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

Mosquito months in Atascosa County

In a normal year mosquito season in Atascosa County, TX starts around February 10 and ends around December 10, 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 Atascosa County, and when

• Start tipping out standing water weekly by January 27.
• Book any yard treatment for early February, ahead of the August peak.
• Repellent can go away after December 10.
• No West Nile cases since 2016, so bites in Atascosa County are a nuisance; check window screens.

Atascosa County against the rest of TX

Atascosa County has the 60th longest season of 254 TX counties, at 303 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 70.6°F.

• Waller County: February 11 to December 16 (308 days, 4 WNV)
• Guadalupe County: February 4 to December 8 (307 days, 1 WNV)
• Terrell County: February 11 to December 9 (301 days, 0 WNV)
• Polk County: February 14 to December 12 (301 days, 3 WNV)

West Nile in Atascosa County

CDC ArboNET lists no human West Nile cases for Atascosa County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 4 of those years.

Background: when the season starts across the US; how the dates are worked out.