Mosquito season in Plaquemines Parish, LA: when it starts and ends

Mosquito months in Plaquemines Parish

In a normal year mosquito season in Plaquemines Parish, LA starts around January 17 and ends around January 9, about 51 weeks.

What to do in Plaquemines Parish, and when

Start tipping out standing water weekly by January 3.
Book any yard treatment for mid January, ahead of the July peak.
Repellent can go away after January 9.
No West Nile cases since 2016, so bites in Plaquemines Parish are a nuisance; check window screens.

Plaquemines Parish against the rest of LA

Plaquemines Parish has the 2nd longest season of 64 LA counties, at 357 days against 358 in Orleans Parish and 247 in Claiborne Parish. Its mean temperature is 70.3°F.

Orleans Parish: January 18 to January 11 (358 days, 8 WNV)
St. Charles Parish: January 20 to January 7 (352 days, 2 WNV)
Iberia Parish: January 21 to January 6 (350 days, 5 WNV)

West Nile in Plaquemines Parish

CDC ArboNET lists no human West Nile cases for Plaquemines Parish from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 13 of those years.

Background: where mosquitoes never stop; how the dates are worked out.