Mosquito season in Aiken County, SC: when it starts and ends
Mosquito months in Aiken County
In a normal year mosquito season in Aiken County, SC starts around March 4 and ends around November 30, about 39 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Aiken County, and when
- Start tipping out standing water weekly by February 18.
- Book any yard treatment for early March, ahead of the July peak.
- Repellent can go away after November 30.
- 5 West Nile cases since 2016 (last 2025): you should use repellent at dusk May to September, more so if over 60.
Aiken County against the rest of SC
Aiken County has the 13th longest season of 46 SC counties, at 271 days against 349 in Charleston County and 209 in Cherokee County. Its mean temperature is 63.8°F.
- Edgefield County: February 28 to December 1 (276 days, 0 WNV)
- Colleton County: March 1 to November 28 (272 days, 0 WNV)
- Barnwell County: March 5 to November 30 (270 days, 2 WNV)
- Greenville County: March 3 to November 27 (269 days, 10 WNV)
West Nile in Aiken County
From 1999 to 2025, CDC ArboNET counted 13 human West Nile cases in Aiken County (5 neuroinvasive) across 6 years. The worst was 2012 with 6; the latest was 2025.
See how the dates are worked out, and reading the West Nile counts.