Mosquito season in Elkhart County, IN: when it starts and ends
Mosquito months in Elkhart County
In a normal year mosquito season in Elkhart County, IN starts around April 17 and ends around October 22, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Elkhart County, and when
- Start tipping out standing water weekly by April 3.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 22.
- 8 West Nile cases since 2016 (last 2025): you should use repellent at dusk June to August, more so if over 60.
Elkhart County against the rest of IN
Elkhart County has the 76th longest season of 92 IN counties, at 189 days against 231 in Floyd County and 177 in Steuben County. Its mean temperature is 50.2°F.
- Jay County: April 16 to October 22 (189 days, 2 WNV)
- Wells County: April 16 to October 22 (189 days, 2 WNV)
- Fulton County: April 17 to October 22 (189 days, 0 WNV)
- Kosciusko County: April 17 to October 22 (188 days, 3 WNV)
West Nile in Elkhart County
From 1999 to 2025, CDC ArboNET counted 42 human West Nile cases in Elkhart County (18 neuroinvasive) across 13 years. The worst was 2002 with 23; the latest was 2025.
See how the dates are worked out, and reading the West Nile counts.