Mosquito season in Hughes County, SD: when it starts and ends
Mosquito months in Hughes County
In a normal year mosquito season in Hughes County, SD starts around May 8 and ends around October 2, about 21 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Hughes County, and when
- Start tipping out standing water weekly by April 24.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 2.
- 24 West Nile cases since 2016: you should wear EPA-registered repellent at dusk July to August, and check SD spray notices.
Hughes County against the rest of SD
Hughes County has the 64th longest season of 66 SD counties, at 147 days against 179 in Yankton County and 139 in Lawrence County. Its mean temperature is 45.2°F.
- Harding County: May 5 to October 5 (152 days, 0 WNV)
- Meade County: May 6 to October 3 (150 days, 7 WNV)
- Custer County: May 11 to October 4 (146 days, 0 WNV)
- Lawrence County: May 15 to October 1 (139 days, 7 WNV)
West Nile in Hughes County
From 1999 to 2025, CDC ArboNET counted 110 human West Nile cases in Hughes County (20 neuroinvasive) across 21 years. The worst was 2003 with 43; the latest was 2025.
See how the dates are worked out, and reading the West Nile counts.