Mosquito season in Richland Parish, LA: when it starts and ends
Mosquito months in Richland Parish
In a normal year mosquito season in Richland Parish, LA starts around February 9 and ends around December 11, about 44 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Richland Parish, and when
- Start tipping out standing water weekly by January 26.
- Book any yard treatment for early February, ahead of the July peak.
- Repellent can go away after December 11.
- 1 West Nile case since 2016 (last 2023): you should use repellent at dusk May to September, more so if over 60.
Richland Parish against the rest of LA
Richland Parish has the 33rd longest season of 64 LA counties, at 305 days against 358 in Orleans Parish and 247 in Claiborne Parish. Its mean temperature is 66.4°F.
- Grant Parish: February 11 to December 14 (306 days, 2 WNV)
- St. Landry Parish: February 6 to December 8 (305 days, 3 WNV)
- Iberville Parish: February 8 to December 9 (304 days, 4 WNV)
- West Baton Rouge Parish: February 8 to December 9 (304 days, 6 WNV)
West Nile in Richland Parish
From 1999 to 2025, CDC ArboNET counted 9 human West Nile cases in Richland Parish (6 neuroinvasive) across 7 years. The worst was 2012 with 2; the latest was 2023.
More: how the dates are worked out · when the season starts across the US.