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

Mosquito months in Houston County

In a normal year mosquito season in Houston County, TX starts around February 24 and ends around November 30, 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 Houston County, and when

• Start tipping out standing water weekly by February 10.
• Book any yard treatment for late February, ahead of the August peak.
• Repellent can go away after November 30.
• No West Nile cases since 2016, so bites in Houston County are a nuisance; check window screens.

Houston County against the rest of TX

Houston County has the 87th longest season of 254 TX counties, at 279 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 66.2°F.

• Morris County: February 24 to December 1 (280 days, 0 WNV)
• Bastrop County: February 26 to December 3 (280 days, 5 WNV)
• Limestone County: February 28 to December 4 (279 days, 4 WNV)
• Rockwall County: February 26 to December 1 (278 days, 5 WNV)

West Nile in Houston County

From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Houston County (1 neuroinvasive) across 1 year. The worst was 2004 with 1; the latest was 2004.

More: how the dates are worked out · when mosquitoes go away for the winter.