Mosquito season in Onslow County, NC: when it starts and ends
Mosquito months in Onslow County
In a normal year mosquito season in Onslow County, NC starts around March 18 and ends around November 21, about 35 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Onslow County, and when
- Start tipping out standing water weekly by March 4.
- Book any yard treatment for mid March, ahead of the July peak.
- Repellent can go away after November 21.
- 1 West Nile case since 2016 (last 2024): you should use repellent at dusk June to September, more so if over 60.
Onslow County against the rest of NC
Onslow County has the 34th longest season of 100 NC counties, at 248 days against 292 in Carteret County and 176 in Ashe County. Its mean temperature is 62.6°F.
- Harnett County: March 14 to November 17 (248 days, 0 WNV)
- Pamlico County: March 17 to November 20 (248 days, 0 WNV)
- Catawba County: March 13 to November 15 (247 days, 4 WNV)
- Johnston County: March 16 to November 17 (246 days, 1 WNV)
West Nile in Onslow County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Onslow County (2 neuroinvasive) across 2 years. The worst was 2024 with 1; the latest was 2024.
Background: when the season starts across the US; how the dates are worked out.