Mosquito season in Anderson County, KY: when it starts and ends
Mosquito months in Anderson County
In a normal year mosquito season in Anderson County, KY starts around April 3 and ends around November 3, about 31 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Anderson 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 November 3.
- 1 West Nile case since 2016 (last 2025): you should use repellent at dusk June to August, more so if over 60.
Anderson County against the rest of KY
Anderson County has the 56th longest season of 120 KY counties, at 214 days against 249 in Lyon County and 180 in Shelby County. Its mean temperature is 55.9°F.
- Oldham County: March 31 to October 31 (214 days, 0 WNV)
- Henry County: April 1 to October 31 (214 days, 1 WNV)
- Bullitt County: April 4 to November 3 (213 days, 1 WNV)
- Larue County: April 4 to November 3 (213 days, 0 WNV)
West Nile in Anderson County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Anderson County (1 neuroinvasive) across 2 years. The worst was 2025 with 1; the latest was 2025.
See how the dates are worked out, and when mosquitoes go away for the winter.