Mosquito season in Clay County, IN: when it starts and ends
Mosquito months in Clay County
In a normal year mosquito season in Clay County, IN starts around April 3 and ends around October 29, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Clay County, and when
- Start tipping out standing water weekly by March 20.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 29.
- 1 West Nile case since 2016 (last 2021): you should use repellent at dusk June to August, more so if over 60.
Clay County against the rest of IN
Clay County has the 21st longest season of 92 IN counties, at 209 days against 231 in Floyd County and 177 in Steuben County. Its mean temperature is 53.9°F.
- Washington County: April 4 to November 1 (211 days, 0 WNV)
- Harrison County: April 6 to November 2 (210 days, 0 WNV)
- Bartholomew County: April 4 to October 30 (209 days, 4 WNV)
- Scott County: April 5 to October 31 (209 days, 0 WNV)
West Nile in Clay County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Clay County (2 neuroinvasive) across 2 years. The worst was 2021 with 1; the latest was 2021.
See how the dates are worked out, and when mosquitoes go away for the winter.