Mosquito season in Bennett County, SD: when it starts and ends
Mosquito months in Bennett County
In a normal year mosquito season in Bennett County, SD starts around May 2 and ends around October 10, about 23 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Bennett County, and when
- Start tipping out standing water weekly by April 18.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 10.
- 1 West Nile case since 2016 (last 2016): you should use repellent at dusk July to August, more so if over 60.
Bennett County against the rest of SD
Bennett County has the 34th longest season of 66 SD counties, at 161 days against 179 in Yankton County and 139 in Lawrence County. Its mean temperature is 47.2°F.
- Kingsbury County: April 29 to October 8 (161 days, 17 WNV)
- Perkins County: May 1 to October 9 (161 days, 1 WNV)
- Hyde County: May 2 to October 10 (161 days, 1 WNV)
- Corson County: April 30 to October 7 (160 days, 3 WNV)
West Nile in Bennett County
From 1999 to 2025, CDC ArboNET counted 16 human West Nile cases in Bennett County (3 neuroinvasive) across 7 years. The worst was 2003 with 7; the latest was 2016.
Background: when the season starts across the US; how the dates are worked out.