Mosquito season in Dallam County, TX: when it starts and ends
Mosquito months in Dallam County
In a normal year mosquito season in Dallam County, TX starts around April 18 and ends around October 28, about 28 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Dallam County, and when
- Start tipping out standing water weekly by April 4.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 28.
- 2 West Nile cases since 2016 (last 2025): you should use repellent at dusk June to August, more so if over 60.
Dallam County against the rest of TX
Dallam County has the 253rd longest season of 254 TX counties, at 193 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 55.8°F.
- Hartley County: April 11 to October 31 (203 days, 1 WNV)
- Bailey County: April 12 to October 30 (201 days, 2 WNV)
- Lipscomb County: April 16 to October 24 (191 days, 2 WNV)
West Nile in Dallam County
From 1999 to 2025, CDC ArboNET counted 8 human West Nile cases in Dallam County (4 neuroinvasive) across 6 years. The worst was 2013 with 2; the latest was 2025.
Background: when the season starts across the US; how the dates are worked out.