Mosquito season in East Baton Rouge Parish, LA: when it starts and ends
Mosquito months in East Baton Rouge Parish
In a normal year mosquito season in East Baton Rouge Parish, LA starts around February 6 and ends around December 11, about 44 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in East Baton Rouge Parish, and when
- Start tipping out standing water weekly by January 23.
- Book any yard treatment for early February, ahead of the July peak.
- Repellent can go away after December 11.
- 65 West Nile cases since 2016: you should wear EPA-registered repellent at dusk May to September, and check LA spray notices.
East Baton Rouge Parish against the rest of LA
East Baton Rouge Parish has the 29th longest season of 64 LA counties, at 308 days against 358 in Orleans Parish and 247 in Claiborne Parish. Its mean temperature is 68.4°F.
- St. Helena Parish: February 20 to January 3 (317 days, 0 WNV)
- Lafayette Parish: February 5 to December 14 (312 days, 14 WNV)
- West Feliciana Parish: February 7 to December 10 (306 days, 1 WNV)
- Grant Parish: February 11 to December 14 (306 days, 2 WNV)
West Nile in East Baton Rouge Parish
From 1999 to 2025, CDC ArboNET counted 293 human West Nile cases in East Baton Rouge Parish (177 neuroinvasive) across 21 years. The worst was 2002 with 50; the latest was 2025.
Background: reading the West Nile counts; how the dates are worked out.