Mosquito season in Gregg County, TX: when it starts and ends
Mosquito months in Gregg County
In a normal year mosquito season in Gregg County, TX starts around February 28 and ends around November 28, about 39 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Gregg County, and when
- Start tipping out standing water weekly by February 14.
- Book any yard treatment for late February, ahead of the July peak.
- Repellent can go away after November 28.
- 8 West Nile cases since 2016 (last 2025): you should use repellent at dusk May to September, more so if over 60.
Gregg County against the rest of TX
Gregg County has the 101st longest season of 254 TX counties, at 273 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 65.7°F.
- Lamar County: March 1 to December 1 (275 days, 3 WNV)
- Franklin County: March 2 to December 1 (274 days, 3 WNV)
- Shelby County: February 28 to November 28 (273 days, 1 WNV)
- Rusk County: March 1 to November 29 (273 days, 3 WNV)
West Nile in Gregg County
From 1999 to 2025, CDC ArboNET counted 57 human West Nile cases in Gregg County (36 neuroinvasive) across 9 years. The worst was 2012 with 30; the latest was 2025.
See how the dates are worked out, and reading the West Nile counts.