Mosquito season in Lyon County, KY: when it starts and ends
Mosquito months in Lyon County
In a normal year mosquito season in Lyon County, KY starts around March 15 and ends around November 19, about 36 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Lyon County, and when
- Start tipping out standing water weekly by March 1.
- Book any yard treatment for mid March, ahead of the July peak.
- Repellent can go away after November 19.
- No West Nile cases since 2016, so bites in Lyon County are a nuisance; check window screens.
Lyon County against the rest of KY
Lyon County has the 1st longest season of 120 KY counties, at 249 days against 249 in Lyon County and 180 in Shelby County. Its mean temperature is 60.8°F.
- Trigg County: March 16 to November 13 (242 days, 0 WNV)
- Hopkins County: March 22 to November 12 (235 days, 4 WNV)
West Nile in Lyon County
CDC ArboNET lists no human West Nile cases for Lyon County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 2 of those years.
Background: when mosquitoes go away for the winter; how the dates are worked out.