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

Mosquito months in Deaf Smith County

In a normal year mosquito season in Deaf Smith County, TX starts around April 5 and ends around November 4, about 30 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 Deaf Smith County, and when

• Start tipping out standing water weekly by March 22.
• Book any yard treatment for early April, ahead of the July peak.
• Repellent can go away after November 4.
• 5 West Nile cases since 2016 (last 2025): you should use repellent at dusk June to August, more so if over 60.

Deaf Smith County against the rest of TX

Deaf Smith County has the 240th longest season of 254 TX counties, at 213 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 57.1°F.

• Donley County: April 3 to November 3 (214 days, 1 WNV)
• Randall County: April 3 to November 3 (214 days, 31 WNV)
• Hemphill County: April 5 to November 3 (212 days, 2 WNV)
• Roberts County: April 5 to November 3 (212 days, 1 WNV)

West Nile in Deaf Smith County

From 1999 to 2025, CDC ArboNET counted 30 human West Nile cases in Deaf Smith County (16 neuroinvasive) across 11 years. The worst was 2003 with 12; the latest was 2025.

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