Mosquito season in Montgomery County, TX: when it starts and ends
Mosquito months in Montgomery County
In a normal year mosquito season in Montgomery County, TX starts around February 2 and ends around December 23, about 46 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Montgomery County, and when
- Start tipping out standing water weekly by January 19.
- Book any yard treatment for early February, ahead of the August peak.
- Repellent can go away after December 23.
- 86 West Nile cases since 2016: you should wear EPA-registered repellent at dusk May to October, and check TX spray notices.
Montgomery County against the rest of TX
Montgomery County has the 39th longest season of 254 TX counties, at 324 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 69.3°F.
- Kenedy County: January 31 to December 22 (325 days, 0 WNV)
- Newton County: February 19 to January 10 (325 days, 1 WNV)
- Duval County: January 29 to December 18 (323 days, 0 WNV)
- Brooks County: January 31 to December 20 (323 days, 0 WNV)
West Nile in Montgomery County
From 1999 to 2025, CDC ArboNET counted 210 human West Nile cases in Montgomery County (158 neuroinvasive) across 23 years. The worst was 2014 with 32; the latest was 2025.
More: how the dates are worked out · reading the West Nile counts.