Mosquito season in San Augustine County, TX: when it starts and ends

Mosquito months in San Augustine County

In a normal year mosquito season in San Augustine County, TX starts around March 4 and ends around November 25, about 38 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in San Augustine County, and when

• Start tipping out standing water weekly by February 18.
• Book any yard treatment for early March, ahead of the August peak.
• Repellent can go away after November 25.
• 3 West Nile cases since 2016 (last 2024): you should use repellent at dusk May to September, more so if over 60.

San Augustine County against the rest of TX

San Augustine County has the 126th longest season of 254 TX counties, at 266 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 65.9°F.

• Reagan County: March 4 to November 25 (266 days, 0 WNV)
• Sabine County: March 4 to November 25 (266 days, 0 WNV)
• Fannin County: March 4 to November 24 (265 days, 0 WNV)
• San Saba County: March 4 to November 24 (265 days, 0 WNV)

West Nile in San Augustine County

From 1999 to 2025, CDC ArboNET counted 3 human West Nile cases in San Augustine County (2 neuroinvasive) across 2 years. The worst was 2024 with 2; the latest was 2024.

Background: when mosquitoes go away for the winter; how the dates are worked out.