Mosquito season in Brown County, IN: when it starts and ends
Mosquito months in Brown County
In a normal year mosquito season in Brown 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 Brown 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 Brown County are a nuisance; check window screens.
Brown County against the rest of IN
Brown County has the 31st 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.
- Jennings County: April 8 to October 31 (206 days, 1 WNV)
- Lawrence County: April 7 to October 29 (205 days, 0 WNV)
- Franklin County: April 7 to October 28 (204 days, 0 WNV)
- Orange County: April 8 to October 29 (204 days, 1 WNV)
West Nile in Brown County
CDC ArboNET lists no human West Nile cases for Brown County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 12 of those years.
See how the dates are worked out, and when the season starts across the US.