Mosquito season in Fillmore County, MN: when it starts and ends
Mosquito months in Fillmore County
In a normal year mosquito season in Fillmore County, MN starts around May 4 and ends around October 5, about 22 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Fillmore County, and when
- Start tipping out standing water weekly by April 20.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 5.
- 2 West Nile cases since 2016 (last 2023): you should use repellent at dusk July, more so if over 60.
Fillmore County against the rest of MN
Fillmore County has the 59th longest season of 87 MN counties, at 154 days against 176 in Winona County and 118 in Cook County. Its mean temperature is 43.8°F.
- Benton County: May 3 to October 5 (155 days, 4 WNV)
- Crow Wing County: May 3 to October 4 (154 days, 2 WNV)
- Cass County: May 3 to October 4 (153 days, 4 WNV)
- Kanabec County: May 4 to October 4 (153 days, 0 WNV)
West Nile in Fillmore County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Fillmore County (2 neuroinvasive) across 2 years. The worst was 2023 with 1; the latest was 2023.
More: how the dates are worked out · when the season starts across the US.