Mosquito season in Benton County, MN: when it starts and ends
Mosquito months in Benton County
In a normal year mosquito season in Benton County, MN starts around May 3 and ends around October 5, about 22 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Benton County, and when
- Start tipping out standing water weekly by April 19.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 5.
- 4 West Nile cases since 2016 (last 2025): you should use repellent at dusk July, more so if over 60.
Benton County against the rest of MN
Benton County has the 57th longest season of 87 MN counties, at 155 days against 176 in Winona County and 118 in Cook County. Its mean temperature is 42.1°F.
- Dodge County: May 2 to October 5 (156 days, 1 WNV)
- Meeker County: May 2 to October 5 (156 days, 2 WNV)
- Crow Wing County: May 3 to October 4 (154 days, 2 WNV)
- Fillmore County: May 4 to October 5 (154 days, 2 WNV)
West Nile in Benton County
From 1999 to 2025, CDC ArboNET counted 6 human West Nile cases in Benton County (5 neuroinvasive) across 2 years. The worst was 2025 with 4; the latest was 2025.
More: how the dates are worked out · reading the West Nile counts.