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

Mosquito months in Ouachita Parish

In a normal year mosquito season in Ouachita Parish, LA starts around February 23 and ends around November 29, about 40 weeks.

What to do in Ouachita Parish, and when

Start tipping out standing water weekly by February 9.
Book any yard treatment for late February, ahead of the July peak.
Repellent can go away after November 29.
31 West Nile cases since 2016: you should wear EPA-registered repellent at dusk May to September, and check LA spray notices.

Ouachita Parish against the rest of LA

Ouachita Parish has the 50th longest season of 64 LA counties, at 279 days against 358 in Orleans Parish and 247 in Claiborne Parish. Its mean temperature is 65.3°F.

Jackson Parish: February 24 to December 1 (280 days, 1 WNV)
Lincoln Parish: February 24 to December 1 (280 days, 5 WNV)
Franklin Parish: February 23 to November 27 (277 days, 9 WNV)
East Feliciana Parish: February 27 to December 1 (277 days, 5 WNV)

West Nile in Ouachita Parish

From 1999 to 2025, CDC ArboNET counted 117 human West Nile cases in Ouachita Parish (77 neuroinvasive) across 20 years. The worst was 2013 with 20; the latest was 2025.

Background: reading the West Nile counts; how the dates are worked out.