Mosquito season in Barren County, KY: when it starts and ends
Mosquito months in Barren County
In a normal year mosquito season in Barren County, KY starts around March 28 and ends around November 5, about 32 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Barren County, and when
- Start tipping out standing water weekly by March 14.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 5.
- 2 West Nile cases since 2016 (last 2025): you should use repellent at dusk June to September, more so if over 60.
Barren County against the rest of KY
Barren County has the 23rd longest season of 120 KY counties, at 222 days against 249 in Lyon County and 180 in Shelby County. Its mean temperature is 59.3°F.
- Union County: March 26 to November 5 (224 days, 0 WNV)
- Hancock County: March 28 to November 7 (224 days, 0 WNV)
- Logan County: March 29 to November 6 (222 days, 1 WNV)
- Jessamine County: March 29 to November 5 (221 days, 0 WNV)
West Nile in Barren County
From 1999 to 2025, CDC ArboNET counted 9 human West Nile cases in Barren County (5 neuroinvasive) across 4 years. The worst was 2002 with 5; the latest was 2025.
Background: when mosquitoes go away for the winter; how the dates are worked out.