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

Mosquito months in Bastrop County

In a normal year mosquito season in Bastrop County, TX starts around February 26 and ends around December 3, about 40 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 Bastrop County, and when

• Start tipping out standing water weekly by February 12.
• Book any yard treatment for late February, ahead of the August peak.
• Repellent can go away after December 3.
• 5 West Nile cases since 2016 (last 2016): you should use repellent at dusk May to September, more so if over 60.

Bastrop County against the rest of TX

Bastrop County has the 86th longest season of 254 TX counties, at 280 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 68.1°F.

• McLennan County: February 25 to December 3 (281 days, 17 WNV)
• Morris County: February 24 to December 1 (280 days, 0 WNV)
• Houston County: February 24 to November 30 (279 days, 0 WNV)
• Limestone County: February 28 to December 4 (279 days, 4 WNV)

West Nile in Bastrop County

From 1999 to 2025, CDC ArboNET counted 13 human West Nile cases in Bastrop County (6 neuroinvasive) across 4 years. The worst was 2012 with 6; the latest was 2016.

See how the dates are worked out, and reading the West Nile counts.