Mosquito season in Brown County, TX: when it starts and ends
Mosquito months in Brown County
In a normal year mosquito season in Brown County, TX starts around March 7 and ends around November 21, about 37 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Brown County, and when
- Start tipping out standing water weekly by February 21.
- Book any yard treatment for early March, ahead of the July peak.
- Repellent can go away after November 21.
- 2 West Nile cases since 2016 (last 2016): you should use repellent at dusk May to September, more so if over 60.
Brown County against the rest of TX
Brown County has the 149th longest season of 254 TX counties, at 259 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 65.6°F.
- Tom Green County: March 6 to November 22 (261 days, 5 WNV)
- Coryell County: March 5 to November 20 (260 days, 0 WNV)
- Ector County: March 7 to November 21 (259 days, 7 WNV)
- Runnels County: March 8 to November 22 (259 days, 3 WNV)
West Nile in Brown County
From 1999 to 2025, CDC ArboNET counted 6 human West Nile cases in Brown County (3 neuroinvasive) across 4 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.