Tick Season: Is There Really an Off Switch?

Tick Season: Is There Really an Off Switch?

Why Canada's changing climate, autumn tick activity, and winter weather are challenging the idea of a traditional tick season.

Published October 19, 2026 | Paw Privileges / Paw Rewards

Recently, I spoke with a pet industry company that caught me a little off guard.

When we discussed collaboration opportunities, they told me they were entering their "off-season." When I addressed that, the response was yes, just our 'collaboration", i.e., marketing is in off-season.

Their off-season?

For a company operating in the tick prevention and awareness space, that response raised an important question.

Does the tick industry really have an off-season in Canada?

From a business perspective, I understand seasonal sales, marketing budgets, and campaign schedules. Companies plan their calendars around periods of peak consumer demand.

But ticks don't follow marketing calendars.

And in Canada, where temperatures can fluctuate dramatically throughout autumn and winter, the idea that tick awareness simply switches off when summer ends is increasingly difficult to defend.

The research is detailed: ticks can remain active well beyond summer, including during periods of mild winter weather.

For an industry whose products, services, and educational messaging are built around parasite protection, understanding that distinction matters.

It's time we stopped talking about tick season as though someone flips a switch on September 30.

When Is Tick Season in Canada?

Traditionally, tick season has been associated with spring and summer. These are certainly important months for tick exposure, especially as Canadians return to hiking trails, parks, campgrounds, cottages, and other outdoor spaces.

But the biology of ticks tells a more complicated story.

Different species and life stages have different activity patterns.

In Canada, the blacklegged tick (Ixodes scapularis), commonly called the deer tick, is particularly important because it can transmit the bacterium responsible for Lyme disease.

Adult blacklegged ticks are often active during spring and autumn, making October and November important months for prevention and awareness.

In fact, according to the Public Health Agency of Canada's national tick surveillance findings from 2022, the greatest numbers of blacklegged tick submissions occurred during April through June and October through November.

That's worth repeating.

October and November are not simply the tail end of tick season. They are among the significant periods for blacklegged tick activity documented in Canada.

Source: Public Health Agency of Canada — Tick Surveillance in Canada, 2022

The 4°C Rule: Why the First Frost Doesn't End Tick Activity

One of the biggest misconceptions about ticks is that cold weather kills them.

It doesn't necessarily.

The Canadian Veterinary Medical Association explains that certain ticks can become active when temperatures reach approximately 4°C.

Ontario's Ministry of Health goes even further, noting that ticks can be found at any time of year when temperatures rise above freezing.

This distinction matters. The 4°C figure is a useful public awareness guideline, not an absolute biological cutoff. Tick behaviour depends on the species, local habitat, temperature, and environmental conditions.

Consider a typical Southern Ontario winter.

Monday might bring snow and freezing temperatures. By Thursday, the temperature could rise to 6°C, with patches of exposed grass, damp leaves, and thawing soil.

To us, that might simply feel like a welcome break from winter.

To a blacklegged tick sheltered in a suitable habitat, it may provide an opportunity to become active and search for a host.

A hard frost is not a guarantee that tick exposure has ended. Neither is the arrival of December, January, or February.

Sources: Canadian Veterinary Medical Association — National Tick Awareness Month and Ontario — Tick-Borne Diseases.

The Numbers: What Canadian Tick Surveillance Actually Shows

We don't need to rely on anecdotes to demonstrate that ticks remain an important public health concern.

Canada's surveillance numbers tell an important story.

Reported Lyme Disease Cases Continue to Rise

According to the Public Health Agency of Canada:

Between 2023 and 2024 alone, reported cases increased approximately 21.4%.

And preliminary figures for 2025 indicate that reported cases rose further.

These are human surveillance statistics, not cases in dogs. They demonstrate the growing importance of tick-borne disease surveillance across Canada, but they should not be interpreted as a direct measure of canine infection rates.

Changes in reporting, case definitions, testing, and surveillance also need to be considered when comparing years.

Nevertheless, the increasing burden of reported Lyme disease reinforces why ongoing prevention and education matter.

Source: Public Health Agency of Canada — Lyme Disease Monitoring.

What About Fall and Winter?

The 2024 national Lyme disease surveillance report recorded the following numbers among cases with known illness onset dates:

That's 156 recorded cases with illness onset during October and November, and another 57 during December, January, and February.

There is an important scientific distinction here: the date someone first experiences Lyme disease symptoms does not necessarily indicate the month they were bitten. Symptoms can begin after the original exposure.

Therefore, these figures should not be presented as proof that every winter case resulted from a winter tick bite.

They do, however, demonstrate why Lyme disease awareness should not disappear from public discussion outside the traditional summer season.

For direct evidence of autumn tick activity, the national tick surveillance submission data is especially compelling.

Sources: Vector-Borne Disease Surveillance in Canada, 2024 and Tick Surveillance in Canada, 2022.

Why Fall May Be One of the Most Overlooked Tick-Risk Periods

When we think of tick prevention, we often picture warm summer hikes, long grass, and wooded trails.

But autumn creates its own conditions for tick exposure.

Adult blacklegged ticks are active during fall, searching for hosts before winter conditions limit their movement.

Meanwhile, Canadians are taking advantage of cooler weather and spectacular autumn scenery.

We're hiking through conservation areas, taking our dogs on woodland adventures, visiting provincial parks, walking along lakeshores, and exploring trails covered in fallen leaves.

Those adventures are wonderful. They are exactly the type of outdoor activities we encourage through Paw Rewards.

But they also present opportunities for tick exposure.

Where Are Ticks Found in Autumn?

Ticks can be encountered in:

• Wooded and brush-covered trails

• Leaf litter and forest edges

• Long grass and overgrown vegetation

• Parks and conservation areas

• Rural properties and cottage areas

• Gardens and landscaped yards near suitable tick habitat

A dog doesn't need to disappear into a forest to encounter a tick.

Exposure can happen during an ordinary neighbourhood walk where suitable habitat exists.

And because ticks are small, painless when they bite, and sometimes difficult to see beneath a dog's coat, owners may not notice them immediately.

This is why fall tick awareness deserves its own place in Canadian pet health education.

Not as a leftover summer message.

As a meaningful seasonal priority.

Do Ticks Survive Canadian Winters?

Yes. Certain ticks, including blacklegged ticks, have adaptations that allow them to survive periods of cold weather.

Rather than disappearing when temperatures fall, ticks may become inactive and shelter in protected environments.

Leaf litter, ground-level vegetation, and snow cover can provide insulation from extreme surface temperatures.

When conditions become favourable again, surviving ticks may resume activity.

Of course, this doesn't mean tick activity is equally high throughout every winter.

Extended periods of severe cold can reduce activity considerably. Tick risk varies by geography, habitat, weather, species, and season.

A mild December in Southwestern Ontario is different from a sustained deep freeze in Northern Manitoba.

But the key takeaway is simple.

Reduced activity is not the same as zero activity.

And that is exactly why the phrase "tick season is over" can create a false sense of security for dog owners.

Not All Ticks Follow the Same Calendar

Canada has several tick species, and treating them all as though they share identical activity patterns is another common mistake.

Blacklegged Tick (Deer Tick)

Ixodes scapularis

One of the most significant species for Lyme disease transmission in Eastern and Central Canada.

Adult blacklegged ticks are particularly important during spring and autumn and may be active on mild winter days.

American Dog Tick

Dermacentor variabilis

Commonly encountered during warmer months in parts of Canada.

Its activity is generally more seasonal, often peaking in spring and early summer. It is not considered a principal vector of Lyme disease.

Western Blacklegged Tick

Ixodes pacificus

Found primarily in British Columbia and along parts of the Pacific coast.

Its ecology and seasonal activity patterns differ from those of the eastern blacklegged tick.

These differences matter when developing regionally relevant educational campaigns.

Canada is a large country. There is no single tick calendar that accurately represents every province, species, or habitat.

A responsible Canadian prevention message must reflect local conditions rather than a one-size-fits-all seasonal campaign.

What Does This Mean for Dogs?

For dog owners, the practical takeaway is straightforward.

Don't assume that your dog's tick exposure ends when summer does.

Dogs explore the world differently from humans.

They investigate grass, bushes, leaf piles, wooded trails, and the edges of paths where ticks may be waiting for a host.

And while tick-borne diseases such as Lyme disease and anaplasmosis can affect dogs, not every tick bite leads to an infection.

Risk depends on the tick species, whether it carries a pathogen, attachment duration, and other factors.

Recognizing Potential Signs of Tick-Borne Illness

Depending on the disease, possible symptoms in dogs may include:

• Fever

• Lethargy or unusual fatigue

• Reduced appetite

• Lameness or joint discomfort

• Swollen or painful joints

• Changes in mobility or behaviour

Many exposed dogs show no obvious signs, and these symptoms can have numerous causes unrelated to ticks.

Any concerning symptoms should be evaluated by a veterinarian.

How to Protect Your Dog During Fall and Winter

The answer isn't to stop exploring. Our dogs benefit enormously from outdoor activity, enrichment, exercise, and time spent experiencing the world with us.

The answer is to remain aware and take sensible precautions.

1. Check Your Dog After Outdoor Adventures

Make tick checks part of your routine, especially after walks through woodland, brush, or long grass.

Pay special attention to the ears, collar area, neck, armpits, groin, belly, and between the toes.

For dogs with long or dense coats, use your fingers to feel carefully through the fur.

2. Discuss Tick Prevention With Your Veterinarian

Ask your veterinarian about appropriate tick prevention based on your dog's individual risk, age, health, lifestyle, and geographic location.

In areas with established tick populations and recurring periods of mild weather, year-round prevention may be appropriate.

Preventive products differ in how they work, which ticks they target, how long they remain effective, and whether they repel ticks or kill them after contact.

No preventive product should replace regular tick checks.

3. Remove Attached Ticks Promptly

If you find an attached tick, use a suitable tick-removal tool or fine-point tweezers.

Grasp the tick close to the skin and remove it using steady, controlled traction.

Avoid burning, squeezing, or smothering the tick with oils, petroleum jelly, or other substances.

If you have difficulty removing it, or your dog develops symptoms, contact your veterinarian.

4. Know Your Local Risk

Check public health resources for your province or region.

Ontario's established blacklegged tick risk areas continue to be monitored, and ticks may be encountered outside mapped locations.

Remember that dogs travel with us. Cottage weekends, road trips, and adventures in other provinces can introduce different exposure risks.

5. Make Tick Awareness a Habit, Not a Season

Perhaps the most important step is changing how we think about prevention.

A tick check after an autumn walk should be as routine as checking paws for ice and road salt during winter.

We don't have to be frightened of the outdoors to be responsible.

We simply have to understand the risks.

A Message to the Canadian Pet Industry: Your Marketing Calendar Isn't Nature's Calendar

This brings me back to the conversation that inspired this article.

A company operating in the tick-related industry described this time of year as its "off-season."

And that genuinely surprised me.

There is absolutely a difference between a company's commercial off-season and a period of low or nonexistent tick activity.

Businesses may experience lower demand during winter. They may run their largest promotional campaigns during spring. They may organize staffing, budgets, and product launches around predictable retail trends.

All of that is understandable.

But a business having an off-season does not mean ticks have one.

When companies working in parasite prevention or awareness communicate with Canadian dog owners, that distinction deserves attention.

Canadian pet owners need information that reflects Canada's actual environment.

They need to understand that an October hike can carry tick exposure risk.

That an unusually mild November isn't necessarily a break from prevention.

That a January thaw can create conditions where ticks become active again.

And that a dog walking through Southern Ontario in late autumn lives in a very different risk environment than one walking through an area experiencing months of sustained deep-freezing temperatures.

The Opportunity for Canadian Pet Brands

Instead of treating tick awareness as a spring-only marketing initiative, imagine what a genuinely Canadian approach could look like.

Spring: Education about emerging activity, nymphs, and prevention planning.

Summer: Trail safety, travel awareness, tick checks, and outdoor adventures.

Fall: Adult blacklegged tick activity, woodland walks, leaf litter, and continued vigilance.

Winter: Mild-weather alerts, regional risks, and understanding why frost doesn't automatically eliminate exposure.

That's not about selling more products.

It's about supporting informed, responsible dog ownership with accurate, timely information.

And from my perspective, that's exactly what companies operating in the Canadian pet industry should be working toward.

At Paw Rewards, Adventures Don't Stop When the Seasons Change

One of the reasons I created Paw Rewards was to encourage dog owners to build positive habits with their dogs.

Walking, training, exploring, and discovering new places aren't activities that should end because summer is over.

Canada is beautiful in every season.

Autumn forest trails, snow-covered parks, crisp winter walks, and early spring adventures all offer opportunities to connect with our dogs and create memories.

But responsible ownership means adapting our routines as conditions change.

Sometimes that means protecting paws from road salt.

Sometimes it means adjusting exercise during extreme heat.

And sometimes it means checking for ticks after a woodland walk in November, even though we thought tick season was over.

Paw Rewards celebrates outdoor adventures, but we also believe that education is an important part of helping owners make informed decisions.

The goal isn't to stop the adventure. It's to make every adventure a little safer.

Frequently Asked Questions About Tick Season in Canada

Is there an off-season for ticks in Canada?

There are periods when tick activity is significantly reduced, especially during sustained freezing weather. However, there is no universally reliable tick-free season across Canada. Some tick species can become active during mild winter conditions.

What temperature do ticks become active?

Certain species, including blacklegged ticks, can be active at approximately 4°C. Ontario also advises that ticks can be found whenever temperatures rise above freezing. Neither figure is an absolute cutoff.

Are ticks active in October and November?

Yes. Federal tick surveillance has identified October and November as significant months for blacklegged tick submissions in Canada. Adult blacklegged ticks are particularly relevant during autumn.

Can dogs get ticks in December or January?

Yes, particularly during mild winter weather in areas where ticks are established. Activity is generally lower during sustained freezing conditions, but winter does not guarantee zero exposure.

Does snow kill ticks?

Not necessarily. Ticks may survive cold conditions in protected habitats, including beneath insulating leaf litter and snow. Snow cover should not be considered proof that ticks have disappeared.

Should dogs receive tick prevention year-round in Canada?

That depends on geography, individual exposure, and the dog's health. In some Canadian regions, year-round prevention may be appropriate. Speak with your veterinarian about a plan suited to your dog.

Can ticks transmit Lyme disease during winter?

An infected tick that is active and attaches to a host may create an opportunity for transmission, including during favourable winter weather. Risk depends on factors such as the species of tick, infection status, and attachment duration.

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

Remove it promptly and carefully, record where and when it was found, and monitor your dog. Consult your veterinarian about identification, disease risk, and any necessary follow-up.

Final Thoughts: There Is No Universal Off Switch

Ticks have seasonal patterns. Their behaviour changes with temperature, species, geography, and habitat.

Nobody is suggesting that Canadian tick activity is identical in January and June.

It isn't.

But the notion that tick awareness can simply be packed away at the end of summer doesn't reflect what we know about blacklegged ticks in Canada.

Our climate is variable. Our dogs are outdoors year-round. And the evidence tells us that autumn and even periods of winter can present opportunities for tick exposure.

So perhaps it's time to rethink the entire conversation.

Rather than asking when tick season ends, we should be asking when and where ticks are active, what conditions increase exposure, and how we can keep our dogs protected throughout the year.

Because nature doesn't follow a company's marketing calendar.

And responsible dog ownership shouldn't depend on one, either.

Keep exploring. Keep learning. Keep making memories.

— Paw Privileges | Paw Rewards

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Research and References

1. Public Health Agency of Canada — Lyme Disease Surveillance

2. Public Health Agency of Canada — Vector-Borne Disease Surveillance, 2024

3. Public Health Agency of Canada — Tick Surveillance, 2022

4. Ontario Ministry of Health — Tick-Borne Diseases

5. Canadian Veterinary Medical Association — National Tick Awareness Month

6. Public Health Agency of Canada — Preventing Tick Bites

7. Public Health Agency of Canada — Removing a Tick

Educational disclaimer: This article is intended to support general awareness and responsible pet ownership. It does not replace individualized veterinary advice or current provincial public health guidance.