Mosquito season in Dorchester County, SC: when it starts and ends

Mosquito months in Dorchester County

In a normal year mosquito season in Dorchester County, SC starts around March 7 and ends around November 29, about 38 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in Dorchester County, and when

• Start tipping out standing water weekly by February 21.
• Book any yard treatment for early March, ahead of the July peak.
• Repellent can go away after November 29.
• 4 West Nile cases since 2016 (last 2018): you should use repellent at dusk May to September, more so if over 60.

Dorchester County against the rest of SC

Dorchester County has the 18th longest season of 46 SC counties, at 267 days against 349 in Charleston County and 209 in Cherokee County. Its mean temperature is 63.9°F.

• Bamberg County: March 3 to November 26 (268 days, 0 WNV)
• Florence County: March 4 to November 27 (268 days, 5 WNV)
• Marion County: March 4 to November 24 (265 days, 0 WNV)
• Kershaw County: March 11 to November 27 (261 days, 1 WNV)

West Nile in Dorchester County

From 1999 to 2025, CDC ArboNET counted 7 human West Nile cases in Dorchester County (7 neuroinvasive) across 5 years. The worst was 2016 with 3; the latest was 2018.

See how the dates are worked out, and reading the West Nile counts.