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

Mosquito months in Calhoun County

In a normal year mosquito season in Calhoun County, SC starts around February 23 and ends around December 2, about 40 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 Calhoun County, and when

• Start tipping out standing water weekly by February 9.
• Book any yard treatment for late February, ahead of the July peak.
• Repellent can go away after December 2.
• No West Nile cases since 2016, so bites in Calhoun County are a nuisance; check window screens.

Calhoun County against the rest of SC

Calhoun County has the 8th longest season of 46 SC counties, at 282 days against 349 in Charleston County and 209 in Cherokee County. Its mean temperature is 64.9°F.

• Georgetown County: February 25 to December 10 (288 days, 1 WNV)
• Richland County: February 24 to December 4 (283 days, 10 WNV)
• Horry County: February 28 to December 7 (282 days, 11 WNV)
• Orangeburg County: February 28 to December 6 (281 days, 0 WNV)

West Nile in Calhoun County

CDC ArboNET lists no human West Nile cases for Calhoun County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 2 of those years.

See how the dates are worked out, and when mosquitoes go away for the winter.