Mosquito season in Madison County, TX: when it starts and ends
Mosquito months in Madison County
In a normal year mosquito season in Madison County, TX starts around March 2 and ends around November 20, about 38 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Madison County, and when
- Start tipping out standing water weekly by February 16.
- Book any yard treatment for early March, ahead of the August peak.
- Repellent can go away after November 20.
- No West Nile cases since 2016, so bites in Madison County are a nuisance; check window screens.
Madison County against the rest of TX
Madison County has the 139th longest season of 254 TX counties, at 263 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 67.1°F.
- Henderson County: March 5 to November 24 (264 days, 9 WNV)
- Johnson County: March 6 to November 25 (264 days, 17 WNV)
- Gillespie County: March 4 to November 22 (263 days, 0 WNV)
- Red River County: March 5 to November 23 (263 days, 2 WNV)
West Nile in Madison County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Madison County (0 neuroinvasive) across 1 year. The worst was 2012 with 1; the latest was 2012.
See how the dates are worked out, and when the season starts across the US.