Mosquito season in Stevens County, MN: when it starts and ends
Mosquito months in Stevens County
In a normal year mosquito season in Stevens County, MN starts around May 1 and ends around October 6, about 23 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Stevens County, and when
- Start tipping out standing water weekly by April 17.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 6.
- 3 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to July, more so if over 60.
Stevens County against the rest of MN
Stevens County has the 48th longest season of 87 MN counties, at 159 days against 176 in Winona County and 118 in Cook County. Its mean temperature is 42.6°F.
- Murray County: May 1 to October 8 (160 days, 8 WNV)
- Grant County: May 1 to October 7 (159 days, 2 WNV)
- Pope County: May 1 to October 6 (158 days, 0 WNV)
- Stearns County: May 1 to October 7 (158 days, 12 WNV)
West Nile in Stevens County
From 1999 to 2025, CDC ArboNET counted 22 human West Nile cases in Stevens County (7 neuroinvasive) across 13 years. The worst was 2013 with 4; the latest was 2025.
Background: when the season starts across the US; how the dates are worked out.