Mosquito season in Aurora County, SD: when it starts and ends
Mosquito months in Aurora County
In a normal year mosquito season in Aurora County, SD starts around April 27 and ends around October 11, about 24 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Aurora County, and when
- Start tipping out standing water weekly by April 13.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 11.
- 5 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to August, more so if over 60.
Aurora County against the rest of SD
Aurora County has the 16th longest season of 66 SD counties, at 167 days against 179 in Yankton County and 139 in Lawrence County. Its mean temperature is 46.1°F.
- Gregory County: April 26 to October 13 (170 days, 3 WNV)
- Jones County: April 27 to October 13 (168 days, 0 WNV)
- Miner County: April 27 to October 11 (167 days, 5 WNV)
- Lake County: April 27 to October 10 (166 days, 11 WNV)
West Nile in Aurora County
From 1999 to 2025, CDC ArboNET counted 15 human West Nile cases in Aurora County (5 neuroinvasive) across 8 years. The worst was 2012 with 5; the latest was 2025.
Background: reading the West Nile counts; how the dates are worked out.