Mosquito season in Lancaster County, SC: when it starts and ends
Mosquito months in Lancaster County
In a normal year mosquito season in Lancaster County, SC starts around March 15 and ends around November 20, about 36 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Lancaster County, and when
- Start tipping out standing water weekly by March 1.
- Book any yard treatment for mid March, ahead of the July peak.
- Repellent can go away after November 20.
- 1 West Nile case since 2016 (last 2023): you should use repellent at dusk June to September, more so if over 60.
Lancaster County against the rest of SC
Lancaster County has the 29th longest season of 46 SC counties, at 250 days against 349 in Charleston County and 209 in Cherokee County. Its mean temperature is 61.7°F.
- Allendale County: March 13 to November 19 (251 days, 1 WNV)
- Dillon County: March 14 to November 20 (251 days, 1 WNV)
- McCormick County: March 16 to November 20 (249 days, 0 WNV)
- Newberry County: March 18 to November 20 (247 days, 1 WNV)
West Nile in Lancaster County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Lancaster 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.