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

Mosquito months in Somervell County

In a normal year mosquito season in Somervell County, TX starts around March 11 and ends around November 18, about 36 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 Somervell County, and when

• Start tipping out standing water weekly by February 25.
• Book any yard treatment for mid March, ahead of the July peak.
• Repellent can go away after November 18.
• 1 West Nile case since 2016 (last 2025): you should use repellent at dusk May to September, more so if over 60.

Somervell County against the rest of TX

Somervell County has the 175th longest season of 254 TX counties, at 252 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 64.7°F.

• Martin County: March 10 to November 18 (253 days, 2 WNV)
• Midland County: March 10 to November 18 (253 days, 9 WNV)
• Loving County: March 10 to November 16 (251 days, 0 WNV)
• Wichita County: March 12 to November 18 (251 days, 13 WNV)

West Nile in Somervell County

From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Somervell County (0 neuroinvasive) across 1 year. The worst was 2025 with 1; the latest was 2025.

See how the dates are worked out, and when the season starts across the US.