Mosquito season in McLeod County, MN: when it starts and ends
Mosquito months in McLeod County
In a normal year mosquito season in McLeod County, MN starts around April 27 and ends around October 10, about 24 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in McLeod 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 10.
- 4 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to July, more so if over 60.
McLeod County against the rest of MN
McLeod County has the 24th longest season of 87 MN counties, at 165 days against 176 in Winona County and 118 in Cook County. Its mean temperature is 44.3°F.
- Chippewa County: April 27 to October 10 (165 days, 3 WNV)
- Isanti County: April 27 to October 9 (165 days, 1 WNV)
- Scott County: April 28 to October 10 (165 days, 13 WNV)
- Wabasha County: April 28 to October 10 (165 days, 1 WNV)
West Nile in McLeod County
From 1999 to 2025, CDC ArboNET counted 17 human West Nile cases in McLeod County (6 neuroinvasive) across 8 years. The worst was 2004 with 4; the latest was 2025.
More: how the dates are worked out · reading the West Nile counts.