Short answer: yes — ticks can be active in winter. Most European ticks, such as the castor bean tick (Ixodes ricinus), do not die when the temperature drops. They become dormant and start questing again on any mild day when the ground warms above roughly 4–7 °C (about 40 °F). That means Lyme disease and tick-borne encephalitis (TBE) stay a low-but-real risk on warm winter afternoons, in sheltered woodland, and increasingly across milder European winters.
Key takeaways
- Ticks don’t hibernate on a fixed date — their activity is driven by temperature, not the calendar.
- Adult ticks are the stage most likely to quest in autumn, winter and early spring.
- Any day above about 4–7 °C can bring ticks out, especially in leaf litter, long grass and woodland edges.
- Milder European winters are lengthening the tick season and pushing tick ranges to higher altitudes and latitudes.
- Year-round habits — cover up, check yourself after being outdoors, use a repellent proven against ticks — matter more than the month on the calendar.
Do ticks die in winter?
No. Ticks are remarkably cold-hardy. Rather than dying off in autumn, they shelter in leaf litter, soil and low vegetation, where a layer of snow actually insulates them from hard frost. During a genuine cold spell they enter a dormant state (diapause) and simply wait. When a mild day arrives, they resume questing — climbing to the tip of a grass blade or a low twig, front legs outstretched, ready to grab onto a passing host.
This is why ‘tick season’ is a misleading idea. There is a busy season and a quiet season, but there is rarely a truly tick-free season across much of Europe.
What temperature do ticks become active?
As a rule of thumb, Ixodes ticks begin questing once temperatures climb above roughly 4–7 °C. That threshold is easily reached on a sunny winter afternoon in much of Central and Western Europe, and is met almost year-round in mild maritime climates such as the UK and Ireland. Prolonged deep freeze suppresses activity; a January thaw brings it straight back.
Which ticks are active in winter?
Tick life stages behave differently through the year:
- Larvae and nymphs — most active in late spring and summer. The pinhead-sized nymphs cause the majority of Lyme disease cases because they are so easy to miss.
- Adults — peak in autumn and can stay active through mild winters into early spring, questing whenever conditions allow.
So a tick you find in December or February is most likely an adult Ixodes ricinus that took advantage of a warm window. It is fewer in number than a June nymph — but it can still transmit disease.
Tick activity through the year
| Season | Activity level | Main stage | What to do |
|---|---|---|---|
| Spring | Rising quickly as it warms | Nymphs & adults | Start routine checks; treat pets |
| Summer | Peak | Nymphs | Repellent, covered clothing, daily checks |
| Autumn | High (a second peak) | Adults | Keep up protection on walks |
| Winter | Low, but real on mild days | Adults | Don’t drop your guard when it’s above ~5 °C |
Why the tick season is getting longer
Across Europe, tick seasons are stretching and tick ranges are expanding. Milder winters, shorter cold snaps and earlier springs give ticks longer windows to feed and reproduce. The European Centre for Disease Prevention and Control (ECDC) links these warming trends to ticks moving into higher altitudes and more northern latitudes than a generation ago, and to a broader geographic spread of tick-borne encephalitis (TBE).
The practical takeaway is simple: an activity you once treated as a ‘summer only’ risk — a winter hike, a dog walk through long grass, clearing the garden on a mild day — now deserves a quick tick check whatever the month.
How to protect yourself from ticks in winter
- Stick to the centre of paths and avoid brushing through long grass, bracken and leaf litter.
- Wear long sleeves and tuck trousers into socks; light-coloured clothing makes ticks easier to spot.
- Apply a repellent proven against ticks to exposed skin before you head out.
- Check yourself, children and pets when you get home — including the scalp, behind the ears, waistband, armpits, groin and backs of the knees.
- Shower within a couple of hours of coming indoors to wash off unattached ticks.
- If you find an attached tick, remove it promptly with fine-tipped tweezers or a tick tool, pulling steadily upward without twisting, then clean the area.
Prompt removal matters: the risk of Lyme transmission rises the longer a tick stays attached, so daily checks in the quiet season are just as worthwhile as in July.
How incognito® helps
A repellent is only one layer of protection, but it is a layer you can carry year-round. Our Active Tick Protection Bundle pairs a DEET-free repellent spray with complementary steps for outdoor days — garden, hiking and dog walks alike. The active ingredient is PMD (para-menthane-3,8-diol), sold as Citrepel® — the same class of plant-based active that the CDC and EPA list alongside DEET as effective against both mosquitoes and ticks. Every incognito® formula is DEET-free, clinically tested, vegan and biodegradable, so you can keep protecting your skin on mild winter days without harsh chemistry. If mosquitoes are also on your radar for travel, our insect repellent spray covers both.
FAQs
Can you get ticks in winter?
Yes. Ticks become active whenever the temperature rises above roughly 4–7 °C, so mild winter days — common in much of Europe and the UK — can bring them out, particularly adult ticks.
At what temperature do ticks stop being active?
Activity drops off sharply during sustained freezing weather, but ticks are not killed by it — they go dormant in leaf litter and soil and become active again during the next mild spell.
Can you catch Lyme disease in winter?
The risk is lower than in summer but not zero. An adult tick questing on a warm winter day can still transmit the bacteria that cause Lyme disease, so a bite still warrants a check and, if symptoms appear, medical advice.
Do ticks die when it snows?
No. Snow cover actually insulates ticks from the coldest air, helping them survive. They shelter beneath it and resume activity when it melts and temperatures climb.
Should I use tick repellent in winter?
If you are walking in woodland, long grass or with a dog on a mild day, a repellent proven against ticks is a sensible precaution alongside covering up and checking yourself afterwards.
Sources
- CDC — Preventing Tick Bites
- ECDC — Tick-borne encephalitis
- NHS — Lyme disease
- EPA — Skin-Applied Repellent Ingredients
This article is for general information only and is not medical advice. If you develop a rash, fever, or flu-like symptoms after a tick bite, seek advice from a healthcare professional. Always use repellents as directed on the product label.