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

Mosquito months in Lafourche Parish

In a normal year mosquito season in Lafourche Parish, LA starts around January 28 and ends around January 3, about 49 weeks.

What to do in Lafourche Parish, and when

Start tipping out standing water weekly by January 14.
Book any yard treatment for late January, ahead of the August peak.
Repellent can go away after January 3.
8 West Nile cases since 2016 (last 2024): you should use repellent at dusk May to October, more so if over 60.

Lafourche Parish against the rest of LA

Lafourche Parish has the 10th longest season of 64 LA counties, at 340 days against 358 in Orleans Parish and 247 in Claiborne Parish. Its mean temperature is 69.4°F.

Terrebonne Parish: January 26 to January 2 (341 days, 4 WNV)
Calcasieu Parish: January 27 to January 3 (341 days, 16 WNV)
Evangeline Parish: February 5 to January 11 (340 days, 2 WNV)
St. James Parish: January 28 to January 1 (338 days, 2 WNV)

West Nile in Lafourche Parish

From 1999 to 2025, CDC ArboNET counted 25 human West Nile cases in Lafourche Parish (18 neuroinvasive) across 10 years. The worst was 2014 with 5; the latest was 2024.

See how the dates are worked out, and where mosquitoes never stop.