Mosquito season in Lake of the Woods County, MN: when it starts and ends

Mosquito months in Lake of the Woods County

In a normal year mosquito season in Lake of the Woods County, MN starts around May 9 and ends around September 29, about 20 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in Lake of the Woods 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 29.
• No West Nile cases since 2016, so bites in Lake of the Woods County are a nuisance; check window screens.

Lake of the Woods County against the rest of MN

Lake of the Woods County has the 80th longest season of 87 MN counties, at 143 days against 176 in Winona County and 118 in Cook County. Its mean temperature is 38.7°F.

• Beltrami County: May 9 to September 30 (144 days, 0 WNV)
• Clearwater County: May 9 to September 29 (143 days, 0 WNV)
• Itasca County: May 10 to September 29 (142 days, 5 WNV)
• Roseau County: May 10 to September 28 (141 days, 2 WNV)

West Nile in Lake of the Woods County

CDC ArboNET lists no human West Nile cases for Lake of the Woods County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 1 of those years.

More: how the dates are worked out · when the season starts across the US.