Mosquito season in Redwood County, MN: when it starts and ends
Mosquito months in Redwood County
In a normal year mosquito season in Redwood 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 Redwood 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.
- 9 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to July, more so if over 60.
Redwood County against the rest of MN
Redwood County has the 21st longest season of 87 MN counties, at 166 days against 176 in Winona County and 118 in Cook County. Its mean temperature is 44.8°F.
- Steele County: April 28 to October 11 (167 days, 3 WNV)
- Lyon County: April 27 to October 11 (166 days, 18 WNV)
- Chippewa County: April 27 to October 10 (165 days, 3 WNV)
- Isanti County: April 27 to October 9 (165 days, 1 WNV)
West Nile in Redwood County
From 1999 to 2025, CDC ArboNET counted 23 human West Nile cases in Redwood County (8 neuroinvasive) across 16 years. The worst was 2013 with 3; the latest was 2025.
Background: reading the West Nile counts; how the dates are worked out.