Mosquito season in Cobb County, GA: when it starts and ends
Mosquito months in Cobb County
In a normal year mosquito season in Cobb County, GA starts around March 14 and ends around November 19, about 36 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Cobb County, and when
- Start tipping out standing water weekly by February 28.
- Book any yard treatment for mid March, ahead of the July peak.
- Repellent can go away after November 19.
- 11 West Nile cases since 2016: you should wear EPA-registered repellent at dusk June to September, and check GA spray notices.
Cobb County against the rest of GA
Cobb County has the 114th longest season of 159 GA counties, at 250 days against 347 in Glynn County and 199 in Union County. Its mean temperature is 60.7°F.
- Walker County: March 11 to November 16 (250 days, 0 WNV)
- Columbia County: March 13 to November 18 (250 days, 5 WNV)
- Douglas County: March 14 to November 19 (250 days, 2 WNV)
- Dade County: March 11 to November 15 (249 days, 0 WNV)
West Nile in Cobb County
From 1999 to 2025, CDC ArboNET counted 39 human West Nile cases in Cobb County (24 neuroinvasive) across 16 years. The worst was 2012 with 9; the latest was 2024.
See how the dates are worked out, and reading the West Nile counts.