Mosquito season in Franklin County, KY: when it starts and ends
Mosquito months in Franklin County
In a normal year mosquito season in Franklin County, KY starts around April 3 and ends around November 4, about 31 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Franklin County, and when
- Start tipping out standing water weekly by March 20.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after November 4.
- 1 West Nile case since 2016 (last 2025): you should use repellent at dusk June to August, more so if over 60.
Franklin County against the rest of KY
Franklin County has the 52nd longest season of 120 KY counties, at 215 days against 249 in Lyon County and 180 in Shelby County. Its mean temperature is 56.1°F.
- Harlan County: April 1 to November 2 (215 days, 0 WNV)
- Rockcastle County: April 2 to November 3 (215 days, 0 WNV)
- Pendleton County: April 3 to November 4 (215 days, 0 WNV)
- Oldham County: March 31 to October 31 (214 days, 0 WNV)
West Nile in Franklin County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Franklin County (1 neuroinvasive) across 2 years. The worst was 2025 with 1; the latest was 2025.
Background: when the season starts across the US; how the dates are worked out.