Mosquito season in Karnes County, TX: when it starts and ends
Mosquito months in Karnes County
In a normal year mosquito season in Karnes County, TX starts around January 28 and ends around December 27, about 48 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Karnes County, and when
- Start tipping out standing water weekly by January 14.
- Book any yard treatment for late January, ahead of the August peak.
- Repellent can go away after December 27.
- 1 West Nile case since 2016 (last 2017): you should use repellent at dusk April to October, more so if over 60.
Karnes County against the rest of TX
Karnes County has the 28th longest season of 254 TX counties, at 333 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 70.2°F.
- Live Oak County: January 23 to December 25 (336 days, 0 WNV)
- La Salle County: January 20 to December 19 (333 days, 0 WNV)
- Bee County: January 29 to December 27 (332 days, 1 WNV)
- Frio County: January 26 to December 23 (331 days, 0 WNV)
West Nile in Karnes County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Karnes County (1 neuroinvasive) across 1 year. The worst was 2017 with 1; the latest was 2017.
See how the dates are worked out, and where mosquitoes never stop.