FleaDates › Tick season › Minnesota
Midwest · MN
When are ticks active in Minnesota?
Ticks in Minnesota are typically active late March to early November, heaviest May–Sep — and adult blacklegged ticks can surface on any mild winter day.
Ticks to know in Minnesota
Minnesota is blacklegged (deer) tick country, and the hardwood and mixed forests of the central and eastern part of the state are where dogs meet them; the tiny nymphs are most active in late spring and early summer. American dog ticks — the big ones people here call wood ticks — show up in prairie grass and along trail edges from April onward. Tick pressure holds highest June through August and stays real through September and October.
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 Minnesota
| Month | Typical activity | Average temperature |
|---|---|---|
| January | Quiet | 14°F |
| February | Quiet | 18.2°F |
| March | Quiet | 30.7°F |
| April | Moderate | 43.9°F |
| May | High | 56.4°F |
| June | Peak | 66.1°F |
| July | Peak | 70.6°F |
| August | Peak | 68.5°F |
| September | High | 60.6°F |
| October | Moderate | 47.2°F |
| November | Quiet | 32.7°F |
| December | Quiet | 20°F |
Estimates from NOAA U.S. Climate Normals (1991–2020), averaged across 3 weather stations near Minnesota'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. Minnesota flea season typically runs late April to mid-October — see the Minnesota flea season page.
Frequently asked questions
When does tick season start in Minnesota?
Around late 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 Minnesota?
The species dog owners most often meet in Minnesota: blacklegged (deer) tick, American dog tick. Minnesota is blacklegged (deer) tick country, and the hardwood and mixed forests of the central and eastern part of the state are where dogs meet them; the tiny nymphs are most active in late spring and early summer. American dog ticks — the big ones people here call wood ticks — show up in prairie grass and along trail edges from April onward. Tick pressure holds highest June through August and stays real through September and October.
Do I need tick prevention in winter in Minnesota?
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 Minnesota?
Fleas run on a warmer calendar — in Minnesota that's late April to mid-October. See the Minnesota flea season page for that month-by-month picture.