Mosquito season in Delta County, TX: when it starts and ends
Mosquito months in Delta County
In a normal year mosquito season in Delta County, TX starts around March 6 and ends around November 26, about 38 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Delta County, and when
- Start tipping out standing water weekly by February 20.
- Book any yard treatment for early March, ahead of the July peak.
- Repellent can go away after November 26.
- No West Nile cases since 2016, so bites in Delta County are a nuisance; check window screens.
Delta County against the rest of TX
Delta County has the 130th longest season of 254 TX counties, at 265 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 64.7°F.
- San Saba County: March 4 to November 24 (265 days, 0 WNV)
- Cass County: March 5 to November 25 (265 days, 2 WNV)
- Lampasas County: March 6 to November 26 (265 days, 0 WNV)
- Leon County: March 6 to November 26 (265 days, 0 WNV)
West Nile in Delta County
CDC ArboNET lists no human West Nile cases for Delta County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 3 of those years.
More: how the dates are worked out · when mosquitoes go away for the winter.