Mosquito season in Carroll County, IN: when it starts and ends
Mosquito months in Carroll County
In a normal year mosquito season in Carroll County, IN starts around April 11 and ends around October 26, about 28 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Carroll County, and when
- Start tipping out standing water weekly by March 28.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 26.
- No West Nile cases since 2016, so bites in Carroll County are a nuisance; check window screens.
Carroll County against the rest of IN
Carroll County has the 42nd longest season of 92 IN counties, at 198 days against 231 in Floyd County and 177 in Steuben County. Its mean temperature is 51.6°F.
- Boone County: April 10 to October 26 (199 days, 1 WNV)
- Union County: April 10 to October 26 (199 days, 0 WNV)
- Clinton County: April 11 to October 26 (198 days, 1 WNV)
- Hancock County: April 11 to October 25 (198 days, 2 WNV)
West Nile in Carroll County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Carroll County (0 neuroinvasive) across 1 year. The worst was 2005 with 1; the latest was 2005.
Background: when mosquitoes go away for the winter; how the dates are worked out.