Mosquito season in Aitkin County, MN: when it starts and ends
Mosquito months in Aitkin County
In a normal year mosquito season in Aitkin County, MN starts around May 7 and ends around October 2, about 21 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Aitkin County, and when
- Start tipping out standing water weekly by April 23.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 2.
- 1 West Nile case since 2016 (last 2025): you should use repellent at dusk July, more so if over 60.
Aitkin County against the rest of MN
Aitkin County has the 73rd longest season of 87 MN counties, at 148 days against 176 in Winona County and 118 in Cook County. Its mean temperature is 40.6°F.
- Red Lake County: May 5 to October 2 (149 days, 1 WNV)
- Hubbard County: May 6 to October 1 (148 days, 0 WNV)
- Wadena County: May 7 to October 1 (148 days, 1 WNV)
- Kittson County: May 6 to September 30 (147 days, 0 WNV)
West Nile in Aitkin County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Aitkin County (1 neuroinvasive) across 1 year. The worst was 2025 with 1; the latest was 2025.
More: how the dates are worked out · when the season starts across the US.