Mosquito season in Marlboro County, SC: when it starts and ends
Mosquito months in Marlboro County
In a normal year mosquito season in Marlboro County, SC starts around March 12 and ends around November 21, about 36 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Marlboro County, and when
- Start tipping out standing water weekly by February 26.
- Book any yard treatment for mid March, ahead of the July peak.
- Repellent can go away after November 21.
- 1 West Nile case since 2016 (last 2018): you should use repellent at dusk May to September, more so if over 60.
Marlboro County against the rest of SC
Marlboro County has the 24th longest season of 46 SC counties, at 254 days against 349 in Charleston County and 209 in Cherokee County. Its mean temperature is 63°F.
- Anderson County: March 11 to November 24 (258 days, 5 WNV)
- Greenwood County: March 12 to November 25 (258 days, 3 WNV)
- Abbeville County: March 13 to November 22 (254 days, 0 WNV)
- Sumter County: March 13 to November 21 (253 days, 3 WNV)
West Nile in Marlboro County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Marlboro County (2 neuroinvasive) across 2 years. The worst was 2018 with 1; the latest was 2018.
Background: when mosquitoes go away for the winter; how the dates are worked out.