Mosquito season in Morris County, TX: when it starts and ends
Mosquito months in Morris County
In a normal year mosquito season in Morris County, TX starts around February 24 and ends around December 1, about 40 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Morris County, and when
- Start tipping out standing water weekly by February 10.
- Book any yard treatment for late February, ahead of the August peak.
- Repellent can go away after December 1.
- No West Nile cases since 2016, so bites in Morris County are a nuisance; check window screens.
Morris County against the rest of TX
Morris County has the 85th longest season of 254 TX counties, at 280 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 64.1°F.
- Colorado County: February 25 to December 3 (281 days, 2 WNV)
- McLennan County: February 25 to December 3 (281 days, 17 WNV)
- Bastrop County: February 26 to December 3 (280 days, 5 WNV)
- Houston County: February 24 to November 30 (279 days, 0 WNV)
West Nile in Morris County
CDC ArboNET lists no human West Nile cases for Morris 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.