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

Mosquito months in San Patricio County

In a normal year mosquito season in San Patricio County, TX starts around January 12 and ends around January 1, about 51 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 San Patricio County, and when

• Start tipping out standing water weekly by December 29.
• Book any yard treatment for mid January, ahead of the August peak.
• Repellent can go away after January 1.
• 2 West Nile cases since 2016 (last 2017): you should use repellent at dusk April to October, more so if over 60.

San Patricio County against the rest of TX

San Patricio County has the 9th longest season of 254 TX counties, at 354 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 71.5°F.

• Jim Wells County: January 15 to January 6 (356 days, 1 WNV)
• Nueces County: January 11 to January 1 (355 days, 14 WNV)
• Brazoria County: January 19 to January 7 (353 days, 11 WNV)
• Starr County: January 12 to December 29 (351 days, 0 WNV)

West Nile in San Patricio County

From 1999 to 2025, CDC ArboNET counted 10 human West Nile cases in San Patricio County (7 neuroinvasive) across 4 years. The worst was 2006 with 4; the latest was 2017.

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