Mosquito season in DeKalb County, IN: when it starts and ends
Mosquito months in DeKalb County
In a normal year mosquito season in DeKalb County, IN starts around April 22 and ends around October 19, about 26 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in DeKalb County, and when
- Start tipping out standing water weekly by April 8.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 19.
- No West Nile cases since 2016, so bites in DeKalb County are a nuisance; check window screens.
DeKalb County against the rest of IN
DeKalb County has the 91st longest season of 92 IN counties, at 180 days against 231 in Floyd County and 177 in Steuben County. Its mean temperature is 49°F.
- Huntington County: April 20 to October 21 (184 days, 1 WNV)
- St. Joseph County: April 21 to October 20 (182 days, 2 WNV)
- Steuben County: April 23 to October 17 (177 days, 0 WNV)
West Nile in DeKalb County
From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in DeKalb County (0 neuroinvasive) across 2 years. The worst was 2003 with 2; the latest was 2003.
More: how the dates are worked out · when mosquitoes go away for the winter.