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

Mosquito months in Oldham County

In a normal year mosquito season in Oldham County, TX starts around April 7 and ends around November 3, 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 Oldham County, and when

• Start tipping out standing water weekly by March 24.
• Book any yard treatment for early April, ahead of the July peak.
• Repellent can go away after November 3.
• No West Nile cases since 2016, so bites in Oldham County are a nuisance; check window screens.

Oldham County against the rest of TX

Oldham County has the 243rd longest season of 254 TX counties, at 210 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 56.9°F.

• Hemphill County: April 5 to November 3 (212 days, 2 WNV)
• Roberts County: April 5 to November 3 (212 days, 1 WNV)
• Swisher County: April 7 to November 3 (210 days, 2 WNV)
• Armstrong County: April 8 to October 31 (206 days, 1 WNV)

West Nile in Oldham County

From 1999 to 2025, CDC ArboNET counted 6 human West Nile cases in Oldham County (3 neuroinvasive) across 5 years. The worst was 2004 with 2; the latest was 2015.

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