Mosquito season in Washburn County, WI: when it starts and ends
Mosquito months in Washburn County
In a normal year mosquito season in Washburn County, WI starts around May 2 and ends around October 6, about 22 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Washburn County, and when
- Start tipping out standing water weekly by April 18.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 6.
- No West Nile cases since 2016, so bites in Washburn County are a nuisance; check window screens.
Washburn County against the rest of WI
Washburn County has the 50th longest season of 72 WI counties, at 156 days against 180 in La Crosse County and 139 in Rusk County. Its mean temperature is 42.5°F.
- Shawano County: May 2 to October 7 (157 days, 4 WNV)
- Clark County: May 2 to October 5 (156 days, 1 WNV)
- Pierce County: May 3 to October 5 (155 days, 1 WNV)
- Oconto County: May 4 to October 6 (155 days, 2 WNV)
West Nile in Washburn County
CDC ArboNET lists no human West Nile cases for Washburn County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 9 of those years.
More: how the dates are worked out · when mosquitoes go away for the winter.