Mosquito season in Henry County, KY: when it starts and ends
Mosquito months in Henry County
In a normal year mosquito season in Henry County, KY starts around April 1 and ends around October 31, about 31 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Henry County, and when
- Start tipping out standing water weekly by March 18.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 31.
- 1 West Nile case since 2016 (last 2017): you should use repellent at dusk June to August, more so if over 60.
Henry County against the rest of KY
Henry County has the 55th longest season of 120 KY counties, at 214 days against 249 in Lyon County and 180 in Shelby County. Its mean temperature is 55°F.
- Pendleton County: April 3 to November 4 (215 days, 0 WNV)
- Oldham County: March 31 to October 31 (214 days, 0 WNV)
- Anderson County: April 3 to November 3 (214 days, 1 WNV)
- Bullitt County: April 4 to November 3 (213 days, 1 WNV)
West Nile in Henry County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Henry County (2 neuroinvasive) across 2 years. The worst was 2017 with 1; the latest was 2017.
Background: when mosquitoes go away for the winter; how the dates are worked out.