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

Mosquito months in Nicholas County

In a normal year mosquito season in Nicholas County, KY starts around April 4 and ends around October 31, about 30 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 Nicholas County, and when

• Start tipping out standing water weekly by March 21.
• 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 Nicholas County are a nuisance; check window screens.

Nicholas County against the rest of KY

Nicholas County has the 71st longest season of 120 KY counties, at 210 days against 249 in Lyon County and 180 in Shelby County. Its mean temperature is 54.4°F.

• Fleming County: April 4 to November 1 (211 days, 0 WNV)
• Perry County: April 6 to November 3 (211 days, 0 WNV)
• Boone County: April 5 to November 1 (210 days, 1 WNV)
• Breathitt County: April 5 to November 1 (210 days, 1 WNV)

West Nile in Nicholas County

CDC ArboNET lists no human West Nile cases for Nicholas 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.