Mosquito season in Florence County, SC: when it starts and ends
Mosquito months in Florence County
In a normal year mosquito season in Florence County, SC starts around March 4 and ends around November 27, about 38 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Florence County, and when
- Start tipping out standing water weekly by February 18.
- Book any yard treatment for early March, ahead of the July peak.
- Repellent can go away after November 27.
- 5 West Nile cases since 2016 (last 2023): you should use repellent at dusk May to September, more so if over 60.
Florence County against the rest of SC
Florence County has the 17th longest season of 46 SC counties, at 268 days against 349 in Charleston County and 209 in Cherokee County. Its mean temperature is 64.4°F.
- Greenville County: March 3 to November 27 (269 days, 10 WNV)
- Bamberg County: March 3 to November 26 (268 days, 0 WNV)
- Dorchester County: March 7 to November 29 (267 days, 4 WNV)
- Marion County: March 4 to November 24 (265 days, 0 WNV)
West Nile in Florence County
From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in Florence County (5 neuroinvasive) across 3 years. The worst was 2018 with 3; the latest was 2023.
Background: reading the West Nile counts; how the dates are worked out.