Remove ticks properly: Fine tweezers, steady upward pressure, no twisting.
• Watch for symptoms: A rash, fever, or flu-like symptoms in the weeks after a bite are worth having checked.

The growing tick population in Ontario is a good reminder to build a few simple habits into your summer routine, not a reason to stay indoors. With a bit of awareness, Toronto's trails, ravines, and green spaces remain a wonderful part of the season.

This article is for informational purposes only and does not replace professional medical advice.