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

Mosquito months in Cameron County

Mosquitoes in Cameron County, TX can be active in any month. The worst stretch is April to October.

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 Cameron County, and when

• No off-season here: tip out standing water every week, all year.
• A yard treatment matters most April to October.
• 10 West Nile cases since 2016: you should wear EPA-registered repellent at dusk April to October, and check TX spray notices.

Cameron County against the rest of TX

Cameron County has the 1st longest season of 254 TX counties, at 365 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 74.8°F.

• Galveston County: January 9 to January 8 (364 days, 15 WNV)
• Hidalgo County: January 3 to January 1 (363 days, 25 WNV)

West Nile in Cameron County

From 1999 to 2025, CDC ArboNET counted 39 human West Nile cases in Cameron County (24 neuroinvasive) across 10 years. The worst was 2003 with 18; the latest was 2024.

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