Mosquito season in Lafayette Parish, LA: when it starts and ends
Mosquito months in Lafayette Parish
In a normal year mosquito season in Lafayette Parish, LA starts around February 5 and ends around December 14, about 45 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Lafayette Parish, and when
- Start tipping out standing water weekly by January 22.
- Book any yard treatment for early February, ahead of the August peak.
- Repellent can go away after December 14.
- 14 West Nile cases since 2016: you should wear EPA-registered repellent at dusk May to September, and check LA spray notices.
Lafayette Parish against the rest of LA
Lafayette Parish has the 28th longest season of 64 LA counties, at 312 days against 358 in Orleans Parish and 247 in Claiborne Parish. Its mean temperature is 68.2°F.
- Allen Parish: February 12 to January 4 (326 days, 4 WNV)
- St. Helena Parish: February 20 to January 3 (317 days, 0 WNV)
- East Baton Rouge Parish: February 6 to December 11 (308 days, 65 WNV)
- West Feliciana Parish: February 7 to December 10 (306 days, 1 WNV)
West Nile in Lafayette Parish
From 1999 to 2025, CDC ArboNET counted 41 human West Nile cases in Lafayette Parish (32 neuroinvasive) across 14 years. The worst was 2013 with 12; the latest was 2024.
More: how the dates are worked out · reading the West Nile counts.