Mosquito season in Marshall County, KY: when it starts and ends
Mosquito months in Marshall County
In a normal year mosquito season in Marshall County, KY starts around March 31 and ends around October 28, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Marshall County, and when
- Start tipping out standing water weekly by March 17.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after October 28.
- No West Nile cases since 2016, so bites in Marshall County are a nuisance; check window screens.
Marshall County against the rest of KY
Marshall County has the 61st longest season of 120 KY counties, at 211 days against 249 in Lyon County and 180 in Shelby County. Its mean temperature is 57°F.
- Wayne County: April 4 to November 3 (213 days, 1 WNV)
- Madison County: April 3 to November 1 (212 days, 1 WNV)
- Butler County: April 2 to October 30 (211 days, 0 WNV)
- Muhlenberg County: April 2 to October 30 (211 days, 0 WNV)
West Nile in Marshall County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Marshall County (1 neuroinvasive) across 1 year. The worst was 2009 with 1; the latest was 2009.
Background: when mosquitoes go away for the winter; how the dates are worked out.