Mosquito season in Medina County, TX: when it starts and ends

Mosquito months in Medina County

In a normal year mosquito season in Medina County, TX starts around February 12 and ends around December 9, about 43 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in Medina County, and when

• Start tipping out standing water weekly by January 29.
• Book any yard treatment for mid February, ahead of the August peak.
• Repellent can go away after December 9.
• 1 West Nile case since 2016 (last 2025): you should use repellent at dusk May to October, more so if over 60.

Medina County against the rest of TX

Medina County has the 63rd longest season of 254 TX counties, at 300 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 69.6°F.

• Terrell County: February 11 to December 9 (301 days, 0 WNV)
• Polk County: February 14 to December 12 (301 days, 3 WNV)
• Fayette County: February 15 to December 10 (298 days, 0 WNV)
• DeWitt County: February 15 to December 9 (297 days, 0 WNV)

West Nile in Medina County

From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Medina County (1 neuroinvasive) across 1 year. The worst was 2025 with 1; the latest was 2025.

More: how the dates are worked out · when mosquitoes go away for the winter.