Mosquito season in Brazos County, TX: when it starts and ends
Mosquito months in Brazos County
In a normal year mosquito season in Brazos County, TX starts around February 7 and ends around December 18, about 45 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Brazos County, and when
- Start tipping out standing water weekly by January 24.
- Book any yard treatment for early February, ahead of the August peak.
- Repellent can go away after December 18.
- 8 West Nile cases since 2016 (last 2025): you should use repellent at dusk May to October, more so if over 60.
Brazos County against the rest of TX
Brazos County has the 47th longest season of 254 TX counties, at 314 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 69.2°F.
- Maverick County: January 31 to December 14 (317 days, 0 WNV)
- Hardin County: February 5 to December 16 (314 days, 0 WNV)
- Refugio County: February 7 to December 18 (314 days, 0 WNV)
- Bexar County: February 5 to December 15 (313 days, 30 WNV)
West Nile in Brazos County
From 1999 to 2025, CDC ArboNET counted 54 human West Nile cases in Brazos County (32 neuroinvasive) across 13 years. The worst was 2006 with 14; the latest was 2025.
See how the dates are worked out, and reading the West Nile counts.