Mosquito season in Hancock County, IN: when it starts and ends
Mosquito months in Hancock County
In a normal year mosquito season in Hancock County, IN starts around April 11 and ends around October 25, about 28 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Hancock 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 25.
- 2 West Nile cases since 2016 (last 2025): you should use repellent at dusk June to August, more so if over 60.
Hancock County against the rest of IN
Hancock County has the 44th longest season of 92 IN counties, at 198 days against 231 in Floyd County and 177 in Steuben County. Its mean temperature is 51.9°F.
- Carroll County: April 11 to October 26 (198 days, 0 WNV)
- Clinton County: April 11 to October 26 (198 days, 1 WNV)
- Hamilton County: April 11 to October 25 (197 days, 10 WNV)
- Rush County: April 11 to October 25 (197 days, 0 WNV)
West Nile in Hancock County
From 1999 to 2025, CDC ArboNET counted 8 human West Nile cases in Hancock County (7 neuroinvasive) across 6 years. The worst was 2012 with 2; the latest was 2025.
See how the dates are worked out, and when mosquitoes go away for the winter.