Mosquito season in Clay County, TX: when it starts and ends
Mosquito months in Clay County
In a normal year mosquito season in Clay County, TX starts around March 20 and ends around November 18, about 35 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Clay County, and when
- Start tipping out standing water weekly by March 6.
- Book any yard treatment for mid March, ahead of the July peak.
- Repellent can go away after November 18.
- 2 West Nile cases since 2016 (last 2025): you should use repellent at dusk May to September, more so if over 60.
Clay County against the rest of TX
Clay County has the 202nd longest season of 254 TX counties, at 243 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 63°F.
- Gaines County: March 17 to November 16 (244 days, 1 WNV)
- Jones County: March 17 to November 16 (244 days, 2 WNV)
- Mitchell County: March 18 to November 14 (241 days, 0 WNV)
- Real County: March 17 to November 12 (240 days, 0 WNV)
West Nile in Clay County
From 1999 to 2025, CDC ArboNET counted 7 human West Nile cases in Clay County (6 neuroinvasive) across 7 years. The worst was 2025 with 1; the latest was 2025.
More: how the dates are worked out · when the season starts across the US.