Mosquito season in Parmer County, TX: when it starts and ends
Mosquito months in Parmer County
In a normal year mosquito season in Parmer County, TX starts around April 11 and ends around November 2, about 29 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Parmer County, and when
- Start tipping out standing water weekly by March 28.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after November 2.
- 4 West Nile cases since 2016 (last 2023): you should use repellent at dusk June to August, more so if over 60.
Parmer County against the rest of TX
Parmer County has the 249th longest season of 254 TX counties, at 205 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 57°F.
- Castro County: April 10 to November 1 (205 days, 3 WNV)
- Hansford County: April 10 to November 1 (205 days, 4 WNV)
- Sherman County: April 10 to October 30 (203 days, 0 WNV)
- Hartley County: April 11 to October 31 (203 days, 1 WNV)
West Nile in Parmer County
From 1999 to 2025, CDC ArboNET counted 23 human West Nile cases in Parmer County (9 neuroinvasive) across 7 years. The worst was 2003 with 14; the latest was 2023.
More: how the dates are worked out · reading the West Nile counts.