Mosquito season in Henry County, GA: when it starts and ends
Mosquito months in Henry County
In a normal year mosquito season in Henry County, GA starts around March 16 and ends around November 17, about 35 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Henry County, and when
- Start tipping out standing water weekly by March 2.
- Book any yard treatment for mid March, ahead of the July peak.
- Repellent can go away after November 17.
- 1 West Nile case since 2016 (last 2024): you should use repellent at dusk June to September, more so if over 60.
Henry County against the rest of GA
Henry County has the 124th longest season of 159 GA counties, at 246 days against 347 in Glynn County and 199 in Union County. Its mean temperature is 62.1°F.
- Haralson County: March 15 to November 16 (246 days, 0 WNV)
- Butts County: March 16 to November 17 (246 days, 0 WNV)
- Polk County: March 16 to November 15 (244 days, 1 WNV)
- Oglethorpe County: March 18 to November 17 (244 days, 0 WNV)
West Nile in Henry County
From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Henry County (2 neuroinvasive) across 3 years. The worst was 2007 with 2; the latest was 2024.
Background: when mosquitoes go away for the winter; how the dates are worked out.