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

Mosquito months in San Jacinto County

In a normal year mosquito season in San Jacinto County, TX starts around February 17 and ends around December 4, about 41 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 Jacinto 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 4.
• No West Nile cases since 2016, so bites in San Jacinto County are a nuisance; check window screens.

San Jacinto County against the rest of TX

San Jacinto County has the 69th longest season of 254 TX counties, at 290 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 67.5°F.

• Kinney County: February 16 to December 6 (293 days, 0 WNV)
• Caldwell County: February 17 to December 6 (292 days, 1 WNV)
• Dimmit County: February 20 to December 5 (288 days, 1 WNV)
• Navarro County: February 22 to December 7 (288 days, 10 WNV)

West Nile in San Jacinto County

From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in San Jacinto County (1 neuroinvasive) across 1 year. The worst was 2015 with 1; the latest was 2015.

More: how the dates are worked out · when the season starts across the US.