Mosquito season in Posey County, IN: when it starts and ends
Mosquito months in Posey County
In a normal year mosquito season in Posey County, IN starts around March 30 and ends around November 5, about 31 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Posey County, and when
- Start tipping out standing water weekly by March 16.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 5.
- No West Nile cases since 2016, so bites in Posey County are a nuisance; check window screens.
Posey County against the rest of IN
Posey County has the 5th longest season of 92 IN counties, at 220 days against 231 in Floyd County and 177 in Steuben County. Its mean temperature is 56.2°F.
- Spencer County: March 26 to November 6 (225 days, 0 WNV)
- Clark County: March 26 to November 6 (224 days, 4 WNV)
- Daviess County: March 30 to November 4 (219 days, 0 WNV)
- Warrick County: March 30 to November 3 (218 days, 1 WNV)
West Nile in Posey County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Posey County (2 neuroinvasive) across 2 years. The worst was 2012 with 1; the latest was 2012.
See how the dates are worked out, and when the season starts across the US.