“It’s Too Cold for Ticks” — Why This Lyme Myth Is Dangerous

When one of my patients developed Lyme disease symptoms in January, she was told, “It’s too cold for ticks — it can’t be Lyme.”

That statement is one of the most common and dangerous Lyme disease misconceptions in tick-borne illness. The phrase “too cold for ticks” contributes to missed winter diagnoses every year.

The truth is simple: it is rarely truly too cold for ticks.

Whenever temperatures rise above freezing, ticks can become active. Blacklegged (deer) ticks don’t die off in winter—they go dormant, then re-emerge as soon as conditions allow.

Is It Really Too Cold for Ticks?

Ticks don’t follow calendars.

Research shows that deer ticks can remain active at temperatures as low as 35–40°F, surviving winter months beneath leaf litter, brush, and snow cover.

The Centers for Disease Control and Prevention notes that blacklegged ticks can become active during winter warm spells when temperatures rise above freezing.

They are most active in fall and early spring, but during mild winters they may emerge in January or February. In southern regions, tick activity can continue year-round.

In simple terms: ticks don’t disappear in winter—they wait for warmer moments.

Why the “Too Cold for Ticks” Myth Matters

Believing it’s too cold for ticks can lead directly to delayed diagnosis and missed cases of Lyme disease.

Every winter, patients are told their symptoms can’t be Lyme because of the season—only to be diagnosed months later, when treatment becomes more complicated and symptoms have spread.

If you’ve had outdoor exposure—even routine activities like dog walking, yard work, wood cutting, or hiking—the season alone should never rule out Lyme disease.

This misconception may contribute to delayed recognition and incomplete evaluation of Lyme disease symptoms.

The Science Behind Winter Tick Survival

Ticks are remarkably resilient.

Studies show:

• Nymph and adult deer ticks can survive weeks of subfreezing temperatures
• Leaf litter, snow cover, and moisture create insulation that helps prevent lethal cold exposure
• On sunny winter days above approximately 40°F, ticks resume “questing”—climbing vegetation to search for a host

That’s why tick checks matter all year, not just during summer.

Key Takeaway

It is not too cold for ticks—even in February.

Ticks can become active anytime temperatures rise above freezing, and Lyme disease can begin with one unnoticed bite, even during winter months.

Year-round awareness is essential for preventing chronic Lyme disease.

If symptoms follow outdoor exposure, Lyme disease should remain on the diagnostic radar regardless of the month.

Frequently Asked Questions

Is it ever too cold for ticks?
Ticks become dormant during freezing temperatures but do not die off. They can become active whenever temperatures rise above approximately 35–40°F, even during winter.

Can you get Lyme disease in winter?
Yes. If a tick is active and infected, it can transmit Lyme disease regardless of the season.

When are ticks most active?
Peak activity is typically spring and fall, but ticks can remain active year-round during mild weather or winter warm spells.

Should I do tick checks in winter?
Yes—especially after outdoor activities on warmer winter days. Tick checks should remain a year-round habit.

What should I do if I’m told it’s the wrong season for Lyme disease?
If you have symptoms consistent with Lyme disease and a history of outdoor exposure, the season alone should not rule out further evaluation. Consider seeking additional medical assessment if concerns persist.

Related Reading (Dr. Daniel Cameron)

• Where Ticks Live
• Surviving Winter
• Ticks Can Survive a Northern Winter. But Can Ticks Survive a Southern Summer?
• Common Lyme Disease Misconceptions
• Delayed Lyme Disease Diagnosis

Dr. Daniel Cameron, MD, MPH
Lyme disease clinician with over 30 years of experience and past president of ILADS.

Symptoms • Testing • Coinfections • Recovery • Pediatric • Prevention