Mosquito season in Dimmit County, TX: when it starts and ends
Mosquito months in Dimmit County
In a normal year mosquito season in Dimmit County, TX starts around February 20 and ends around December 5, about 41 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Dimmit County, and when
- Start tipping out standing water weekly by February 6.
- Book any yard treatment for mid February, ahead of the August peak.
- Repellent can go away after December 5.
- 1 West Nile case since 2016 (last 2016): you should use repellent at dusk April to October, more so if over 60.
Dimmit County against the rest of TX
Dimmit County has the 70th longest season of 254 TX counties, at 288 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 71.1°F.
- Caldwell County: February 17 to December 6 (292 days, 1 WNV)
- San Jacinto County: February 17 to December 4 (290 days, 0 WNV)
- Navarro County: February 22 to December 7 (288 days, 10 WNV)
- El Paso County: February 16 to November 30 (287 days, 89 WNV)
West Nile in Dimmit County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Dimmit County (1 neuroinvasive) across 1 year. The worst was 2016 with 1; the latest was 2016.
Background: when mosquitoes go away for the winter; how the dates are worked out.