Mosquito season in St. Charles Parish, LA: when it starts and ends
Mosquito months in St. Charles Parish
In a normal year mosquito season in St. Charles Parish, LA starts around January 20 and ends around January 7, about 50 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in St. Charles Parish, and when
- Start tipping out standing water weekly by January 6.
- Book any yard treatment for mid January, ahead of the August peak.
- Repellent can go away after January 7.
- 2 West Nile cases since 2016 (last 2025): you should use repellent at dusk April to October, more so if over 60.
St. Charles Parish against the rest of LA
St. Charles Parish has the 3rd longest season of 64 LA counties, at 352 days against 358 in Orleans Parish and 247 in Claiborne Parish. Its mean temperature is 70.5°F.
- Orleans Parish: January 18 to January 11 (358 days, 8 WNV)
- Plaquemines Parish: January 17 to January 9 (357 days, 0 WNV)
- Iberia Parish: January 21 to January 6 (350 days, 5 WNV)
- St. Mary Parish: January 21 to January 6 (350 days, 0 WNV)
West Nile in St. Charles Parish
From 1999 to 2025, CDC ArboNET counted 6 human West Nile cases in St. Charles Parish (3 neuroinvasive) across 6 years. The worst was 2025 with 1; the latest was 2025.
More: how the dates are worked out · where mosquitoes never stop.