Mosquito season in Franklin County, IN: when it starts and ends
Mosquito months in Franklin County
In a normal year mosquito season in Franklin County, IN starts around April 7 and ends around October 28, about 29 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Franklin County, and when
- Start tipping out standing water weekly by March 24.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 28.
- No West Nile cases since 2016, so bites in Franklin County are a nuisance; check window screens.
Franklin County against the rest of IN
Franklin County has the 32nd longest season of 92 IN counties, at 204 days against 231 in Floyd County and 177 in Steuben County. Its mean temperature is 53.1°F.
- Lawrence County: April 7 to October 29 (205 days, 0 WNV)
- Brown County: April 7 to October 28 (204 days, 0 WNV)
- Orange County: April 8 to October 29 (204 days, 1 WNV)
- Owen County: April 7 to October 27 (203 days, 0 WNV)
West Nile in Franklin County
CDC ArboNET lists no human West Nile cases for Franklin County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 10 of those years.
See how the dates are worked out, and when mosquitoes go away for the winter.