Mosquito season in Grayson County, KY: when it starts and ends
Mosquito months in Grayson County
In a normal year mosquito season in Grayson County, KY starts around April 14 and ends around October 24, about 28 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Grayson County, and when
- Start tipping out standing water weekly by March 31.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 24.
- No West Nile cases since 2016, so bites in Grayson County are a nuisance; check window screens.
Grayson County against the rest of KY
Grayson County has the 117th longest season of 120 KY counties, at 193 days against 249 in Lyon County and 180 in Shelby County. Its mean temperature is 54.5°F.
- Carter County: April 14 to October 26 (195 days, 0 WNV)
- Breckinridge County: April 14 to October 25 (194 days, 1 WNV)
- Morgan County: April 17 to October 26 (192 days, 0 WNV)
- Clay County: April 17 to October 24 (190 days, 0 WNV)
West Nile in Grayson County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Grayson County (0 neuroinvasive) across 1 year. The worst was 2002 with 2; the latest was 2002.
See how the dates are worked out, and when the season starts across the US.