Mosquito season in Ocean County, NJ: when it starts and ends
Mosquito months in Ocean County
In a normal year mosquito season in Ocean County, NJ starts around April 14 and ends around October 29, about 28 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Ocean County, and when
- Start tipping out standing water weekly by March 31.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 29.
- 9 West Nile cases since 2016 (last 2024): you should use repellent at dusk July to August, more so if over 60.
Ocean County against the rest of NJ
Ocean County has the 14th longest season of 21 NJ counties, at 198 days against 217 in Cape May County and 184 in Sussex County. Its mean temperature is 53°F.
- Mercer County: April 10 to October 30 (204 days, 9 WNV)
- Essex County: April 11 to October 28 (199 days, 10 WNV)
- Hunterdon County: April 13 to October 26 (195 days, 6 WNV)
- Burlington County: April 15 to October 27 (195 days, 20 WNV)
West Nile in Ocean County
From 1999 to 2025, CDC ArboNET counted 25 human West Nile cases in Ocean County (14 neuroinvasive) across 11 years. The worst was 2012 with 9; the latest was 2024.
Background: reading the West Nile counts; how the dates are worked out.