Mosquito season in Renville County, MN: when it starts and ends
Mosquito months in Renville County
In a normal year mosquito season in Renville County, MN starts around April 30 and ends around October 7, about 23 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Renville 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 7.
- 5 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to July, more so if over 60.
Renville County against the rest of MN
Renville County has the 44th longest season of 87 MN counties, at 161 days against 176 in Winona County and 118 in Cook County. Its mean temperature is 43.2°F.
- Sherburne County: April 29 to October 8 (162 days, 5 WNV)
- Mower County: April 30 to October 8 (161 days, 0 WNV)
- Kandiyohi County: April 30 to October 8 (160 days, 9 WNV)
- Murray County: May 1 to October 8 (160 days, 8 WNV)
West Nile in Renville County
From 1999 to 2025, CDC ArboNET counted 12 human West Nile cases in Renville County (2 neuroinvasive) across 5 years. The worst was 2003 with 5; the latest was 2025.
More: how the dates are worked out · reading the West Nile counts.