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

Mosquito months in Russell County

In a normal year mosquito season in Russell County, KY starts around April 6 and ends around November 2, 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 Russell County, and when

• Start tipping out standing water weekly by March 23.
• Book any yard treatment for early April, ahead of the July peak.
• Repellent can go away after November 2.
• No West Nile cases since 2016, so bites in Russell County are a nuisance; check window screens.

Russell County against the rest of KY

Russell County has the 79th longest season of 120 KY counties, at 210 days against 249 in Lyon County and 180 in Shelby County. Its mean temperature is 55.5°F.

• Martin County: April 5 to November 1 (210 days, 0 WNV)
• Adair County: April 6 to November 2 (210 days, 0 WNV)
• Bourbon County: April 5 to October 31 (209 days, 0 WNV)
• Greenup County: April 5 to October 31 (209 days, 1 WNV)

West Nile in Russell County

From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Russell County (0 neuroinvasive) across 1 year. The worst was 2004 with 2; the latest was 2004.

See how the dates are worked out, and when mosquitoes go away for the winter.