Mosquito season in Trinity County, TX: when it starts and ends
Mosquito months in Trinity County
In a normal year mosquito season in Trinity County, TX starts around February 6 and ends around January 12, about 49 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Trinity County, and when
- Start tipping out standing water weekly by January 23.
- Book any yard treatment for early February, ahead of the August peak.
- Repellent can go away after January 12.
- 2 West Nile cases since 2016 (last 2018): you should use repellent at dusk May to September, more so if over 60.
Trinity County against the rest of TX
Trinity County has the 21st longest season of 254 TX counties, at 340 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 67.9°F.
- Chambers County: January 25 to December 31 (340 days, 2 WNV)
- Harris County: January 27 to January 2 (340 days, 188 WNV)
- Jefferson County: January 28 to January 1 (338 days, 8 WNV)
- Fort Bend County: January 26 to December 29 (337 days, 15 WNV)
West Nile in Trinity County
From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Trinity County (3 neuroinvasive) across 4 years. The worst was 2018 with 1; the latest was 2018.
More: how the dates are worked out · where mosquitoes never stop.