Mosquito season in Tarrant County, TX: when it starts and ends
Mosquito months in Tarrant County
In a normal year mosquito season in Tarrant County, TX starts around February 26 and ends around December 1, about 40 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Tarrant County, and when
- Start tipping out standing water weekly by February 12.
- Book any yard treatment for late February, ahead of the July peak.
- Repellent can go away after December 1.
- 236 West Nile cases since 2016: you should wear EPA-registered repellent at dusk May to September, and check TX spray notices.
Tarrant County against the rest of TX
Tarrant County has the 90th longest season of 254 TX counties, at 278 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 66.1°F.
- Limestone County: February 28 to December 4 (279 days, 4 WNV)
- Rockwall County: February 26 to December 1 (278 days, 5 WNV)
- Van Zandt County: February 28 to December 3 (278 days, 9 WNV)
- Val Verde County: February 25 to November 29 (277 days, 1 WNV)
West Nile in Tarrant County
From 1999 to 2025, CDC ArboNET counted 716 human West Nile cases in Tarrant County (405 neuroinvasive) across 23 years. The worst was 2012 with 259; the latest was 2025.
More: how the dates are worked out · reading the West Nile counts.