Mosquito season in Fannin County, TX: when it starts and ends
Mosquito months in Fannin County
In a normal year mosquito season in Fannin County, TX starts around March 4 and ends around November 24, about 38 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Fannin County, and when
- Start tipping out standing water weekly by February 18.
- Book any yard treatment for early March, ahead of the July peak.
- Repellent can go away after November 24.
- No West Nile cases since 2016, so bites in Fannin County are a nuisance; check window screens.
Fannin County against the rest of TX
Fannin County has the 127th longest season of 254 TX counties, at 265 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 63.6°F.
- Sabine County: March 4 to November 25 (266 days, 0 WNV)
- San Augustine County: March 4 to November 25 (266 days, 3 WNV)
- San Saba County: March 4 to November 24 (265 days, 0 WNV)
- Cass County: March 5 to November 25 (265 days, 2 WNV)
West Nile in Fannin County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Fannin County (1 neuroinvasive) across 1 year. The worst was 2012 with 2; the latest was 2012.
Background: when mosquitoes go away for the winter; how the dates are worked out.