Mosquito season in Jackson County, MN: when it starts and ends
Mosquito months in Jackson County
In a normal year mosquito season in Jackson County, MN starts around April 29 and ends around October 9, about 23 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Jackson County, and when
- Start tipping out standing water weekly by April 15.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 9.
- 3 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to July, more so if over 60.
Jackson County against the rest of MN
Jackson County has the 39th longest season of 87 MN counties, at 163 days against 176 in Winona County and 118 in Cook County. Its mean temperature is 44.1°F.
- Lac qui Parle County: April 28 to October 8 (163 days, 3 WNV)
- Traverse County: April 28 to October 9 (163 days, 7 WNV)
- Nobles County: April 29 to October 9 (163 days, 3 WNV)
- Goodhue County: April 29 to October 8 (162 days, 1 WNV)
West Nile in Jackson County
From 1999 to 2025, CDC ArboNET counted 7 human West Nile cases in Jackson County (6 neuroinvasive) across 6 years. The worst was 2018 with 2; the latest was 2025.
More: how the dates are worked out · when mosquitoes go away for the winter.