Mosquito season in Anoka County, MN: when it starts and ends
Mosquito months in Anoka County
In a normal year mosquito season in Anoka County, MN starts around April 28 and ends around October 9, about 23 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Anoka County, and when
- Start tipping out standing water weekly by April 14.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 9.
- 23 West Nile cases since 2016: you should wear EPA-registered repellent at dusk July to July, and check MN spray notices.
Anoka County against the rest of MN
Anoka County has the 28th longest season of 87 MN counties, at 164 days against 176 in Winona County and 118 in Cook County. Its mean temperature is 44°F.
- Wabasha County: April 28 to October 10 (165 days, 1 WNV)
- Yellow Medicine County: April 28 to October 10 (165 days, 6 WNV)
- Big Stone County: April 28 to October 9 (164 days, 5 WNV)
- Le Sueur County: April 28 to October 9 (164 days, 4 WNV)
West Nile in Anoka County
From 1999 to 2025, CDC ArboNET counted 34 human West Nile cases in Anoka County (24 neuroinvasive) across 15 years. The worst was 2025 with 5; the latest was 2025.
More: how the dates are worked out · reading the West Nile counts.