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

Mosquito months in Hartley County

In a normal year mosquito season in Hartley County, TX starts around April 11 and ends around October 31, about 29 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 Hartley County, and when

• Start tipping out standing water weekly by March 28.
• Book any yard treatment for mid April, ahead of the July peak.
• Repellent can go away after October 31.
• 1 West Nile case since 2016 (last 2023): you should use repellent at dusk June to August, more so if over 60.

Hartley County against the rest of TX

Hartley County has the 251st longest season of 254 TX counties, at 203 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 55.5°F.

• Parmer County: April 11 to November 2 (205 days, 4 WNV)
• Sherman County: April 10 to October 30 (203 days, 0 WNV)
• Bailey County: April 12 to October 30 (201 days, 2 WNV)
• Dallam County: April 18 to October 28 (193 days, 2 WNV)

West Nile in Hartley County

From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Hartley County (1 neuroinvasive) across 2 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.