Mosquito season in Dillon County, SC: when it starts and ends
Mosquito months in Dillon County
In a normal year mosquito season in Dillon County, SC starts around March 14 and ends around November 20, about 36 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Dillon County, and when
- Start tipping out standing water weekly by February 28.
- Book any yard treatment for mid March, ahead of the July peak.
- Repellent can go away after November 20.
- 1 West Nile case since 2016 (last 2024): you should use repellent at dusk May to September, more so if over 60.
Dillon County against the rest of SC
Dillon County has the 28th longest season of 46 SC counties, at 251 days against 349 in Charleston County and 209 in Cherokee County. Its mean temperature is 62.7°F.
- Sumter County: March 13 to November 21 (253 days, 3 WNV)
- Allendale County: March 13 to November 19 (251 days, 1 WNV)
- Lancaster County: March 15 to November 20 (250 days, 1 WNV)
- McCormick County: March 16 to November 20 (249 days, 0 WNV)
West Nile in Dillon County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Dillon County (1 neuroinvasive) across 2 years. The worst was 2024 with 1; the latest was 2024.
Background: when mosquitoes go away for the winter; how the dates are worked out.