Mosquito season in York County, SC: when it starts and ends
Mosquito months in York County
In a normal year mosquito season in York County, SC starts around March 21 and ends around November 14, about 34 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in York County, and when
- Start tipping out standing water weekly by March 7.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 14.
- 6 West Nile cases since 2016 (last 2025): you should use repellent at dusk June to September, more so if over 60.
York County against the rest of SC
York County has the 41st longest season of 46 SC counties, at 238 days against 349 in Charleston County and 209 in Cherokee County. Its mean temperature is 60.2°F.
- Pickens County: March 20 to November 15 (240 days, 1 WNV)
- Chester County: March 20 to November 13 (238 days, 1 WNV)
- Chesterfield County: March 21 to November 13 (237 days, 0 WNV)
- Spartanburg County: March 24 to November 11 (232 days, 4 WNV)
West Nile in York County
From 1999 to 2025, CDC ArboNET counted 6 human West Nile cases in York County (6 neuroinvasive) across 5 years. The worst was 2017 with 2; the latest was 2025.
More: how the dates are worked out · reading the West Nile counts.