Mosquito season in Fairfield County, SC: when it starts and ends
Mosquito months in Fairfield County
In a normal year mosquito season in Fairfield County, SC starts around March 18 and ends around November 17, about 35 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Fairfield County, and when
- Start tipping out standing water weekly by March 4.
- Book any yard treatment for mid March, ahead of the July peak.
- Repellent can go away after November 17.
- No West Nile cases since 2016, so bites in Fairfield County are a nuisance; check window screens.
Fairfield County against the rest of SC
Fairfield County has the 36th longest season of 46 SC counties, at 244 days against 349 in Charleston County and 209 in Cherokee County. Its mean temperature is 61.1°F.
- Williamsburg County: March 17 to November 16 (244 days, 0 WNV)
- Darlington County: March 18 to November 17 (244 days, 1 WNV)
- Laurens County: March 18 to November 17 (244 days, 1 WNV)
- Lexington County: March 17 to November 14 (242 days, 6 WNV)
West Nile in Fairfield County
CDC ArboNET lists no human West Nile cases for Fairfield County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 4 of those years.
Background: when mosquitoes go away for the winter; how the dates are worked out.