Mosquito season in Shelby County, KY: when it starts and ends
Mosquito months in Shelby County
In a normal year mosquito season in Shelby County, KY starts around April 24 and ends around October 21, about 26 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Shelby County, and when
- Start tipping out standing water weekly by April 10.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 21.
- No West Nile cases since 2016, so bites in Shelby County are a nuisance; check window screens.
Shelby County against the rest of KY
Shelby County has the 120th longest season of 120 KY counties, at 180 days against 249 in Lyon County and 180 in Shelby County. Its mean temperature is 53.7°F.
- Morgan County: April 17 to October 26 (192 days, 0 WNV)
- Clay County: April 17 to October 24 (190 days, 0 WNV)
West Nile in Shelby County
CDC ArboNET lists no human West Nile cases for Shelby County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 5 of those years.
See how the dates are worked out, and when the season starts across the US.