Mosquito season in Salem County, NJ: when it starts and ends
Mosquito months in Salem County
In a normal year mosquito season in Salem County, NJ starts around April 4 and ends around November 5, about 31 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Salem County, and when
- Start tipping out standing water weekly by March 21.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after November 5.
- 1 West Nile case since 2016 (last 2024): you should use repellent at dusk June to August, more so if over 60.
Salem County against the rest of NJ
Salem County has the 2nd longest season of 21 NJ counties, at 215 days against 217 in Cape May County and 184 in Sussex County. Its mean temperature is 55.4°F.
- Cape May County: April 5 to November 8 (217 days, 4 WNV)
- Atlantic County: April 7 to November 6 (213 days, 8 WNV)
- Hudson County: April 7 to November 5 (212 days, 6 WNV)
West Nile in Salem County
From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Salem County (3 neuroinvasive) across 4 years. The worst was 2024 with 1; the latest was 2024.
See how the dates are worked out, and when mosquitoes go away for the winter.