Mosquito season in Shawano County, WI: when it starts and ends
Mosquito months in Shawano County
In a normal year mosquito season in Shawano County, WI starts around May 2 and ends around October 7, about 22 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Shawano 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 7.
- 4 West Nile cases since 2016 (last 2017): you should use repellent at dusk July, more so if over 60.
Shawano County against the rest of WI
Shawano County has the 48th longest season of 72 WI counties, at 157 days against 180 in La Crosse County and 139 in Rusk County. Its mean temperature is 43.5°F.
- Barron County: May 2 to October 6 (157 days, 2 WNV)
- Marathon County: May 2 to October 6 (157 days, 3 WNV)
- Clark County: May 2 to October 5 (156 days, 1 WNV)
- Washburn County: May 2 to October 6 (156 days, 0 WNV)
West Nile in Shawano County
From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in Shawano County (4 neuroinvasive) across 2 years. The worst was 2017 with 4; the latest was 2017.
More: how the dates are worked out · reading the West Nile counts.