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

Mosquito months in Polk County

In a normal year mosquito season in Polk County, TX starts around February 14 and ends around December 12, about 43 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 Polk County, and when

• Start tipping out standing water weekly by January 31.
• Book any yard treatment for mid February, ahead of the July peak.
• Repellent can go away after December 12.
• 3 West Nile cases since 2016 (last 2024): you should use repellent at dusk May to September, more so if over 60.

Polk County against the rest of TX

Polk County has the 62nd longest season of 254 TX counties, at 301 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 68.4°F.

• Atascosa County: February 10 to December 10 (303 days, 0 WNV)
• Terrell County: February 11 to December 9 (301 days, 0 WNV)
• Medina County: February 12 to December 9 (300 days, 1 WNV)
• Fayette County: February 15 to December 10 (298 days, 0 WNV)

West Nile in Polk County

From 1999 to 2025, CDC ArboNET counted 7 human West Nile cases in Polk County (6 neuroinvasive) across 6 years. The worst was 2016 with 2; the latest was 2024.

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