Mosquito season in Orange County, NC: when it starts and ends
Mosquito months in Orange County
In a normal year mosquito season in Orange County, NC starts around March 19 and ends around November 14, about 34 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Orange 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 14.
- 1 West Nile case since 2016 (last 2024): you should use repellent at dusk June to September, more so if over 60.
Orange County against the rest of NC
Orange County has the 46th longest season of 100 NC counties, at 240 days against 292 in Carteret County and 176 in Ashe County. Its mean temperature is 59.4°F.
- Richmond County: March 18 to November 16 (243 days, 0 WNV)
- Mecklenburg County: March 17 to November 14 (242 days, 18 WNV)
- Nash County: March 21 to November 16 (240 days, 0 WNV)
- Warren County: March 23 to November 17 (239 days, 0 WNV)
West Nile in Orange County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Orange County (1 neuroinvasive) across 1 year. The worst was 2024 with 1; the latest was 2024.
More: how the dates are worked out · when the season starts across the US.