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ticks — where they go in a New Hampshire winter
Winter: PARTIAL
Daniel Brady · NH-Licensed Pesticide Applicator · License #782664
Reviewed by Daniel Brady

Where Do Ticks Go In The Winter?

Winter quiets it — but does not end it, and this is a safety issue
Blacklegged (deer) ticks do not die in a New Hampshire winter — they retreat into leaf litter and forest duff at the edges of your yard, where ground-level temperatures stay milder than the open air, and enter a temperature-controlled inactive state called quiescence. That is not hibernation and not a fixed seasonal sleep: the moment the air warms above roughly 40°F and the ground isn't snow-covered, adult ticks resume host-seeking the same day. Manchester's own winter climate crosses that threshold routinely — December highs commonly run into the upper 30s and low 40s, and by late February the average daily high is back near 39°F — so "winter is a tick break" is not a safe assumption in New Hampshire, and this is the one page in this hub where that correction is a genuine public-health issue, not trivia.

At a glance

  • Winter’s effect: Winter quiets it — but does not end it, and this is a safety issue
  • Where they go: Leaf litter and duff
  • How far: In your yard
The honest answer

The short of it

The verdict
Winter quiets it — but does not end it, and this is a safety issue

Blacklegged ticks are not killed by cold. They go quiet below about 40°F and quest again the moment it warms — including on a New Hampshire winter thaw.

The one question nobody else answers

Does winter actually help you?

Every reader assumes the answer is yes — that winter is a break. For the pests that matter most in a New Hampshire home, it is the opposite. Here is where this one lands.

The winter switch
Winter quiets it — but does not end it, and this is a safety issue

Blacklegged ticks are not killed by cold. They go quiet below about 40°F and quest again the moment it warms — including on a New Hampshire winter thaw.

Does winter help you?

For Ticks, the winter switch is PARTIAL — winter quiets it.

Most people assume

That cold and snow kill ticks outright, so winter is a genuinely tick-free season — no need for tick checks, repellent, or concern about Lyme disease until spring.

What actually happens

Blacklegged (deer) ticks are not killed by freezing temperatures. University of New Hampshire Cooperative Extension states plainly that adult blacklegged tick "activity continues in mild winter weather (temperatures above 40°F) when there is no snow cover." Adult females are specifically documented questing — actively seeking a host — in late fall and on winter thaw days, not just in spring and summer. The tick goes quiet in the cold, but it is never truly out of commission for the season the way a hibernating mammal is; it is one warm afternoon away from being active again, all winter long.

Not one animal — not one answer
  • PARTIAL

    Blacklegged / deer tick (Ixodes scapularis)

    The species that matters here. Adults quest in October–November and again on any winter thaw. UNH Cooperative Extension reports that statewide, nearly 60% of adult blacklegged ticks tested were infected with Borrelia burgdorferi, the bacterium that causes Lyme disease — this is the winter safety story, and it deserves tick checks and protective clothing on every mild winter day.

  • OFF

    American dog tick (Dermacentor variabilis)

    Most active May through July in New Hampshire per UNH Extension, and does not transmit Lyme disease. A tick found in the dead of winter is very unlikely to be this species — reassuring, if you can identify it.

  • ON

    Winter tick / moose tick (Dermacentor albipictus)

    Active through fall, winter, and spring, but it is a wildlife issue — a one-host tick that infests moose and deer. UNH Extension notes it rarely bites people and does not transmit human disease. The "winter tick" you may have read about in the news is a moose problem, not a household one.

  • OFF

    Lone star tick (Amblyomma americanum)

    Rarely established in New Hampshire, and UNH Extension notes it is unclear whether it currently overwinters here at all — not a present winter concern, though its range is documented moving north.

The line

In New Hampshire, 'tick season' has no off switch — every winter thaw above 40 degrees is a tick day, and the adult females questing in January are the ones most likely to be carrying Lyme.

So — does winter help you?
Only partially, and only on the genuinely cold, snow-covered days. A hard, sustained freeze does suppress questing — but southern New Hampshire does not stay frozen all winter, and thaw days recur throughout the season.
What to do in January
Personal protection, not a treatment. On any thaw day with bare, unfrozen ground: dress for it — permethrin-treated clothing and tucking pants into socks are University of Rhode Island TickEncounter's explicit winter guidance — and do a full tick check on yourself, your kids, and your pets after time outdoors. There is no yard treatment or "kill them now" step that makes sense in the middle of a New Hampshire winter.
The literal question

Where they actually go

Leaf litter and duff

the leaf litter, forest duff, and stone walls at the edge of your yard and woodland border

How far from you
  1. Inside your house
  2. On your structure
  3. In your yard
  4. Nearby outdoors
  5. Gone

They are in your yard.

What the place actually is

Dormant adult blacklegged ticks shelter directly in leaf litter and forest duff, where ground-level temperatures stay noticeably milder and more stable than the open air above — University of Rhode Island TickEncounter and UNH Cooperative Extension both place them here through winter. Engorged females that fed in late fall drop into this same layer to overwinter. It is not a hiding place far from your house; it is precisely the brushy edge, stone wall, and leaf-covered ground most New Hampshire yards already have, often within a few steps of a deck or a dog's usual path.

Can you see them?
On any thaw day, yes. UNH Extension describes adults climbing knee-high onto the tips of brush and low vegetation specifically to quest — reach out and grab a passing host — which means a mild January or February afternoon can put a questing tick directly on a coat sleeve or a dog's leg. This is exactly the opposite of invisible, and exactly why a thaw-day walk deserves the same tick check as a July hike.
Where the myths die

How they actually survive it

The survival mechanism

Quiescence — wakes on any warm day

Quiescence — temperature-gated, not a seasonal sleep

Is it hibernation? No — torpor
Calling this "hibernation" is the single most dangerous imprecision in this hub. Hibernation implies the animal is reliably out of commission for the whole season, on its own internal schedule, regardless of a mild afternoon. A quiescent tick is nothing like that — it is fully capable of questing on a 45°F day in the middle of January, and it is exactly that gap between "hibernation" (safe to assume) and "quiescence" (not safe to assume) that gets people bitten on days they believed were tick-free.
How it works

Quiescence is a behavioral, temperature-controlled inactivity, not a programmed multi-month dormancy. The tick is genuinely chill-inactive when it's cold, but it carries no internal seasonal clock forcing it to stay that way — the instant ground and air temperatures rise above roughly 40°F, it can resume questing the same day. University of Rhode Island TickEncounter puts it bluntly: warm a chilled tick up even a little, and "they're good to go." Global Lyme Alliance frames the tipping point the same way, at roughly 40°F / 4°C.

Established from: University of Rhode Island TickEncounter (Winter Tick Activity); UNH Cooperative Extension (Biology and Management of Ticks in New Hampshire); Global Lyme Alliance

The winter myth

What everyone gets wrong

The myth

"The frost killed the ticks — there's no need to check for them, or worry about Lyme disease, until spring."

Why people believe it

It's a genuinely reasonable inference, not carelessness: most insects do vanish for winter, ticks are essentially invisible under snow and leaf litter, and the calendar strongly suggests "tick season" should have an off-switch the way flu season or allergy season does.

The correction

Blacklegged tick adults survive freezing temperatures and resume questing above roughly 40°F with no snow cover. NH Department of Health and Human Services states this plainly: "Ticks are active any time the outside temperature is above 40°F and they are not covered by snow." UNH Cooperative Extension and University of Rhode Island TickEncounter both document the same threshold and describe adult females actively questing on winter thaw days, not just in warmer months.

Why it matters
This myth costs a skipped tick check on exactly the kind of mild January afternoon that feels safe — and because adult female blacklegged ticks carry the highest Lyme infection rates of any life stage, a missed winter bite is not a minor miss. UNH Cooperative Extension reports that statewide, nearly 60% of adult blacklegged ticks tested were infected with Borrelia burgdorferi, and citing 2014 CDC data notes New Hampshire ranked seventh in the nation for Lyme disease cases per 100,000 people, having ranked as high as first in recent years. In a state with that burden, skipping a winter tick check on a warm day is not a trivial oversight.

Corrected from: NH Department of Health and Human Services (Tickborne Diseases); UNH Cooperative Extension (Biology and Management of Ticks in New Hampshire)

What you would actually see

The signs in January

What you would actually see
3
  • An adult tick actively questing — climbing knee-high onto brush or grass tips — on any thaw day above roughly 40°F, even in December or February
  • A tick found on a dog or cat after a walk on a mild winter afternoon
  • A tick found motionless on top of snow — this looks dead but is not; it is chill-immobilized and revives with warmth
What it means
Any of the above means active questing is genuinely underway that day, not a leftover from fall. The population hasn't returned from some seasonal absence — it never fully left.
Easily confused with
A slow, still tick on snow is easy to write off as dead. University of Rhode Island TickEncounter is explicit that this is a misread: the tick is chill-immobilized, not dead, and will resume normal activity once it warms — treat it as live.
What to do about it

The honest winter action

What genuinely works right now, and — at equal weight — what does not. This is where we decline the work there is no honest reason to do in January.

The honest verdict
Personal protection only
What works now

Permethrin-treated clothing, tucking pants into socks, and a full tick check after any time spent outdoors on a thaw day — University of Rhode Island TickEncounter's specific winter guidance. Keep pets on veterinarian-recommended tick prevention year-round rather than seasonally, since the risk doesn't reliably pause for winter either.

What does not work now

There is no meaningful January yard or acaricide treatment that changes winter tick risk in any practical way — the honest answer for this season is personal protection, not a property spray. Treating winter as "handled" because a treatment was applied would be exactly the false reassurance this page exists to correct.

Do not
  • Don't assume a hard freeze or snow cover means the winter is tick-free — a thaw day resets that instantly
  • Don't skip tick checks on a mild winter afternoon just because it's technically winter
  • Don't expect a property treatment to meaningfully reduce winter tick risk — protection, not treatment, is the honest answer this season
Our honest lane

Anchor will not sell a January tick treatment, because there is no version of one that meaningfully changes winter risk. What we can honestly offer is straightforward personal-protection advice and, where it's genuinely useful, property-level tick-habitat guidance — clearing leaf litter and brush at the yard edge reduces the shelter ticks use. Health questions — a bite, a rash, or symptoms after time outdoors — belong with a physician and with the deeper tick and Lyme information at /ticks-fleas-faq, not with a pest control appointment.

The health angle

Named, proportionate — and routed to a doctor

Lyme disease from blacklegged (deer) tick bites, active during New Hampshire winter thaw days above roughly 40°F — plus anaplasmosis and babesiosis, and rarely Powassan virus

Caution
Who is at risk
  • Anyone spending time outdoors near leaf litter, brush, or stone walls on a mild winter day
  • Pets that go outdoors regularly, even in winter, without year-round tick prevention
  • Households in wooded or brush-bordered New Hampshire properties, where UNH Extension reports high adult tick infection rates
Precautions
  • Wear permethrin-treated clothing and tuck pants into socks when outdoors on any thaw day
  • Do a full-body tick check on yourself, family members, and pets after any outdoor time, winter included
  • Keep pets on veterinarian-recommended tick prevention year-round rather than seasonally
  • Reduce leaf litter and brush at the yard edge where practical to limit tick habitat close to the house
When to seek care

See a physician promptly if you develop an expanding rash, fever, fatigue, headache, or joint pain in the weeks following any tick bite or outdoor exposure — including one that happened in winter. This page covers winter tick biology only; diagnosis and treatment of a suspected tick-borne illness should always go to a doctor, and the fuller health picture is covered at /ticks-fleas-faq.

Health guidance from: UNH Cooperative Extension; NH Department of Health and Human Services (Tickborne Diseases)

In depth

The full picture

01

Ticks don't die in winter. They wait for the next warm afternoon.

The single biggest misconception in this entire hub is about ticks, and it's the one with real health consequences. Blacklegged (deer) ticks are not killed by a New Hampshire winter. UNH Cooperative Extension states that adult activity "continues in mild winter weather (temperatures above 40°F) when there is no snow cover" — meaning the tick isn't gone, it's simply paused, and the pause ends the moment conditions allow.

That distinction is the entire point of this page. "Gone for winter" and "paused until the next warm day" sound similar but produce opposite behavior in a homeowner: one says skip the tick check, the other says do it anyway. In New Hampshire, the second answer is the correct one.

02

Where they actually are: closer than you'd guess

Dormant adult ticks shelter in leaf litter, forest duff, and around stone walls — University of Rhode Island TickEncounter and UNH Cooperative Extension both place them there through the cold months, because ground-level temperatures in that layer run noticeably milder than the open air above it. This isn't a remote hiding spot; it's the ordinary brushy edge, stone wall, or leaf-covered corner that borders most New Hampshire yards.

And on a thaw day, they don't stay hidden. UNH Extension describes adults climbing knee-high onto brush and grass tips specifically to quest for a host — which means a January walk along a stone wall or a dog's usual loop through the yard edge can put a questing tick directly on a sleeve or a pant leg.

03

The mechanism, and why 'hibernation' is the dangerous word here

What ticks do is called quiescence — a temperature-gated inactivity, not a programmed seasonal sleep. University of Rhode Island TickEncounter puts it plainly: warm a chilled tick even a little, and it's ready to go. There's no internal clock keeping it dormant regardless of conditions, the way true hibernation works in an animal like a bat. The tick's dormancy is entirely reactive to the thermometer.

That difference matters enormously in practice. A hibernating animal is genuinely out of commission for months. A quiescent tick can be actively questing within hours of a temperature swing — which is exactly why Manchester's routine winter thaws matter so much to this story, and why "hibernation" is simply the wrong word to use here.

04

The safety correction this hub exists to make

This is the one myth in the entire hub where softening the correction isn't an option. NH Department of Health and Human Services states directly: "Ticks are active any time the outside temperature is above 40°F and they are not covered by snow." UNH Cooperative Extension reports nearly 60% of adult blacklegged ticks tested statewide carried Borrelia burgdorferi, the bacterium behind Lyme disease, and — citing CDC data — that New Hampshire has ranked as high as first in the nation for Lyme disease cases per 100,000 people.

Adult female blacklegged ticks are specifically the life stage most likely to be questing on a winter thaw day, and they're also the life stage most likely to be infected. Skipping a tick check because it's January is not a small oversight in a state with this burden — it's the exact gap this page is meant to close. If you notice a rash, fever, fatigue, or joint pain after any outdoor exposure this winter, that's a conversation for a physician, not a wait-and-see.

Key takeaways
6 points
  • Blacklegged (deer) ticks are not killed by cold — they go quiet, not dead, and resume questing above roughly 40°F.
  • Manchester's winter routinely crosses that threshold: December highs commonly reach the upper 30s–low 40s, and late February averages near 39°F.
  • This is quiescence, not hibernation and not diapause — there is no internal seasonal clock keeping the tick dormant regardless of temperature.
  • Adult females quest on winter thaw days and carry the highest Lyme infection rates of any tick life stage — nearly 60% statewide per UNH Extension.
  • The honest winter action is personal protection — treated clothing and tick checks on any thaw day — not a property treatment.
  • Route any bite, rash, or symptoms to a physician and to /ticks-fleas-faq for the full health picture; this page covers the winter biology, not diagnosis or treatment.
New Hampshire context

Why New Hampshire's winter specifically keeps this risk alive

Manchester's winter climate sits right at the edge of the tick-activity threshold for much of the season. NOAA NCEI 1991–2020 climate normals put Manchester's December average high in the upper 30s to around 40°F, dropping to roughly 31°F in January before climbing back to around 35°F in February — and daily averages compiled from Manchester and Concord station data show late-February daily highs approaching 39°F. That means an ordinary winter day in southern New Hampshire is frequently at or above the roughly 40°F questing threshold UNH Cooperative Extension and University of Rhode Island TickEncounter both cite, and a genuine warm spell pushes well past it.

This is the opposite of the pattern that makes wasps and mosquitoes genuinely safe topics for a winter shrug. New Hampshire's frost, unlike a hard, unbroken northern freeze, comes with real thaw days scattered through December, January, and February — and each one is a tick day, not a tick-free one.

If you're reading this after a walk on a mild winter afternoon, the honest plan is the same one used every other season: check yourself, your kids, and your pets, and don't wait for a bite to look. If a rash or flu-like symptoms follow, that's a call to a physician, not a pest control appointment.

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The other half of this question

Want the full 12-month picture for ticks?

This page answers where they go in winter, and whether winter helps you at all. The timing guide answers the other question — when they are active, month by month, across the whole New Hampshire year.

See the 12-month timing guide

There's no January tick spray that changes this. Protection is the real answer this season.

On any thaw day, dress for it and check for ticks the same way you would in summer. For the health side of tick bites and Lyme disease, see /ticks-fleas-faq or talk to a doctor.

Get a Free Inspection(603) 785-0118
Follow-up questions

Frequently asked

Sources & citations(6)
  1. UNH Cooperative Extension — Biology and Management of Ticks in New Hampshire

    Adult blacklegged tick activity above 40°F with no snow cover, NH tick species, nearly 60% adult infection rate, NH Lyme disease ranking

    extensionverified 2026-07-16
  2. University of Rhode Island TickEncounter — Winter Tick Activity

    Ticks not killed by freezing, active when ground thawed and above ~40°F, chill-immobilization vs death, winter personal-protection guidance

    academicverified 2026-07-16
  3. NH Department of Health and Human Services — Tickborne Diseases

    "Ticks are active any time the outside temperature is above 40°F and they are not covered by snow"; NH tickborne illness overview

    govverified 2026-07-16
  4. Global Lyme Alliance — Ticks Don't Die When It's Cold Outside

    ~40°F / 4°C questing tipping point, behavioral basis of winter tick activity

    academicverified 2026-07-16
  5. NOAA NCEI — U.S. Climate Normals 1991–2020 (Manchester/Concord, NH)

    Manchester/Concord winter monthly average high temperatures (Dec upper 30s–low 40s°F, Jan ~31°F, Feb ~35°F, late-Feb daily highs near 39°F)

    govverified 2026-07-16
  6. NWS Gray/Portland ME — Concord, NH Seasonal Climate Normals (1991–2020)

    Concord NH winter (DJF) seasonal average high temperature of 34.5°F

    govverified 2026-07-16

Written & reviewed by

Verified

Daniel Brady

NH-Licensed Pesticide Applicator · License #782664 (NHDAMF, RSA 430)

Daniel Brady is the New Hampshire–licensed applicator behind Anchor Pest Services, a family-owned pest control company serving the Manchester area since 2017.

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Last updated Jul 2026

Honest pest help for New Hampshire homes

Winter Doesn't End Tick Season In New Hampshire

We'd rather tell you that plainly than sell a winter treatment that can't change thaw-day risk. What Anchor Pest Services genuinely offers on ticks is property-level habitat reduction — clearing leaf litter and brush at the yard edge — plus honest personal-protection guidance. Health questions belong with a physician and with /ticks-fleas-faq. Family-owned since 2017, NH license #782664, serving Manchester, Nashua, Concord and nearby towns.

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