Mosquito season in Williamsburg County, SC: when it starts and ends
Mosquito months in Williamsburg County
In a normal year mosquito season in Williamsburg County, SC starts around March 17 and ends around November 16, about 35 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Williamsburg County, and when
- Start tipping out standing water weekly by March 3.
- Book any yard treatment for mid March, ahead of the July peak.
- Repellent can go away after November 16.
- No West Nile cases since 2016, so bites in Williamsburg County are a nuisance; check window screens.
Williamsburg County against the rest of SC
Williamsburg County has the 34th longest season of 46 SC counties, at 244 days against 349 in Charleston County and 209 in Cherokee County. Its mean temperature is 63.8°F.
- Lee County: March 16 to November 16 (245 days, 0 WNV)
- Saluda County: March 17 to November 16 (244 days, 0 WNV)
- Darlington County: March 18 to November 17 (244 days, 1 WNV)
- Fairfield County: March 18 to November 17 (244 days, 0 WNV)
West Nile in Williamsburg County
CDC ArboNET lists no human West Nile cases for Williamsburg County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 2 of those years.
More: how the dates are worked out · when mosquitoes go away for the winter.