Mosquito season in Gibson County, IN: when it starts and ends
Mosquito months in Gibson County
In a normal year mosquito season in Gibson County, IN starts around April 2 and ends around November 1, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Gibson County, and when
- Start tipping out standing water weekly by March 19.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after November 1.
- No West Nile cases since 2016, so bites in Gibson County are a nuisance; check window screens.
Gibson County against the rest of IN
Gibson County has the 15th longest season of 92 IN counties, at 213 days against 231 in Floyd County and 177 in Steuben County. Its mean temperature is 55.1°F.
- Sullivan County: April 1 to November 1 (214 days, 2 WNV)
- Martin County: April 2 to November 2 (214 days, 0 WNV)
- Vigo County: April 1 to October 30 (212 days, 0 WNV)
- Switzerland County: April 4 to November 2 (212 days, 0 WNV)
West Nile in Gibson County
From 1999 to 2025, CDC ArboNET counted 7 human West Nile cases in Gibson County (5 neuroinvasive) across 1 year. The worst was 2002 with 7; the latest was 2002.
Background: when the season starts across the US; how the dates are worked out.