FleaDates › Tick season › South Dakota
Midwest · SD
When are ticks active in South Dakota?
Ticks in South Dakota 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 South Dakota
American dog ticks are the ticks most South Dakota dogs bring home, and Rocky Mountain wood ticks are part of the picture in the Black Hills and western ranges; blacklegged (deer) ticks are limited to the far eastern edge of the state. The season opens in March, runs strongest May through September, and tapers through October into November.
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 South Dakota
| Month | Typical activity | Average temperature |
|---|---|---|
| January | Quiet | 18.3°F |
| February | Quiet | 22°F |
| March | Low | 33.5°F |
| April | Moderate | 45.2°F |
| May | High | 56.8°F |
| June | Peak | 67.4°F |
| July | Peak | 73°F |
| August | Peak | 70.8°F |
| September | Peak | 62°F |
| October | Moderate | 47.7°F |
| November | Low | 33.4°F |
| December | Quiet | 22.1°F |
Estimates from NOAA U.S. Climate Normals (1991–2020), averaged across 3 weather stations near South Dakota'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. South Dakota flea season typically runs late April to mid-October — see the South Dakota flea season page.
Frequently asked questions
When does tick season start in South Dakota?
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 South Dakota?
The species dog owners most often meet in South Dakota: American dog tick, Rocky Mountain wood tick, blacklegged (deer) tick. American dog ticks are the ticks most South Dakota dogs bring home, and Rocky Mountain wood ticks are part of the picture in the Black Hills and western ranges; blacklegged (deer) ticks are limited to the far eastern edge of the state. The season opens in March, runs strongest May through September, and tapers through October into November.
Do I need tick prevention in winter in South Dakota?
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 South Dakota?
Fleas run on a warmer calendar — in South Dakota that's late April to mid-October. See the South Dakota flea season page for that month-by-month picture.