Mosquito season in Johnston County, NC: when it starts and ends
Mosquito months in Johnston County
In a normal year mosquito season in Johnston County, NC starts around March 16 and ends around November 17, about 35 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Johnston County, and when
- Start tipping out standing water weekly by March 2.
- Book any yard treatment for mid March, ahead of the July peak.
- Repellent can go away after November 17.
- 1 West Nile case since 2016 (last 2024): you should use repellent at dusk June to September, more so if over 60.
Johnston County against the rest of NC
Johnston County has the 36th longest season of 100 NC counties, at 246 days against 292 in Carteret County and 176 in Ashe County. Its mean temperature is 61.5°F.
- Onslow County: March 18 to November 21 (248 days, 1 WNV)
- Catawba County: March 13 to November 15 (247 days, 4 WNV)
- Montgomery County: March 16 to November 16 (245 days, 1 WNV)
- Stanly County: March 16 to November 16 (245 days, 0 WNV)
West Nile in Johnston County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Johnston County (1 neuroinvasive) across 1 year. The worst was 2024 with 1; the latest was 2024.
More: how the dates are worked out · when mosquitoes go away for the winter.