Mosquito season in Spencer County, KY: when it starts and ends

Mosquito months in Spencer County

In a normal year mosquito season in Spencer County, KY starts around April 10 and ends around October 25, about 28 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in Spencer County, and when

• Start tipping out standing water weekly by March 27.
• Book any yard treatment for early April, ahead of the July peak.
• Repellent can go away after October 25.
• No West Nile cases since 2016, so bites in Spencer County are a nuisance; check window screens.

Spencer County against the rest of KY

Spencer County has the 108th longest season of 120 KY counties, at 198 days against 249 in Lyon County and 180 in Shelby County. Its mean temperature is 55.8°F.

• Owsley County: April 11 to October 28 (200 days, 0 WNV)
• Hart County: April 10 to October 26 (199 days, 0 WNV)
• Cumberland County: April 12 to October 27 (198 days, 0 WNV)
• Monroe County: April 12 to October 27 (198 days, 2 WNV)

West Nile in Spencer County

CDC ArboNET lists no human West Nile cases for Spencer County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 2 of those years.

More: how the dates are worked out · when mosquitoes go away for the winter.