Mosquito season in Blanco County, TX: when it starts and ends
Mosquito months in Blanco County
In a normal year mosquito season in Blanco County, TX starts around March 6 and ends around November 22, about 37 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Blanco County, and when
- Start tipping out standing water weekly by February 20.
- Book any yard treatment for early March, ahead of the August peak.
- Repellent can go away after November 22.
- 1 West Nile case since 2016 (last 2020): you should use repellent at dusk May to September, more so if over 60.
Blanco County against the rest of TX
Blanco County has the 146th longest season of 254 TX counties, at 261 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 66.9°F.
- Reeves County: March 4 to November 20 (261 days, 1 WNV)
- Llano County: March 5 to November 21 (261 days, 0 WNV)
- Tom Green County: March 6 to November 22 (261 days, 5 WNV)
- Coryell County: March 5 to November 20 (260 days, 0 WNV)
West Nile in Blanco County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Blanco County (2 neuroinvasive) across 2 years. The worst was 2020 with 1; the latest was 2020.
More: how the dates are worked out · when the season starts across the US.