Mosquito season in Galveston County, TX: when it starts and ends
Mosquito months in Galveston County
In a normal year mosquito season in Galveston County, TX starts around January 9 and ends around January 8, about 52 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Galveston County, and when
- Start tipping out standing water weekly by December 26.
- Book any yard treatment for early January, ahead of the August peak.
- Repellent can go away after January 8.
- 15 West Nile cases since 2016: you should wear EPA-registered repellent at dusk April to October, and check TX spray notices.
Galveston County against the rest of TX
Galveston County has the 2nd longest season of 254 TX counties, at 364 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 72.1°F.
- Cameron County: all year (365 days, 10 WNV)
- Hidalgo County: January 3 to January 1 (363 days, 25 WNV)
- Willacy County: January 7 to January 5 (363 days, 0 WNV)
West Nile in Galveston County
From 1999 to 2025, CDC ArboNET counted 28 human West Nile cases in Galveston County (24 neuroinvasive) across 14 years. The worst was 2016 with 6; the latest was 2024.
Background: where mosquitoes never stop; how the dates are worked out.