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

Mosquito months in Caldwell County

In a normal year mosquito season in Caldwell County, TX starts around February 17 and ends around December 6, about 42 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 Caldwell County, and when

• Start tipping out standing water weekly by February 3.
• Book any yard treatment for mid February, ahead of the August peak.
• Repellent can go away after December 6.
• 1 West Nile case since 2016 (last 2024): you should use repellent at dusk May to October, more so if over 60.

Caldwell County against the rest of TX

Caldwell County has the 68th longest season of 254 TX counties, at 292 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 68.8°F.

• Dallas County: February 18 to December 12 (297 days, 219 WNV)
• Kinney County: February 16 to December 6 (293 days, 0 WNV)
• San Jacinto County: February 17 to December 4 (290 days, 0 WNV)
• Dimmit County: February 20 to December 5 (288 days, 1 WNV)

West Nile in Caldwell County

From 1999 to 2025, CDC ArboNET counted 3 human West Nile cases in Caldwell County (3 neuroinvasive) across 3 years. The worst was 2024 with 1; the latest was 2024.

See how the dates are worked out, and when mosquitoes go away for the winter.