Mosquito season in Burlington County, NJ: when it starts and ends
Mosquito months in Burlington County
In a normal year mosquito season in Burlington County, NJ starts around April 15 and ends around October 27, about 28 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Burlington County, and when
- Start tipping out standing water weekly by April 1.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 27.
- 20 West Nile cases since 2016: you should wear EPA-registered repellent at dusk June to August, and check NJ spray notices.
Burlington County against the rest of NJ
Burlington County has the 16th longest season of 21 NJ counties, at 195 days against 217 in Cape May County and 184 in Sussex County. Its mean temperature is 54°F.
- Ocean County: April 14 to October 29 (198 days, 9 WNV)
- Hunterdon County: April 13 to October 26 (195 days, 6 WNV)
- Somerset County: April 15 to October 26 (194 days, 9 WNV)
- Passaic County: April 17 to October 26 (192 days, 7 WNV)
West Nile in Burlington County
From 1999 to 2025, CDC ArboNET counted 40 human West Nile cases in Burlington County (25 neuroinvasive) across 14 years. The worst was 2021 with 8; the latest was 2025.
Background: reading the West Nile counts; how the dates are worked out.