Mosquito season in Shelby County, TX: when it starts and ends
Mosquito months in Shelby County
In a normal year mosquito season in Shelby 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 Shelby 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.
- 1 West Nile case since 2016 (last 2016): you should use repellent at dusk May to September, more so if over 60.
Shelby County against the rest of TX
Shelby County has the 102nd longest season of 254 TX counties, at 273 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 65.6°F.
- Franklin County: March 2 to December 1 (274 days, 3 WNV)
- Gregg County: February 28 to November 28 (273 days, 8 WNV)
- Rusk County: March 1 to November 29 (273 days, 3 WNV)
- Hamilton County: March 2 to November 30 (273 days, 1 WNV)
West Nile in Shelby County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Shelby County (1 neuroinvasive) across 2 years. The worst was 2016 with 1; the latest was 2016.
More: how the dates are worked out · when the season starts across the US.