Mosquito season in Webb County, TX: when it starts and ends
Mosquito months in Webb County
In a normal year mosquito season in Webb County, TX starts around January 31 and ends around December 27, about 47 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Webb County, and when
- Start tipping out standing water weekly by January 17.
- Book any yard treatment for late January, ahead of the August peak.
- Repellent can go away after December 27.
- 3 West Nile cases since 2016 (last 2020): you should use repellent at dusk April to October, more so if over 60.
Webb County against the rest of TX
Webb County has the 33rd longest season of 254 TX counties, at 330 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 73.5°F.
- Lavaca County: January 30 to December 27 (331 days, 0 WNV)
- McMullen County: January 21 to December 17 (330 days, 0 WNV)
- Lee County: February 17 to January 13 (330 days, 0 WNV)
- Liberty County: January 30 to December 22 (326 days, 4 WNV)
West Nile in Webb County
From 1999 to 2025, CDC ArboNET counted 10 human West Nile cases in Webb County (9 neuroinvasive) across 9 years. The worst was 2003 with 2; the latest was 2020.
More: how the dates are worked out · where mosquitoes never stop.