Mosquito season in Putnam County, IN: when it starts and ends
Mosquito months in Putnam County
In a normal year mosquito season in Putnam County, IN starts around April 15 and ends around October 22, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Putnam County, and when
- Start tipping out standing water weekly by April 1.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 22.
- No West Nile cases since 2016, so bites in Putnam County are a nuisance; check window screens.
Putnam County against the rest of IN
Putnam County has the 69th longest season of 92 IN counties, at 190 days against 231 in Floyd County and 177 in Steuben County. Its mean temperature is 50.5°F.
- Dearborn County: April 17 to October 25 (191 days, 0 WNV)
- Benton County: April 15 to October 22 (190 days, 0 WNV)
- Adams County: April 16 to October 23 (190 days, 0 WNV)
- Allen County: April 16 to October 23 (190 days, 11 WNV)
West Nile in Putnam County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Putnam County (1 neuroinvasive) across 1 year. The worst was 2014 with 1; the latest was 2014.
See how the dates are worked out, and when mosquitoes go away for the winter.