Mosquito season in Armstrong County, TX: when it starts and ends
Mosquito months in Armstrong County
In a normal year mosquito season in Armstrong County, TX starts around April 8 and ends around October 31, about 29 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Armstrong County, and when
- Start tipping out standing water weekly by March 25.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 31.
- 1 West Nile case since 2016 (last 2023): you should use repellent at dusk June to September, more so if over 60.
Armstrong County against the rest of TX
Armstrong County has the 245th longest season of 254 TX counties, at 206 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 58°F.
- Oldham County: April 7 to November 3 (210 days, 0 WNV)
- Swisher County: April 7 to November 3 (210 days, 2 WNV)
- Moore County: April 10 to November 2 (206 days, 2 WNV)
- Castro County: April 10 to November 1 (205 days, 3 WNV)
West Nile in Armstrong County
From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Armstrong County (4 neuroinvasive) across 3 years. The worst was 2015 with 2; the latest was 2023.
More: how the dates are worked out · when the season starts across the US.