FleaDates › Tick season › Iowa
Midwest · IA
When are ticks active in Iowa?
Ticks in Iowa are typically active mid-March to mid-November, heaviest May–Sep — and adult blacklegged ticks can surface on any mild winter day.
Ticks to know in Iowa
Iowa dogs meet American dog ticks most often, in fencerows, pasture margins and unmowed grass, while blacklegged (deer) ticks have been filling in across the eastern half of the state and lone star ticks appear in the southern counties. The busiest window is June through September, though ticks start questing in March once the ground thaws, and a warm October afternoon in the timber still counts.
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 Iowa
| Month | Typical activity | Average temperature |
|---|---|---|
| January | Quiet | 20.6°F |
| February | Quiet | 25.2°F |
| March | Low | 37.5°F |
| April | Moderate | 49.7°F |
| May | High | 61.1°F |
| June | Peak | 70.9°F |
| July | Peak | 74.3°F |
| August | Peak | 72.1°F |
| September | Peak | 64.5°F |
| October | Moderate | 51.4°F |
| November | Low | 37.4°F |
| December | Quiet | 25.7°F |
Estimates from NOAA U.S. Climate Normals (1991–2020), averaged across 3 weather stations near Iowa'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. Iowa flea season typically runs early April to late October — see the Iowa flea season page.
Frequently asked questions
When does tick season start in Iowa?
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 Iowa?
The species dog owners most often meet in Iowa: American dog tick, blacklegged (deer) tick, lone star tick. Iowa dogs meet American dog ticks most often, in fencerows, pasture margins and unmowed grass, while blacklegged (deer) ticks have been filling in across the eastern half of the state and lone star ticks appear in the southern counties. The busiest window is June through September, though ticks start questing in March once the ground thaws, and a warm October afternoon in the timber still counts.
Do I need tick prevention in winter in Iowa?
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 Iowa?
Fleas run on a warmer calendar — in Iowa that's early April to late October. See the Iowa flea season page for that month-by-month picture.