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

Mosquito months in Letcher County

In a normal year mosquito season in Letcher County, KY starts around April 8 and ends around October 31, about 29 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 Letcher County, and when

• Start tipping out standing water weekly by March 25.
• Book any yard treatment for early April, ahead of the July peak.
• Repellent can go away after October 31.
• No West Nile cases since 2016, so bites in Letcher County are a nuisance; check window screens.

Letcher County against the rest of KY

Letcher County has the 95th longest season of 120 KY counties, at 206 days against 249 in Lyon County and 180 in Shelby County. Its mean temperature is 54.4°F.

• Estill County: April 7 to October 30 (206 days, 1 WNV)
• Knott County: April 8 to October 31 (206 days, 0 WNV)
• Floyd County: April 9 to October 31 (205 days, 0 WNV)
• Whitley County: April 11 to November 1 (204 days, 0 WNV)

West Nile in Letcher County

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

Background: when the season starts across the US; how the dates are worked out.