Mosquito season in Washington County, TX: when it starts and ends
Mosquito months in Washington County
In a normal year mosquito season in Washington County, TX starts around February 10 and ends around December 18, about 44 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Washington County, and when
- Start tipping out standing water weekly by January 27.
- Book any yard treatment for early February, ahead of the August peak.
- Repellent can go away after December 18.
- No West Nile cases since 2016, so bites in Washington County are a nuisance; check window screens.
Washington County against the rest of TX
Washington County has the 55th longest season of 254 TX counties, at 311 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 67.9°F.
- Orange County: February 3 to December 12 (312 days, 4 WNV)
- Walker County: February 8 to December 16 (311 days, 4 WNV)
- Burleson County: March 5 to January 10 (311 days, 1 WNV)
- Gonzales County: February 6 to December 12 (309 days, 1 WNV)
West Nile in Washington County
From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Washington County (3 neuroinvasive) across 4 years. The worst was 2012 with 1; the latest was 2012.
More: how the dates are worked out · when mosquitoes go away for the winter.