Ontario Lyme Disease Cases Hit Record High — Summer 2026 Tick Alert

Quick answer: Ontario confirmed a record 3,614 Lyme disease cases in 2025 — up 19% from 2024 and roughly 30 times the 2010 count, according to Public Health Ontario. Blacklegged ticks are now established across the GTA, not just cottage country. This summer, a tick-free yard is the standard, and Sani IQ treats Ontario properties to keep it that way.

If you have been treating ticks as a “cottage country” problem, the latest Ontario numbers retire that idea. Lyme disease cases in the province have climbed to a record high, and the blacklegged ticks that carry it are now established in the same suburban backyards where your kids and dogs play. This is a timely alert for GTA homeowners: the risk has moved into the city, and the most controllable part of it is your own property.

What’s happening / What to do

How bad is Ontario’s tick problem in 2026?

It is at a record level. Public Health Ontario confirmed 3,614 Lyme disease cases in 2025, a 19% jump from 3,032 in 2024 and roughly a 30-fold increase from the 119 cases recorded in 2010. The provincial case rate is now around 23 per 100,000 residents.

Just as important as the count is the map. Areas considered low-risk only a few years ago — including parts of York Region, Halton Region and Simcoe County — now have established blacklegged tick populations and confirmed local Lyme cases. For GTA and Simcoe homeowners, the takeaway is simple: this is no longer somebody else’s problem.

Why are ticks a backyard problem now, not just a trail problem?

Because blacklegged ticks have spread into the leafy, shaded, suburban landscapes most homes back onto. Ticks do not fly or jump; they wait on grass tips and low brush at yard edges and latch onto whatever brushes past — a dog, a child, you.

That means the highest-risk zone is often the boundary of your own property: the shaded fence line, the leaf litter under trees, the long grass where the lawn meets the woods or a ravine. It is exactly the part of the yard people stop maintaining, and exactly where ticks thrive.

Can I handle ticks in my yard myself, or do I need a professional?

You can take meaningful steps yourself — mowing, clearing leaf litter, and creating a barrier between lawn and woods all reduce tick habitat. But yard maintenance reduces the habitat; it does not clear the ticks already living in it. Consider the trade honestly.

For a busy household, the question is less “can I” and more “is my weekend the best tool for this.” Yard treatment is quoted per property by size and layout — see our plans and pricing and our tick control cost guide for ranges.

What GTA homeowners should do this summer

1. Stop assuming your area is low-risk. If you are in the GTA, York, Halton or Simcoe, treat ticks as present.
2. Walk your yard edges. Note shaded fence lines, leaf litter, and where lawn meets brush — that is the tick zone.
3. Keep grass short and clear leaf litter to shrink the habitat, especially along borders and under decks.
4. Do daily tick checks on kids and pets after time outdoors; ticks are tiny and easy to miss.
5. Book a professional yard tick treatment so the shaded edges are actually cleared, not just mown.

These are prevention and what-to-check steps. If you find an embedded tick on a person, follow current medical guidance for safe removal and watch for symptoms — and if in doubt, contact your health provider.

Why Sani IQ

Sani IQ is a licensed, Ontario-based pest-control company using science-based integrated pest management (IPM) and real local knowledge of where ticks actually live on GTA and Simcoe properties — backed by 100+ five-star reviews. We treat the shaded yard edges most homeowners cannot reach, and we stand behind the result with our “Pest-Free, OR It’s Free” guarantee. Explore our residential pest control service for full-property protection.

The bottom line

A record 3,614 Lyme cases and ticks established across the GTA make this a season to act, not watch. The part you control is your own yard — and a tick-free yard should be the standard, not a hope. Book a treatment, do your daily checks, and enjoy your summer outside. Call Sani IQ at (705) 302-1887 or request a quote at our contact page. We protect homes across the GTA and Simcoe, including Vaughan, Markham and Richmond Hill.

Frequently asked questions

How many Lyme disease cases did Ontario have in 2025? Public Health Ontario confirmed 3,614 Lyme disease cases in 2025 — a record. That is up about 19% from 3,032 cases in 2024 and roughly 30 times the 119 cases reported in 2010. The provincial rate is now around 23 cases per 100,000 residents.

Are there ticks in the GTA, or only up north? Both. Blacklegged ticks are now established across much of southern Ontario, including parts of York, Halton and Simcoe that were considered low-risk only a few years ago. For GTA homeowners, ticks are a local backyard risk, not just a cottage-country one.

When are ticks most active in Ontario? Ticks are active through the warm months, with nymphs — the tiny, hard-to-spot stage tied to most Lyme transmission — peaking in late spring and early summer, and adults active into fall. In practice, that means tick checks and yard protection matter all season long.

Does a yard tick treatment actually work? A professional barrier treatment targets the shaded edges and leaf litter where ticks live, killing ticks already present rather than only reducing habitat. Combined with mowing and leaf removal, it meaningfully lowers the ticks on your property. Sani IQ backs treatment with a “Pest-Free, OR It’s Free” guarantee.

What should I do if I find a tick on my child or pet? Remove it promptly and carefully following current medical guidance, keep the tick if you can, and watch for symptoms such as a rash or fever. When in doubt, contact your health provider. Reducing ticks in the yard lowers the odds of getting to that point at all.