Mosquito season in Dawson County, TX: when it starts and ends
Mosquito months in Dawson County
In a normal year mosquito season in Dawson County, TX starts around March 19 and ends around November 13, about 34 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Dawson County, and when
- Start tipping out standing water weekly by March 5.
- Book any yard treatment for mid March, ahead of the July peak.
- Repellent can go away after November 13.
- 3 West Nile cases since 2016 (last 2025): you should use repellent at dusk June to September, more so if over 60.
Dawson County against the rest of TX
Dawson County has the 205th longest season of 254 TX counties, at 239 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 60.9°F.
- Mitchell County: March 18 to November 14 (241 days, 0 WNV)
- Real County: March 17 to November 12 (240 days, 0 WNV)
- Taylor County: March 20 to November 14 (239 days, 4 WNV)
- Terry County: March 20 to November 14 (239 days, 1 WNV)
West Nile in Dawson County
From 1999 to 2025, CDC ArboNET counted 10 human West Nile cases in Dawson County (9 neuroinvasive) across 8 years. The worst was 2012 with 2; the latest was 2025.
Background: when mosquitoes go away for the winter; how the dates are worked out.