Mosquito season in Beltrami County, MN: when it starts and ends
Mosquito months in Beltrami County
In a normal year mosquito season in Beltrami County, MN starts around May 9 and ends around September 30, about 21 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Beltrami County, and when
- Start tipping out standing water weekly by April 25.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after September 30.
- No West Nile cases since 2016, so bites in Beltrami County are a nuisance; check window screens.
Beltrami County against the rest of MN
Beltrami County has the 78th longest season of 87 MN counties, at 144 days against 176 in Winona County and 118 in Cook County. Its mean temperature is 39.3°F.
- Pine County: May 7 to October 2 (147 days, 1 WNV)
- Todd County: May 8 to October 1 (147 days, 5 WNV)
- Clearwater County: May 9 to September 29 (143 days, 0 WNV)
- Lake of the Woods County: May 9 to September 29 (143 days, 0 WNV)
West Nile in Beltrami County
From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Beltrami County (3 neuroinvasive) across 3 years. The worst was 2007 with 2; the latest was 2012.
Background: when the season starts across the US; how the dates are worked out.