Mosquito season in Durham County, NC: when it starts and ends
Mosquito months in Durham County
In a normal year mosquito season in Durham County, NC starts around March 19 and ends around November 12, about 34 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Durham County, and when
- Start tipping out standing water weekly by March 5.
- Book any yard treatment for mid March, ahead of the July peak.
- Repellent can go away after November 12.
- 4 West Nile cases since 2016 (last 2025): you should use repellent at dusk June to September, more so if over 60.
Durham County against the rest of NC
Durham County has the 49th longest season of 100 NC counties, at 238 days against 292 in Carteret County and 176 in Ashe County. Its mean temperature is 58.7°F.
- Nash County: March 21 to November 16 (240 days, 0 WNV)
- Warren County: March 23 to November 17 (239 days, 0 WNV)
- Alamance County: March 20 to November 13 (238 days, 1 WNV)
- Cabarrus County: March 20 to November 13 (238 days, 3 WNV)
West Nile in Durham County
From 1999 to 2025, CDC ArboNET counted 7 human West Nile cases in Durham County (7 neuroinvasive) across 5 years. The worst was 2025 with 3; the latest was 2025.
Background: reading the West Nile counts; how the dates are worked out.