Mosquito season in West Baton Rouge Parish, LA: when it starts and ends
Mosquito months in West Baton Rouge Parish
In a normal year mosquito season in West Baton Rouge Parish, LA starts around February 8 and ends around December 9, about 43 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in West Baton Rouge Parish, and when
- Start tipping out standing water weekly by January 25.
- Book any yard treatment for early February, ahead of the July peak.
- Repellent can go away after December 9.
- 6 West Nile cases since 2016 (last 2025): you should use repellent at dusk May to September, more so if over 60.
West Baton Rouge Parish against the rest of LA
West Baton Rouge Parish has the 35th longest season of 64 LA counties, at 304 days against 358 in Orleans Parish and 247 in Claiborne Parish. Its mean temperature is 67.5°F.
- Richland Parish: February 9 to December 11 (305 days, 1 WNV)
- Iberville Parish: February 8 to December 9 (304 days, 4 WNV)
- Caddo Parish: February 11 to December 10 (302 days, 47 WNV)
- Madison Parish: February 13 to December 10 (300 days, 1 WNV)
West Nile in West Baton Rouge Parish
From 1999 to 2025, CDC ArboNET counted 19 human West Nile cases in West Baton Rouge Parish (10 neuroinvasive) across 10 years. The worst was 2012 with 5; the latest was 2025.
Background: reading the West Nile counts; how the dates are worked out.