Mosquito season in Door County, WI: when it starts and ends
Mosquito months in Door County
In a normal year mosquito season in Door County, WI starts around May 9 and ends around October 11, about 22 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Door County, and when
- Start tipping out standing water weekly by April 25.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 11.
- No West Nile cases since 2016, so bites in Door County are a nuisance; check window screens.
Door County against the rest of WI
Door County has the 53rd longest season of 72 WI counties, at 155 days against 180 in La Crosse County and 139 in Rusk County. Its mean temperature is 44.3°F.
- Pierce County: May 3 to October 5 (155 days, 1 WNV)
- Oconto County: May 4 to October 6 (155 days, 2 WNV)
- Menominee County: May 4 to October 5 (154 days, 0 WNV)
- Kewaunee County: May 9 to October 10 (154 days, 2 WNV)
West Nile in Door County
CDC ArboNET lists no human West Nile cases for Door County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 5 of those years.
More: how the dates are worked out · when mosquitoes go away for the winter.