Mosquito season in LaSalle Parish, LA: when it starts and ends
Mosquito months in LaSalle Parish
In a normal year mosquito season in LaSalle Parish, LA starts around March 1 and ends around November 25, about 38 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in LaSalle 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 25.
- 1 West Nile case since 2016 (last 2017): you should use repellent at dusk May to September, more so if over 60.
LaSalle Parish against the rest of LA
LaSalle Parish has the 56th longest season of 64 LA counties, at 269 days against 358 in Orleans Parish and 247 in Claiborne Parish. Its mean temperature is 65°F.
- Union Parish: March 2 to November 29 (272 days, 0 WNV)
- Webster Parish: March 1 to November 27 (271 days, 9 WNV)
- Morehouse Parish: March 2 to November 26 (269 days, 6 WNV)
- Tensas Parish: February 27 to November 22 (268 days, 0 WNV)
West Nile in LaSalle Parish
From 1999 to 2025, CDC ArboNET counted 3 human West Nile cases in LaSalle Parish (1 neuroinvasive) across 2 years. The worst was 2012 with 2; the latest was 2017.
See how the dates are worked out, and when mosquitoes go away for the winter.