Mosquito season in St. Bernard Parish, LA: when it starts and ends

Mosquito months in St. Bernard Parish

In a normal year mosquito season in St. Bernard Parish, LA starts around February 2 and ends around December 25, about 47 weeks.

What to do in St. Bernard Parish, and when

Start tipping out standing water weekly by January 19.
Book any yard treatment for early February, ahead of the July peak.
Repellent can go away after December 25.
No West Nile cases since 2016, so bites in St. Bernard Parish are a nuisance; check window screens.

St. Bernard Parish against the rest of LA

St. Bernard Parish has the 25th longest season of 64 LA counties, at 326 days against 358 in Orleans Parish and 247 in Claiborne Parish. Its mean temperature is 67.8°F.

Avoyelles Parish: February 7 to January 2 (329 days, 1 WNV)
Natchitoches Parish: February 8 to January 3 (329 days, 2 WNV)
Allen Parish: February 12 to January 4 (326 days, 4 WNV)
St. Helena Parish: February 20 to January 3 (317 days, 0 WNV)

West Nile in St. Bernard Parish

From 1999 to 2025, CDC ArboNET counted 8 human West Nile cases in St. Bernard Parish (2 neuroinvasive) across 5 years. The worst was 2006 with 2; the latest was 2012.

More: how the dates are worked out · when mosquitoes go away for the winter.