Mosquito season in Vermillion County, IN: when it starts and ends
Mosquito months in Vermillion County
In a normal year mosquito season in Vermillion County, IN starts around April 18 and ends around October 22, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Vermillion County, and when
- Start tipping out standing water weekly by April 4.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 22.
- No West Nile cases since 2016, so bites in Vermillion County are a nuisance; check window screens.
Vermillion County against the rest of IN
Vermillion County has the 84th longest season of 92 IN counties, at 187 days against 231 in Floyd County and 177 in Steuben County. Its mean temperature is 51.9°F.
- Lake County: April 18 to October 22 (187 days, 21 WNV)
- Parke County: April 18 to October 22 (187 days, 0 WNV)
- Marshall County: April 18 to October 22 (186 days, 1 WNV)
- Noble County: April 19 to October 21 (185 days, 0 WNV)
West Nile in Vermillion County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Vermillion County (0 neuroinvasive) across 1 year. The worst was 2002 with 1; the latest was 2002.
See how the dates are worked out, and when mosquitoes go away for the winter.