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

Mosquito months in Beaufort County

In a normal year mosquito season in Beaufort County, SC starts around February 9 and ends around December 28, about 46 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 Beaufort County, and when

• Start tipping out standing water weekly by January 26.
• Book any yard treatment for early February, ahead of the July peak.
• Repellent can go away after December 28.
• 3 West Nile cases since 2016 (last 2023): you should use repellent at dusk May to September, more so if over 60.

Beaufort County against the rest of SC

Beaufort County has the 3rd longest season of 46 SC counties, at 322 days against 349 in Charleston County and 209 in Cherokee County. Its mean temperature is 67.7°F.

• Charleston County: January 24 to January 8 (349 days, 11 WNV)
• Jasper County: February 8 to January 12 (338 days, 0 WNV)
• Hampton County: February 14 to December 15 (304 days, 0 WNV)
• Berkeley County: February 22 to December 13 (294 days, 1 WNV)

West Nile in Beaufort County

From 1999 to 2025, CDC ArboNET counted 3 human West Nile cases in Beaufort County (2 neuroinvasive) across 3 years. The worst was 2023 with 1; the latest was 2023.

More: how the dates are worked out · when mosquitoes go away for the winter.