Mosquito season in St. James Parish, LA: when it starts and ends

Mosquito months in St. James Parish

In a normal year mosquito season in St. James Parish, LA starts around January 28 and ends around January 1, about 48 weeks.

What to do in St. James Parish, and when

Start tipping out standing water weekly by January 14.
Book any yard treatment for late January, ahead of the July peak.
Repellent can go away after January 1.
2 West Nile cases since 2016 (last 2018): you should use repellent at dusk May to October, more so if over 60.

St. James Parish against the rest of LA

St. James Parish has the 12th longest season of 64 LA counties, at 338 days against 358 in Orleans Parish and 247 in Claiborne Parish. Its mean temperature is 69°F.

Lafourche Parish: January 28 to January 3 (340 days, 8 WNV)
Evangeline Parish: February 5 to January 11 (340 days, 2 WNV)
St. John the Baptist Parish: January 28 to January 1 (338 days, 2 WNV)
Beauregard Parish: February 12 to January 13 (335 days, 2 WNV)

West Nile in St. James Parish

From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in St. James Parish (4 neuroinvasive) across 2 years. The worst was 2002 with 3; the latest was 2018.

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