Mosquito season in Webster Parish, LA: when it starts and ends
Mosquito months in Webster Parish
In a normal year mosquito season in Webster Parish, LA starts around March 1 and ends around November 27, about 39 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Webster Parish, and when
- Start tipping out standing water weekly by February 15.
- Book any yard treatment for early March, ahead of the July peak.
- Repellent can go away after November 27.
- 9 West Nile cases since 2016 (last 2025): you should use repellent at dusk May to September, more so if over 60.
Webster Parish against the rest of LA
Webster Parish has the 55th longest season of 64 LA counties, at 271 days against 358 in Orleans Parish and 247 in Claiborne Parish. Its mean temperature is 64.7°F.
- Bossier Parish: February 28 to November 29 (274 days, 19 WNV)
- Union Parish: March 2 to November 29 (272 days, 0 WNV)
- LaSalle Parish: March 1 to November 25 (269 days, 1 WNV)
- Morehouse Parish: March 2 to November 26 (269 days, 6 WNV)
West Nile in Webster Parish
From 1999 to 2025, CDC ArboNET counted 24 human West Nile cases in Webster Parish (15 neuroinvasive) across 12 years. The worst was 2012 with 9; the latest was 2025.
Background: reading the West Nile counts; how the dates are worked out.