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

Mosquito months in St. Landry Parish

In a normal year mosquito season in St. Landry Parish, LA starts around February 6 and ends around December 8, about 44 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in St. Landry Parish, and when

• Start tipping out standing water weekly by January 23.
• Book any yard treatment for early February, ahead of the August peak.
• Repellent can go away after December 8.
• 3 West Nile cases since 2016 (last 2024): you should use repellent at dusk May to September, more so if over 60.

St. Landry Parish against the rest of LA

St. Landry Parish has the 32nd longest season of 64 LA counties, at 305 days against 358 in Orleans Parish and 247 in Claiborne Parish. Its mean temperature is 68.4°F.

• West Feliciana Parish: February 7 to December 10 (306 days, 1 WNV)
• Grant Parish: February 11 to December 14 (306 days, 2 WNV)
• Richland Parish: February 9 to December 11 (305 days, 1 WNV)
• Iberville Parish: February 8 to December 9 (304 days, 4 WNV)

West Nile in St. Landry Parish

From 1999 to 2025, CDC ArboNET counted 14 human West Nile cases in St. Landry Parish (9 neuroinvasive) across 9 years. The worst was 2004 with 4; the latest was 2024.

See how the dates are worked out, and when mosquitoes go away for the winter.