Mosquito season in Travis County, TX: when it starts and ends
Mosquito months in Travis County
In a normal year mosquito season in Travis County, TX starts around February 27 and ends around January 6, about 45 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Travis County, and when
- Start tipping out standing water weekly by February 13.
- Book any yard treatment for late February, ahead of the August peak.
- Repellent can go away after January 6.
- 56 West Nile cases since 2016: you should wear EPA-registered repellent at dusk May to September, and check TX spray notices.
Travis County against the rest of TX
Travis County has the 52nd longest season of 254 TX counties, at 313 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 68.1°F.
- Goliad County: February 5 to December 15 (313 days, 0 WNV)
- Austin County: February 10 to December 20 (313 days, 0 WNV)
- Orange County: February 3 to December 12 (312 days, 4 WNV)
- Walker County: February 8 to December 16 (311 days, 4 WNV)
West Nile in Travis County
From 1999 to 2025, CDC ArboNET counted 257 human West Nile cases in Travis County (126 neuroinvasive) across 17 years. The worst was 2012 with 151; the latest was 2025.
Background: reading the West Nile counts; how the dates are worked out.