FleaDates › Tick season › Massachusetts
Northeast · MA
When are ticks active in Massachusetts?
Ticks in Massachusetts are typically active mid-March to late November, heaviest May–Oct — and adult blacklegged ticks can surface on any mild winter day.
Ticks to know in Massachusetts
The blacklegged tick is the headline species from the Berkshires to Cape Cod, active mid-March through late November with the steepest pressure from May into October. American dog ticks work the beach grass and meadows in summer, while lone star ticks — once mostly an island story on Nantucket and Martha's Vineyard — are turning up more along the southeastern coast. Fall hikes deserve the same tick check as July ones, because adult blacklegged ticks stay busy well past the first frosts.
Wherever the calendar sits this month, the habit that actually catches ticks is the after-walk check: ears, collar line, armpits, between the toes. Prevention plus checks beats either alone.
Month-by-month tick activity in Massachusetts
| Month | Typical activity | Average temperature |
|---|---|---|
| January | Quiet | 26.6°F |
| February | Quiet | 28.8°F |
| March | Low | 36.3°F |
| April | Moderate | 47.5°F |
| May | High | 58°F |
| June | Peak | 66.9°F |
| July | Peak | 72.6°F |
| August | Peak | 71°F |
| September | Peak | 63.5°F |
| October | High | 52.2°F |
| November | Moderate | 41.8°F |
| December | Quiet | 32.4°F |
Estimates from NOAA U.S. Climate Normals (1991–2020), averaged across 3 weather stations near Massachusetts's larger cities, using the ~40°F activity threshold reported in published tick research. Real years run early or late with the weather.
Fleas peak later. Massachusetts flea season typically runs mid-April to late October — see the Massachusetts flea season page.
Frequently asked questions
When does tick season start in Massachusetts?
Around mid-March in a typical year, once temperatures clear roughly 40°F — noticeably earlier than flea season. A February thaw can bring ticks out ahead of schedule.
What ticks live in Massachusetts?
The species dog owners most often meet in Massachusetts: blacklegged (deer) tick, American dog tick, lone star tick. The blacklegged tick is the headline species from the Berkshires to Cape Cod, active mid-March through late November with the steepest pressure from May into October. American dog ticks work the beach grass and meadows in summer, while lone star ticks — once mostly an island story on Nantucket and Martha's Vineyard — are turning up more along the southeastern coast. Fall hikes deserve the same tick check as July ones, because adult blacklegged ticks stay busy well past the first frosts.
Do I need tick prevention in winter in Massachusetts?
Yes. Ticks overwinter under leaf litter and snow rather than dying off, and mild spells wake them — which is why veterinary organizations recommend year-round parasite prevention. The calendar shows when pressure peaks, not when protection can lapse.
What about fleas in Massachusetts?
Fleas run on a warmer calendar — in Massachusetts that's mid-April to late October. See the Massachusetts flea season page for that month-by-month picture.