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

Mosquito months in Stephens County

In a normal year mosquito season in Stephens County, TX starts around March 21 and ends around November 11, about 34 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 Stephens County, and when

• Start tipping out standing water weekly by March 7.
• Book any yard treatment for late March, ahead of the July peak.
• Repellent can go away after November 11.
• 1 West Nile case since 2016 (last 2025): you should use repellent at dusk May to September, more so if over 60.

Stephens County against the rest of TX

Stephens County has the 216th longest season of 254 TX counties, at 235 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 63.7°F.

• Glasscock County: March 21 to November 14 (238 days, 1 WNV)
• Crosby County: March 22 to November 14 (237 days, 3 WNV)
• Lubbock County: March 22 to November 11 (234 days, 52 WNV)
• Hardeman County: March 22 to November 10 (233 days, 1 WNV)

West Nile in Stephens County

From 1999 to 2025, CDC ArboNET counted 7 human West Nile cases in Stephens County (4 neuroinvasive) across 5 years. The worst was 2012 with 2; the latest was 2025.

See how the dates are worked out, and when mosquitoes go away for the winter.