Mosquito season in Marshall County, IN: when it starts and ends
Mosquito months in Marshall County
In a normal year mosquito season in Marshall 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 Marshall 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.
- 1 West Nile case since 2016 (last 2017): you should use repellent at dusk July to August, more so if over 60.
Marshall County against the rest of IN
Marshall County has the 85th longest season of 92 IN counties, at 186 days against 231 in Floyd County and 177 in Steuben County. Its mean temperature is 49.9°F.
- Parke County: April 18 to October 22 (187 days, 0 WNV)
- Vermillion County: April 18 to October 22 (187 days, 0 WNV)
- Noble County: April 19 to October 21 (185 days, 0 WNV)
- Whitley County: April 19 to October 20 (185 days, 2 WNV)
West Nile in Marshall County
From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Marshall County (2 neuroinvasive) across 3 years. The worst was 2002 with 2; the latest was 2017.
See how the dates are worked out, and when the season starts across the US.