Mosquito season in Leon County, TX: when it starts and ends
Mosquito months in Leon County
In a normal year mosquito season in Leon County, TX starts around March 6 and ends around November 26, about 38 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Leon 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 26.
- No West Nile cases since 2016, so bites in Leon County are a nuisance; check window screens.
Leon County against the rest of TX
Leon County has the 132nd longest season of 254 TX counties, at 265 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 65.7°F.
- Delta County: March 6 to November 26 (265 days, 0 WNV)
- Lampasas County: March 6 to November 26 (265 days, 0 WNV)
- Rains County: March 6 to November 26 (265 days, 1 WNV)
- Marion County: March 3 to November 22 (264 days, 0 WNV)
West Nile in Leon County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Leon County (1 neuroinvasive) across 2 years. The worst was 2014 with 1; the latest was 2014.
More: how the dates are worked out · when mosquitoes go away for the winter.