Mosquito season in Greenville County, SC: when it starts and ends
Mosquito months in Greenville County
In a normal year mosquito season in Greenville County, SC starts around March 3 and ends around November 27, about 38 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Greenville County, and when
- Start tipping out standing water weekly by February 17.
- Book any yard treatment for early March, ahead of the July peak.
- Repellent can go away after November 27.
- 10 West Nile cases since 2016: you should wear EPA-registered repellent at dusk May to September, and check SC spray notices.
Greenville County against the rest of SC
Greenville County has the 15th longest season of 46 SC counties, at 269 days against 349 in Charleston County and 209 in Cherokee County. Its mean temperature is 62.2°F.
- Aiken County: March 4 to November 30 (271 days, 5 WNV)
- Barnwell County: March 5 to November 30 (270 days, 2 WNV)
- Bamberg County: March 3 to November 26 (268 days, 0 WNV)
- Florence County: March 4 to November 27 (268 days, 5 WNV)
West Nile in Greenville County
From 1999 to 2025, CDC ArboNET counted 14 human West Nile cases in Greenville County (13 neuroinvasive) across 9 years. The worst was 2023 with 3; the latest was 2024.
More: how the dates are worked out · reading the West Nile counts.