Mosquito season in Cass County, TX: when it starts and ends
Mosquito months in Cass County
In a normal year mosquito season in Cass County, TX starts around March 5 and ends around November 25, about 38 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Cass County, and when
- Start tipping out standing water weekly by February 19.
- Book any yard treatment for early March, ahead of the July peak.
- Repellent can go away after November 25.
- 2 West Nile cases since 2016 (last 2016): you should use repellent at dusk May to September, more so if over 60.
Cass County against the rest of TX
Cass County has the 129th longest season of 254 TX counties, at 265 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 64.4°F.
- Fannin County: March 4 to November 24 (265 days, 0 WNV)
- San Saba County: March 4 to November 24 (265 days, 0 WNV)
- Delta County: March 6 to November 26 (265 days, 0 WNV)
- Lampasas County: March 6 to November 26 (265 days, 0 WNV)
West Nile in Cass County
From 1999 to 2025, CDC ArboNET counted 6 human West Nile cases in Cass County (2 neuroinvasive) across 3 years. The worst was 2016 with 2; the latest was 2016.
See how the dates are worked out, and when mosquitoes go away for the winter.