Mosquito season in Waller County, TX: when it starts and ends
Mosquito months in Waller County
In a normal year mosquito season in Waller County, TX starts around February 11 and ends around December 16, about 44 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Waller County, and when
- Start tipping out standing water weekly by January 28.
- Book any yard treatment for mid February, ahead of the August peak.
- Repellent can go away after December 16.
- 4 West Nile cases since 2016 (last 2025): you should use repellent at dusk May to October, more so if over 60.
Waller County against the rest of TX
Waller County has the 58th longest season of 254 TX counties, at 308 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 68.8°F.
- Burleson County: March 5 to January 10 (311 days, 1 WNV)
- Gonzales County: February 6 to December 12 (309 days, 1 WNV)
- Guadalupe County: February 4 to December 8 (307 days, 1 WNV)
- Atascosa County: February 10 to December 10 (303 days, 0 WNV)
West Nile in Waller County
From 1999 to 2025, CDC ArboNET counted 10 human West Nile cases in Waller County (9 neuroinvasive) across 9 years. The worst was 2016 with 2; the latest was 2025.
See how the dates are worked out, and reading the West Nile counts.