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

Mosquito months in Franklin County

In a normal year mosquito season in Franklin County, TX starts around March 2 and ends around December 1, about 39 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 Franklin County, and when

• Start tipping out standing water weekly by February 16.
• Book any yard treatment for early March, ahead of the July peak.
• Repellent can go away after December 1.
• 3 West Nile cases since 2016 (last 2023): you should use repellent at dusk May to September, more so if over 60.

Franklin County against the rest of TX

Franklin County has the 100th longest season of 254 TX counties, at 274 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 64.6°F.

• Denton County: March 1 to December 1 (275 days, 81 WNV)
• Lamar County: March 1 to December 1 (275 days, 3 WNV)
• Gregg County: February 28 to November 28 (273 days, 8 WNV)
• Shelby County: February 28 to November 28 (273 days, 1 WNV)

West Nile in Franklin County

From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Franklin County (3 neuroinvasive) across 4 years. The worst was 2023 with 1; the latest was 2023.

See how the dates are worked out, and when the season starts across the US.