Mosquito season in Kandiyohi County, MN: when it starts and ends
Mosquito months in Kandiyohi County
In a normal year mosquito season in Kandiyohi County, MN starts around April 30 and ends around October 8, about 23 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Kandiyohi County, and when
- Start tipping out standing water weekly by April 16.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 8.
- 9 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to July, more so if over 60.
Kandiyohi County against the rest of MN
Kandiyohi County has the 45th longest season of 87 MN counties, at 160 days against 176 in Winona County and 118 in Cook County. Its mean temperature is 43.2°F.
- Mower County: April 30 to October 8 (161 days, 0 WNV)
- Renville County: April 30 to October 7 (161 days, 5 WNV)
- Murray County: May 1 to October 8 (160 days, 8 WNV)
- Grant County: May 1 to October 7 (159 days, 2 WNV)
West Nile in Kandiyohi County
From 1999 to 2025, CDC ArboNET counted 24 human West Nile cases in Kandiyohi County (12 neuroinvasive) across 12 years. The worst was 2003 with 9; the latest was 2025.
See how the dates are worked out, and reading the West Nile counts.