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

Mosquito months in Jefferson Davis Parish

In a normal year mosquito season in Jefferson Davis Parish, LA starts around January 31 and ends around December 28, about 47 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 Jefferson Davis Parish, and when

• Start tipping out standing water weekly by January 17.
• Book any yard treatment for late January, ahead of the August peak.
• Repellent can go away after December 28.
• 3 West Nile cases since 2016 (last 2024): you should use repellent at dusk May to September, more so if over 60.

Jefferson Davis Parish against the rest of LA

Jefferson Davis Parish has the 17th longest season of 64 LA counties, at 331 days against 358 in Orleans Parish and 247 in Claiborne Parish. Its mean temperature is 67.9°F.

• Washington Parish: February 11 to January 11 (334 days, 10 WNV)
• Pointe Coupee Parish: January 31 to December 29 (332 days, 1 WNV)
• Vermilion Parish: January 29 to December 25 (330 days, 1 WNV)
• Ascension Parish: February 1 to December 28 (330 days, 19 WNV)

West Nile in Jefferson Davis Parish

From 1999 to 2025, CDC ArboNET counted 10 human West Nile cases in Jefferson Davis Parish (7 neuroinvasive) across 7 years. The worst was 2015 with 3; the latest was 2024.

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