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

Mosquito months in Smith County

In a normal year mosquito season in Smith County, TX starts around February 23 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 Smith County, and when

• Start tipping out standing water weekly by February 9.
• Book any yard treatment for late February, ahead of the August peak.
• Repellent can go away after December 4.
• 19 West Nile cases since 2016: you should wear EPA-registered repellent at dusk May to September, and check TX spray notices.

Smith County against the rest of TX

Smith County has the 80th longest season of 254 TX counties, at 284 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 66.4°F.

• Edwards County: February 24 to December 6 (285 days, 0 WNV)
• Brewster County: February 21 to December 2 (284 days, 0 WNV)
• Pecos County: February 23 to December 1 (281 days, 1 WNV)
• Panola County: February 24 to December 2 (281 days, 1 WNV)

West Nile in Smith County

From 1999 to 2025, CDC ArboNET counted 61 human West Nile cases in Smith County (43 neuroinvasive) across 12 years. The worst was 2012 with 22; the latest was 2025.

See how the dates are worked out, and reading the West Nile counts.