Mosquito season in Rockwall County, TX: when it starts and ends
Mosquito months in Rockwall County
In a normal year mosquito season in Rockwall County, TX starts around February 26 and ends around December 1, about 40 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Rockwall County, and when
- Start tipping out standing water weekly by February 12.
- Book any yard treatment for late February, ahead of the August peak.
- Repellent can go away after December 1.
- 5 West Nile cases since 2016 (last 2025): you should use repellent at dusk May to September, more so if over 60.
Rockwall County against the rest of TX
Rockwall County has the 89th longest season of 254 TX counties, at 278 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 65°F.
- Houston County: February 24 to November 30 (279 days, 0 WNV)
- Limestone County: February 28 to December 4 (279 days, 4 WNV)
- Tarrant County: February 26 to December 1 (278 days, 236 WNV)
- Van Zandt County: February 28 to December 3 (278 days, 9 WNV)
West Nile in Rockwall County
From 1999 to 2025, CDC ArboNET counted 8 human West Nile cases in Rockwall County (5 neuroinvasive) across 4 years. The worst was 2025 with 3; the latest was 2025.
Background: reading the West Nile counts; how the dates are worked out.