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

Mosquito months in Bell County

In a normal year mosquito season in Bell County, TX starts around March 1 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 Bell County, and when

• Start tipping out standing water weekly by February 15.
• Book any yard treatment for early March, ahead of the August peak.
• Repellent can go away after December 1.
• 12 West Nile cases since 2016: you should wear EPA-registered repellent at dusk May to September, and check TX spray notices.

Bell County against the rest of TX

Bell County has the 96th longest season of 254 TX counties, at 275 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 66.6°F.

• Nacogdoches County: February 28 to December 1 (276 days, 3 WNV)
• Comanche County: March 1 to December 2 (276 days, 2 WNV)
• Coleman County: March 1 to December 1 (275 days, 0 WNV)
• Denton County: March 1 to December 1 (275 days, 81 WNV)

West Nile in Bell County

From 1999 to 2025, CDC ArboNET counted 25 human West Nile cases in Bell County (20 neuroinvasive) across 7 years. The worst was 2012 with 10; the latest was 2024.

More: how the dates are worked out · reading the West Nile counts.