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

Mosquito months in Terrebonne Parish

In a normal year mosquito season in Terrebonne Parish, LA starts around January 26 and ends around January 2, about 49 weeks.

What to do in Terrebonne Parish, and when

Start tipping out standing water weekly by January 12.
Book any yard treatment for late January, ahead of the August peak.
Repellent can go away after January 2.
4 West Nile cases since 2016 (last 2023): you should use repellent at dusk May to October, more so if over 60.

Terrebonne Parish against the rest of LA

Terrebonne Parish has the 8th longest season of 64 LA counties, at 341 days against 358 in Orleans Parish and 247 in Claiborne Parish. Its mean temperature is 69.8°F.

Jefferson Parish: January 23 to January 7 (349 days, 7 WNV)
Cameron Parish: January 22 to January 3 (346 days, 0 WNV)
Calcasieu Parish: January 27 to January 3 (341 days, 16 WNV)
Lafourche Parish: January 28 to January 3 (340 days, 8 WNV)

West Nile in Terrebonne Parish

From 1999 to 2025, CDC ArboNET counted 11 human West Nile cases in Terrebonne Parish (6 neuroinvasive) across 7 years. The worst was 2003 with 3; the latest was 2023.

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