Mosquito season in Marinette County, WI: when it starts and ends
Mosquito months in Marinette County
In a normal year mosquito season in Marinette County, WI starts around May 14 and ends around October 3, about 20 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Marinette County, and when
- Start tipping out standing water weekly by April 30.
- Book any yard treatment for mid May, ahead of the July peak.
- Repellent can go away after October 3.
- 1 West Nile case since 2016 (last 2023): you should use repellent at dusk July, more so if over 60.
Marinette County against the rest of WI
Marinette County has the 67th longest season of 72 WI counties, at 142 days against 180 in La Crosse County and 139 in Rusk County. Its mean temperature is 42.3°F.
- Ashland County: May 13 to October 3 (144 days, 0 WNV)
- Iron County: May 11 to September 30 (143 days, 0 WNV)
- Forest County: May 10 to September 29 (141 days, 0 WNV)
- Florence County: May 11 to September 29 (141 days, 0 WNV)
West Nile in Marinette County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Marinette County (2 neuroinvasive) across 2 years. The worst was 2023 with 1; the latest was 2023.
More: how the dates are worked out · when the season starts across the US.