Mosquito season in Wood County, WI: when it starts and ends
Mosquito months in Wood County
In a normal year mosquito season in Wood County, WI starts around April 30 and ends around October 8, about 23 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Wood County, and when
- Start tipping out standing water weekly by April 16.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 8.
- 5 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to July, more so if over 60.
Wood County against the rest of WI
Wood County has the 39th longest season of 72 WI counties, at 161 days against 180 in La Crosse County and 139 in Rusk County. Its mean temperature is 44.1°F.
- Waupaca County: April 30 to October 9 (162 days, 0 WNV)
- Trempealeau County: April 30 to October 8 (161 days, 7 WNV)
- Jackson County: April 30 to October 7 (160 days, 0 WNV)
- Vernon County: April 30 to October 8 (160 days, 0 WNV)
West Nile in Wood County
From 1999 to 2025, CDC ArboNET counted 7 human West Nile cases in Wood County (7 neuroinvasive) across 4 years. The worst was 2025 with 2; the latest was 2025.
More: how the dates are worked out · reading the West Nile counts.