Mosquito season in Gloucester County, NJ: when it starts and ends

Mosquito months in Gloucester County

In a normal year mosquito season in Gloucester County, NJ starts around April 7 and ends around November 3, about 30 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in Gloucester County, and when

• Start tipping out standing water weekly by March 24.
• Book any yard treatment for early April, ahead of the July peak.
• Repellent can go away after November 3.
• 6 West Nile cases since 2016 (last 2025): you should use repellent at dusk June to August, more so if over 60.

Gloucester County against the rest of NJ

Gloucester County has the 6th longest season of 21 NJ counties, at 211 days against 217 in Cape May County and 184 in Sussex County. Its mean temperature is 55°F.

• Hudson County: April 7 to November 5 (212 days, 6 WNV)
• Camden County: April 6 to November 3 (211 days, 22 WNV)
• Union County: April 7 to November 3 (210 days, 10 WNV)
• Bergen County: April 9 to November 2 (208 days, 31 WNV)

West Nile in Gloucester County

From 1999 to 2025, CDC ArboNET counted 17 human West Nile cases in Gloucester County (11 neuroinvasive) across 13 years. The worst was 2012 with 3; the latest was 2025.

See how the dates are worked out, and reading the West Nile counts.