Mosquito season in Manitowoc County, WI: when it starts and ends
Mosquito months in Manitowoc County
In a normal year mosquito season in Manitowoc County, WI starts around May 11 and ends around October 11, about 22 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Manitowoc County, and when
- Start tipping out standing water weekly by April 27.
- Book any yard treatment for mid May, ahead of the August peak.
- Repellent can go away after October 11.
- 3 West Nile cases since 2016 (last 2024): you should use repellent at dusk August, more so if over 60.
Manitowoc County against the rest of WI
Manitowoc County has the 56th longest season of 72 WI counties, at 153 days against 180 in La Crosse County and 139 in Rusk County. Its mean temperature is 44.3°F.
- Menominee County: May 4 to October 5 (154 days, 0 WNV)
- Kewaunee County: May 9 to October 10 (154 days, 2 WNV)
- Taylor County: May 4 to October 3 (152 days, 0 WNV)
- Juneau County: May 5 to October 3 (151 days, 3 WNV)
West Nile in Manitowoc County
From 1999 to 2025, CDC ArboNET counted 6 human West Nile cases in Manitowoc County (4 neuroinvasive) across 6 years. The worst was 2024 with 1; the latest was 2024.
Background: when the season starts across the US; how the dates are worked out.