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

Mosquito months in Allen Parish

In a normal year mosquito season in Allen Parish, LA starts around February 12 and ends around January 4, about 47 weeks.

What to do in Allen Parish, and when

Start tipping out standing water weekly by January 29.
Book any yard treatment for mid February, ahead of the August peak.
Repellent can go away after January 4.
4 West Nile cases since 2016 (last 2025): you should use repellent at dusk May to September, more so if over 60.

Allen Parish against the rest of LA

Allen Parish has the 26th longest season of 64 LA counties, at 326 days against 358 in Orleans Parish and 247 in Claiborne Parish. Its mean temperature is 66.6°F.

Natchitoches Parish: February 8 to January 3 (329 days, 2 WNV)
St. Bernard Parish: February 2 to December 25 (326 days, 0 WNV)
St. Helena Parish: February 20 to January 3 (317 days, 0 WNV)
Lafayette Parish: February 5 to December 14 (312 days, 14 WNV)

West Nile in Allen Parish

From 1999 to 2025, CDC ArboNET counted 9 human West Nile cases in Allen Parish (6 neuroinvasive) across 8 years. The worst was 2025 with 2; the latest was 2025.

See how the dates are worked out, and reading the West Nile counts.