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

Mosquito months in Greenup County

In a normal year mosquito season in Greenup County, KY starts around April 5 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 Greenup County, and when

• Start tipping out standing water weekly by March 22.
• Book any yard treatment for early April, ahead of the July peak.
• Repellent can go away after October 31.
• 1 West Nile case since 2016 (last 2017): you should use repellent at dusk June to August, more so if over 60.

Greenup County against the rest of KY

Greenup County has the 81st longest season of 120 KY counties, at 209 days against 249 in Lyon County and 180 in Shelby County. Its mean temperature is 54.3°F.

• Russell County: April 6 to November 2 (210 days, 0 WNV)
• Bourbon County: April 5 to October 31 (209 days, 0 WNV)
• Johnson County: April 5 to October 31 (209 days, 0 WNV)
• Kenton County: April 5 to October 31 (209 days, 8 WNV)

West Nile in Greenup County

From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Greenup County (3 neuroinvasive) across 4 years. The worst was 2017 with 1; the latest was 2017.

Background: when mosquitoes go away for the winter; how the dates are worked out.