Mosquito season in Sawyer County, WI: when it starts and ends
Mosquito months in Sawyer County
In a normal year mosquito season in Sawyer County, WI 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 Sawyer 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.
- 2 West Nile cases since 2016 (last 2021): you should use repellent at dusk July, more so if over 60.
Sawyer County against the rest of WI
Sawyer County has the 61st longest season of 72 WI counties, at 148 days against 180 in La Crosse County and 139 in Rusk County. Its mean temperature is 41.1°F.
- Douglas County: May 7 to October 4 (151 days, 3 WNV)
- Lincoln County: May 7 to October 2 (148 days, 1 WNV)
- Langlade County: May 8 to October 2 (148 days, 0 WNV)
- Price County: May 9 to October 1 (145 days, 1 WNV)
West Nile in Sawyer County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Sawyer County (2 neuroinvasive) across 2 years. The worst was 2021 with 1; the latest was 2021.
See how the dates are worked out, and when the season starts across the US.