Mosquito season in Llano County, TX: when it starts and ends
Mosquito months in Llano County
In a normal year mosquito season in Llano County, TX starts around March 5 and ends around November 21, about 37 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Llano County, and when
- Start tipping out standing water weekly by February 19.
- Book any yard treatment for early March, ahead of the August peak.
- Repellent can go away after November 21.
- No West Nile cases since 2016, so bites in Llano County are a nuisance; check window screens.
Llano County against the rest of TX
Llano County has the 145th longest season of 254 TX counties, at 261 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 67.1°F.
- Wise County: March 6 to November 23 (262 days, 3 WNV)
- Reeves County: March 4 to November 20 (261 days, 1 WNV)
- Blanco County: March 6 to November 22 (261 days, 1 WNV)
- Tom Green County: March 6 to November 22 (261 days, 5 WNV)
West Nile in Llano County
CDC ArboNET lists no human West Nile cases for Llano County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 3 of those years.
Background: when mosquitoes go away for the winter; how the dates are worked out.