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

Mosquito months in Berkeley County

In a normal year mosquito season in Berkeley County, SC starts around February 22 and ends around December 13, about 42 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 Berkeley County, and when

• Start tipping out standing water weekly by February 8.
• Book any yard treatment for late February, ahead of the July peak.
• Repellent can go away after December 13.
• 1 West Nile case since 2016 (last 2023): you should use repellent at dusk May to September, more so if over 60.

Berkeley County against the rest of SC

Berkeley County has the 5th longest season of 46 SC counties, at 294 days against 349 in Charleston County and 209 in Cherokee County. Its mean temperature is 66°F.

• Beaufort County: February 9 to December 28 (322 days, 3 WNV)
• Hampton County: February 14 to December 15 (304 days, 0 WNV)
• Georgetown County: February 25 to December 10 (288 days, 1 WNV)
• Richland County: February 24 to December 4 (283 days, 10 WNV)

West Nile in Berkeley County

From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Berkeley County (1 neuroinvasive) across 1 year. The worst was 2023 with 1; the latest was 2023.

Background: when the season starts across the US; how the dates are worked out.