Mosquito season in Willacy County, TX: when it starts and ends
Mosquito months in Willacy County
In a normal year mosquito season in Willacy County, TX starts around January 7 and ends around January 5, about 52 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Willacy County, and when
- Start tipping out standing water weekly by December 24.
- Book any yard treatment for early January, ahead of the August peak.
- Repellent can go away after January 5.
- No West Nile cases since 2016, so bites in Willacy County are a nuisance; check window screens.
Willacy County against the rest of TX
Willacy County has the 4th longest season of 254 TX counties, at 363 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 74.1°F.
- Galveston County: January 9 to January 8 (364 days, 15 WNV)
- Hidalgo County: January 3 to January 1 (363 days, 25 WNV)
- Zapata County: January 5 to January 1 (361 days, 0 WNV)
- Aransas County: January 8 to January 4 (361 days, 0 WNV)
West Nile in Willacy County
From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in Willacy County (3 neuroinvasive) across 4 years. The worst was 2003 with 2; the latest was 2015.
More: how the dates are worked out · where mosquitoes never stop.