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

Mosquito months in Chambers County

In a normal year mosquito season in Chambers County, TX starts around January 25 and ends around December 31, about 49 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 Chambers County, and when

• Start tipping out standing water weekly by January 11.
• Book any yard treatment for late January, ahead of the August peak.
• Repellent can go away after December 31.
• 2 West Nile cases since 2016 (last 2025): you should use repellent at dusk May to October, more so if over 60.

Chambers County against the rest of TX

Chambers County has the 19th longest season of 254 TX counties, at 340 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 68.7°F.

• Calhoun County: January 27 to January 4 (342 days, 0 WNV)
• Zavala County: January 20 to December 26 (340 days, 2 WNV)
• Harris County: January 27 to January 2 (340 days, 188 WNV)
• Trinity County: February 6 to January 12 (340 days, 2 WNV)

West Nile in Chambers County

From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in Chambers County (4 neuroinvasive) across 4 years. The worst was 2014 with 2; the latest was 2025.

See how the dates are worked out, and where mosquitoes never stop.