Mosquito season in Outagamie County, WI: when it starts and ends
Mosquito months in Outagamie County
In a normal year mosquito season in Outagamie County, WI starts around April 29 and ends around October 11, about 23 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Outagamie County, and when
- Start tipping out standing water weekly by April 15.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 11.
- 5 West Nile cases since 2016 (last 2024): you should use repellent at dusk July to July, more so if over 60.
Outagamie County against the rest of WI
Outagamie County has the 28th longest season of 72 WI counties, at 164 days against 180 in La Crosse County and 139 in Rusk County. Its mean temperature is 45.2°F.
- Washington County: May 1 to October 12 (165 days, 2 WNV)
- Adams County: April 29 to October 10 (164 days, 1 WNV)
- Brown County: April 30 to October 12 (164 days, 7 WNV)
- Eau Claire County: April 28 to October 8 (163 days, 3 WNV)
West Nile in Outagamie County
From 1999 to 2025, CDC ArboNET counted 10 human West Nile cases in Outagamie County (9 neuroinvasive) across 9 years. The worst was 2024 with 2; the latest was 2024.
More: how the dates are worked out · reading the West Nile counts.