Mosquito season in Gillespie County, TX: when it starts and ends
Mosquito months in Gillespie County
In a normal year mosquito season in Gillespie County, TX starts around March 4 and ends around November 22, about 38 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Gillespie County, and when
- Start tipping out standing water weekly by February 18.
- Book any yard treatment for early March, ahead of the August peak.
- Repellent can go away after November 22.
- No West Nile cases since 2016, so bites in Gillespie County are a nuisance; check window screens.
Gillespie County against the rest of TX
Gillespie County has the 140th longest season of 254 TX counties, at 263 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 65.1°F.
- Johnson County: March 6 to November 25 (264 days, 17 WNV)
- Madison County: March 2 to November 20 (263 days, 0 WNV)
- Red River County: March 5 to November 23 (263 days, 2 WNV)
- Howard County: March 6 to November 24 (263 days, 1 WNV)
West Nile in Gillespie County
CDC ArboNET lists no human West Nile cases for Gillespie County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 4 of those years.
More: how the dates are worked out · when mosquitoes go away for the winter.