Mosquito season in Cass County, IN: when it starts and ends
Mosquito months in Cass County
In a normal year mosquito season in Cass County, IN starts around April 14 and ends around October 24, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Cass County, and when
- Start tipping out standing water weekly by March 31.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 24.
- No West Nile cases since 2016, so bites in Cass County are a nuisance; check window screens.
Cass County against the rest of IN
Cass County has the 58th longest season of 92 IN counties, at 192 days against 231 in Floyd County and 177 in Steuben County. Its mean temperature is 51°F.
- Tipton County: April 14 to October 24 (193 days, 1 WNV)
- Wabash County: April 14 to October 24 (193 days, 0 WNV)
- Fayette County: April 14 to October 23 (192 days, 0 WNV)
- Porter County: April 15 to October 24 (192 days, 10 WNV)
West Nile in Cass County
CDC ArboNET lists no human West Nile cases for Cass County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 11 of those years.
Background: when the season starts across the US; how the dates are worked out.