Mosquito season in Decatur County, IN: when it starts and ends
Mosquito months in Decatur County
In a normal year mosquito season in Decatur County, IN starts around April 5 and ends around October 29, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Decatur County, and when
- Start tipping out standing water weekly by March 22.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 29.
- No West Nile cases since 2016, so bites in Decatur County are a nuisance; check window screens.
Decatur County against the rest of IN
Decatur County has the 24th longest season of 92 IN counties, at 207 days against 231 in Floyd County and 177 in Steuben County. Its mean temperature is 53.6°F.
- Bartholomew County: April 4 to October 30 (209 days, 4 WNV)
- Scott County: April 5 to October 31 (209 days, 0 WNV)
- Delaware County: April 6 to October 30 (207 days, 6 WNV)
- Pike County: April 7 to October 31 (207 days, 0 WNV)
West Nile in Decatur County
CDC ArboNET lists no human West Nile cases for Decatur County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 14 of those years.
See how the dates are worked out, and when the season starts across the US.