Mosquito season in Bossier Parish, LA: when it starts and ends
Mosquito months in Bossier Parish
In a normal year mosquito season in Bossier Parish, LA starts around February 28 and ends around November 29, about 39 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Bossier Parish, and when
- Start tipping out standing water weekly by February 14.
- Book any yard treatment for late February, ahead of the July peak.
- Repellent can go away after November 29.
- 19 West Nile cases since 2016: you should wear EPA-registered repellent at dusk May to September, and check LA spray notices.
Bossier Parish against the rest of LA
Bossier Parish has the 53rd longest season of 64 LA counties, at 274 days against 358 in Orleans Parish and 247 in Claiborne Parish. Its mean temperature is 64.5°F.
- Franklin Parish: February 23 to November 27 (277 days, 9 WNV)
- East Feliciana Parish: February 27 to December 1 (277 days, 5 WNV)
- Union Parish: March 2 to November 29 (272 days, 0 WNV)
- Webster Parish: March 1 to November 27 (271 days, 9 WNV)
West Nile in Bossier Parish
From 1999 to 2025, CDC ArboNET counted 77 human West Nile cases in Bossier Parish (48 neuroinvasive) across 19 years. The worst was 2012 with 17; the latest was 2025.
See how the dates are worked out, and reading the West Nile counts.