Mosquito season in Callahan County, TX: when it starts and ends
Mosquito months in Callahan County
In a normal year mosquito season in Callahan County, TX starts around March 14 and ends around November 16, about 35 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Callahan County, and when
- Start tipping out standing water weekly by February 28.
- Book any yard treatment for mid March, ahead of the July peak.
- Repellent can go away after November 16.
- 2 West Nile cases since 2016 (last 2023): you should use repellent at dusk May to September, more so if over 60.
Callahan County against the rest of TX
Callahan County has the 183rd longest season of 254 TX counties, at 247 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 64.6°F.
- Baylor County: March 12 to November 15 (248 days, 0 WNV)
- Sutton County: March 13 to November 16 (248 days, 0 WNV)
- Jack County: March 14 to November 16 (247 days, 0 WNV)
- Erath County: March 15 to November 17 (247 days, 2 WNV)
West Nile in Callahan County
From 1999 to 2025, CDC ArboNET counted 8 human West Nile cases in Callahan County (5 neuroinvasive) across 4 years. The worst was 2003 with 5; the latest was 2023.
More: how the dates are worked out · when mosquitoes go away for the winter.