Mosquito season in Vilas County, WI: when it starts and ends
Mosquito months in Vilas County
In a normal year mosquito season in Vilas County, WI starts around May 12 and ends around September 29, about 20 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Vilas County, and when
- Start tipping out standing water weekly by April 28.
- Book any yard treatment for mid May, ahead of the July peak.
- Repellent can go away after September 29.
- 1 West Nile case since 2016 (last 2017): you should use repellent at dusk July, more so if over 60.
Vilas County against the rest of WI
Vilas County has the 71st longest season of 72 WI counties, at 140 days against 180 in La Crosse County and 139 in Rusk County. Its mean temperature is 39.6°F.
- Florence County: May 11 to September 29 (141 days, 0 WNV)
- Oneida County: May 13 to October 1 (141 days, 0 WNV)
- Rusk County: May 15 to October 1 (139 days, 1 WNV)
West Nile in Vilas County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Vilas County (1 neuroinvasive) across 1 year. The worst was 2017 with 1; the latest was 2017.
Background: when the season starts across the US; how the dates are worked out.