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

Mosquito months in Guadalupe County

In a normal year mosquito season in Guadalupe County, TX starts around February 4 and ends around December 8, about 44 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 Guadalupe County, and when

• Start tipping out standing water weekly by January 21.
• Book any yard treatment for early February, ahead of the August peak.
• Repellent can go away after December 8.
• 1 West Nile case since 2016 (last 2018): you should use repellent at dusk May to October, more so if over 60.

Guadalupe County against the rest of TX

Guadalupe County has the 59th longest season of 254 TX counties, at 307 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 68.7°F.

• Gonzales County: February 6 to December 12 (309 days, 1 WNV)
• Waller County: February 11 to December 16 (308 days, 4 WNV)
• Atascosa County: February 10 to December 10 (303 days, 0 WNV)
• Terrell County: February 11 to December 9 (301 days, 0 WNV)

West Nile in Guadalupe County

From 1999 to 2025, CDC ArboNET counted 8 human West Nile cases in Guadalupe County (5 neuroinvasive) across 5 years. The worst was 2012 with 4; the latest was 2018.

See how the dates are worked out, and when mosquitoes go away for the winter.