Mosquito season in Stearns County, MN: when it starts and ends
Mosquito months in Stearns County
In a normal year mosquito season in Stearns County, MN starts around May 1 and ends around October 7, about 23 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Stearns 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 7.
- 12 West Nile cases since 2016: you should wear EPA-registered repellent at dusk July to July, and check MN spray notices.
Stearns County against the rest of MN
Stearns County has the 50th longest season of 87 MN counties, at 158 days against 176 in Winona County and 118 in Cook County. Its mean temperature is 42.8°F.
- Stevens County: May 1 to October 6 (159 days, 3 WNV)
- Pope County: May 1 to October 6 (158 days, 0 WNV)
- Wilkin County: May 1 to October 6 (158 days, 6 WNV)
- Lincoln County: May 2 to October 7 (158 days, 2 WNV)
West Nile in Stearns County
From 1999 to 2025, CDC ArboNET counted 33 human West Nile cases in Stearns County (23 neuroinvasive) across 12 years. The worst was 2003 with 8; the latest was 2025.
More: how the dates are worked out · reading the West Nile counts.