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

Mosquito months in Walker County

In a normal year mosquito season in Walker County, TX starts around February 8 and ends around December 16, about 44 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 Walker County, and when

• Start tipping out standing water weekly by January 25.
• Book any yard treatment for early February, ahead of the August peak.
• Repellent can go away after December 16.
• 4 West Nile cases since 2016 (last 2025): you should use repellent at dusk May to September, more so if over 60.

Walker County against the rest of TX

Walker County has the 54th longest season of 254 TX counties, at 311 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 68.6°F.

• Travis County: February 27 to January 6 (313 days, 56 WNV)
• Orange County: February 3 to December 12 (312 days, 4 WNV)
• Washington County: February 10 to December 18 (311 days, 0 WNV)
• Burleson County: March 5 to January 10 (311 days, 1 WNV)

West Nile in Walker County

From 1999 to 2025, CDC ArboNET counted 15 human West Nile cases in Walker County (11 neuroinvasive) across 12 years. The worst was 2024 with 2; the latest was 2025.

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