Mosquito season in Duval County, TX: when it starts and ends
Mosquito months in Duval County
In a normal year mosquito season in Duval County, TX starts around January 29 and ends around December 18, about 46 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Duval County, and when
- Start tipping out standing water weekly by January 15.
- Book any yard treatment for late January, ahead of the August peak.
- Repellent can go away after December 18.
- No West Nile cases since 2016, so bites in Duval County are a nuisance; check window screens.
Duval County against the rest of TX
Duval County has the 40th longest season of 254 TX counties, at 323 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 72.2°F.
- Newton County: February 19 to January 10 (325 days, 1 WNV)
- Montgomery County: February 2 to December 23 (324 days, 86 WNV)
- Brooks County: January 31 to December 20 (323 days, 0 WNV)
- Milam County: February 23 to January 12 (323 days, 1 WNV)
West Nile in Duval County
CDC ArboNET lists no human West Nile cases for Duval County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 1 of those years.
Background: when mosquitoes go away for the winter; how the dates are worked out.