Mosquito season in Swisher County, TX: when it starts and ends
Mosquito months in Swisher County
In a normal year mosquito season in Swisher County, TX starts around April 7 and ends around November 3, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Swisher County, and when
- Start tipping out standing water weekly by March 24.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after November 3.
- 2 West Nile cases since 2016 (last 2023): you should use repellent at dusk June to August, more so if over 60.
Swisher County against the rest of TX
Swisher County has the 244th longest season of 254 TX counties, at 210 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 57.2°F.
- Roberts County: April 5 to November 3 (212 days, 1 WNV)
- Oldham County: April 7 to November 3 (210 days, 0 WNV)
- Armstrong County: April 8 to October 31 (206 days, 1 WNV)
- Moore County: April 10 to November 2 (206 days, 2 WNV)
West Nile in Swisher County
From 1999 to 2025, CDC ArboNET counted 23 human West Nile cases in Swisher County (8 neuroinvasive) across 8 years. The worst was 2003 with 13; the latest was 2023.
See how the dates are worked out, and when the season starts across the US.