Mosquito season in Hendricks County, IN: when it starts and ends
Mosquito months in Hendricks County
In a normal year mosquito season in Hendricks County, IN starts around April 9 and ends around October 27, about 29 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Hendricks County, and when
- Start tipping out standing water weekly by March 26.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 27.
- 1 West Nile case since 2016 (last 2018): you should use repellent at dusk June to August, more so if over 60.
Hendricks County against the rest of IN
Hendricks County has the 38th longest season of 92 IN counties, at 201 days against 231 in Floyd County and 177 in Steuben County. Its mean temperature is 52.6°F.
- Ohio County: April 11 to October 31 (203 days, 1 WNV)
- Marion County: April 8 to October 27 (202 days, 18 WNV)
- Madison County: April 9 to October 27 (201 days, 2 WNV)
- Boone County: April 10 to October 26 (199 days, 1 WNV)
West Nile in Hendricks County
From 1999 to 2025, CDC ArboNET counted 3 human West Nile cases in Hendricks County (2 neuroinvasive) across 3 years. The worst was 2018 with 1; the latest was 2018.
See how the dates are worked out, and when mosquitoes go away for the winter.