Mosquito season in Butler County, KY: when it starts and ends
Mosquito months in Butler County
In a normal year mosquito season in Butler County, KY starts around April 2 and ends around October 30, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Butler County, and when
- Start tipping out standing water weekly by March 19.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 30.
- No West Nile cases since 2016, so bites in Butler County are a nuisance; check window screens.
Butler County against the rest of KY
Butler County has the 62nd longest season of 120 KY counties, at 211 days against 249 in Lyon County and 180 in Shelby County. Its mean temperature is 56.7°F.
- Madison County: April 3 to November 1 (212 days, 1 WNV)
- Marshall County: March 31 to October 28 (211 days, 0 WNV)
- Muhlenberg County: April 2 to October 30 (211 days, 0 WNV)
- Bath County: April 3 to October 31 (211 days, 0 WNV)
West Nile in Butler County
CDC ArboNET lists no human West Nile cases for Butler County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 1 of those years.
See how the dates are worked out, and when mosquitoes go away for the winter.