Autumn tick season: why the risk doesn't end with summer

No, tick season does not end with summer. In the US and the UK, ticks are most active from March to November, and in England and the US Northeast, September and October are among the riskiest months of the year. Adult ticks keep feeding on any mild day above about 4 °C (39 °F). So keep your dog’s tick protection going through autumn, keep checking after walks, and ask your vet before you stop it.

Use the calendar above to see the tick months for your country.

Why autumn is tick weather

Somewhere around the first cool week of September, many dog owners decide that tick season is over. Nobody has told the ticks. Ticks dislike hot, dry summers more than they dislike cool weather. What they thrive in is exactly what autumn provides: mild temperatures, damp vegetation and deep leaf litter to shelter in.

In the US, adult blacklegged ticks, the species that transmits Lyme disease, become active in the autumn as summer heat fades, and they stay active on mild days deep into the year. In the UK, tick activity usually shows two peaks, spring and autumn, and mild, wet autumns stretch the season further. In both countries the practical rule is the same: ticks are active whenever it is mild and damp, which describes most autumn days.

Autumn habits also raise exposure: leaf-pile walks, woodland routes, longer grass left unmown, and dogs snuffling through exactly the damp margins where ticks wait for a host.

Autumn tick risk by month

The table shows the tick risk in three regions, from the regional risk calendars in Maggie, which a vet reviewed.

Two things stand out. First, in England and the US Northeast, autumn is not the tail of the season. It is a second peak, as high as spring. Second, the US West Coast runs the other way. There, the western blacklegged tick is most active in the wet winter and spring, so November to April needs the most care.

Winter lowers the risk in most places but does not remove it. A dog walked through woodland on a mild December afternoon can still pick up a tick.

What this means practically

• Do not stop prevention in September. If you use a monthly or 12-week product, keep the rhythm through autumn at least, and talk to your vet about whether year-round makes sense where you live. The Companion Animal Parasite Council recommends that pets stay on tick control all year. Our guide to flea and tick schedules covers the intervals and has a calculator for the next dose.
• Give each dose on time. A monthly product given two weeks late leaves two weeks with no cover, in the middle of a peak.
• Keep checking after walks. An autumn coat and darker evenings make ticks easier to miss, so a deliberate check beats a casual glance.
• Know your local season. A dog in the mild, damp southwest of England has a longer tick year than one in a region with early hard frosts. Regional reality beats national averages. The flea and tick months by country post covers the other countries.

How to check your dog after an autumn walk

Make the check part of drying your dog at the door. Use your fingertips, not only your eyes, because a tick in a thick autumn coat is easier to feel than to see.

1. Head and neck. Feel around the lips, inside and behind the ears, and under the collar.
2. Front legs. Check the armpits and between the toes of each paw. Wet leaves stick between toes, and so do ticks.
3. Body and back legs. Run your fingers along the belly, the groin, the inside of the back legs and the base of the tail.

A tick feels like a small, hard bump. A young tick can be the size of a poppy seed, so go slowly where the coat is thickest.

How to remove a tick

The NHS advice on removing ticks is written for people, and the same method works on a dog:

1. Use a tick hook or fine-tipped tweezers.
2. Grip the tick as close to the skin as you can.
3. Pull slowly upwards, without squeezing or crushing the tick.
4. Clean the bite with antiseptic or soap and water.

Then write down when and where you found it. If symptoms appear weeks later, that date is exactly what your vet will ask for. If part of the tick stays in the skin, or you are not sure, ask your vet.

When to call the vet

Tick-borne disease can turn serious within days. If a tick bite is followed by lethargy, fever, lameness or loss of appetite in the weeks after, see your vet and mention the bite and its date. In the US Northeast, read Lyme season in the Northeast for the signs of Lyme disease.

Where Maggie fits

Maggie’s regional risk profile tracks seasonal hazards for your climate zone, so tick pressure in your area in October is represented honestly rather than assumed away by a summer-only mental model. The risk card sits next to your dog’s live coverage, computed from actual dose history: if the last flea and tick dose has quietly expired mid-autumn, that is visible at a glance rather than discovered at the vet. A tick found and removed can be logged to the timeline in seconds, date attached, and a lapsed schedule is one tap from a new reminder.

Autumn walks are the best of the year. Take them, check the dog, and keep the schedule running.

Leo is an AI companion, not a veterinarian. For medical concerns, always consult your vet.