Mosquito season in Jefferson County, GA: when it starts and ends
Mosquito months in Jefferson County
In a normal year mosquito season in Jefferson County, GA starts around March 12 and ends around November 20, about 36 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Jefferson County, and when
- Start tipping out standing water weekly by February 26.
- Book any yard treatment for mid March, ahead of the July peak.
- Repellent can go away after November 20.
- No West Nile cases since 2016, so bites in Jefferson County are a nuisance; check window screens.
Jefferson County against the rest of GA
Jefferson County has the 111th longest season of 159 GA counties, at 253 days against 347 in Glynn County and 199 in Union County. Its mean temperature is 63.5°F.
- Warren County: March 13 to November 22 (254 days, 0 WNV)
- Hall County: March 12 to November 20 (253 days, 2 WNV)
- Walker County: March 11 to November 16 (250 days, 0 WNV)
- Columbia County: March 13 to November 18 (250 days, 5 WNV)
West Nile in Jefferson County
CDC ArboNET lists no human West Nile cases for Jefferson County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 1 of those years.
See how the dates are worked out, and when mosquitoes go away for the winter.