Mosquito season in Washington County, GA: when it starts and ends
Mosquito months in Washington County
In a normal year mosquito season in Washington County, GA starts around March 2 and ends around November 29, about 39 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Washington County, and when
- Start tipping out standing water weekly by February 16.
- Book any yard treatment for early March, ahead of the July peak.
- Repellent can go away after November 29.
- 1 West Nile case since 2016 (last 2025): you should use repellent at dusk May to September, more so if over 60.
Washington County against the rest of GA
Washington County has the 71st longest season of 159 GA counties, at 272 days against 347 in Glynn County and 199 in Union County. Its mean temperature is 63.9°F.
- Calhoun County: February 27 to November 26 (272 days, 0 WNV)
- Spalding County: March 2 to November 29 (272 days, 0 WNV)
- Lamar County: March 4 to November 29 (270 days, 1 WNV)
- Monroe County: March 4 to November 29 (270 days, 0 WNV)
West Nile in Washington County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Washington County (1 neuroinvasive) across 1 year. The worst was 2025 with 1; the latest was 2025.
Background: when mosquitoes go away for the winter; how the dates are worked out.