Mosquito season in Hidalgo County, NM: when it starts and ends

Mosquito months in Hidalgo County

In a normal year mosquito season in Hidalgo County, NM 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 Hidalgo 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.
• No West Nile cases since 2016, so bites in Hidalgo County are a nuisance; check window screens.

Hidalgo County against the rest of NM

Hidalgo County has the 5th longest season of 33 NM counties, at 252 days against 268 in Doña Ana County and 114 in Catron County. Its mean temperature is 62.1°F.

• Eddy County: March 5 to November 18 (258 days, 5 WNV)
• Lea County: March 10 to November 23 (258 days, 6 WNV)
• Luna County: March 16 to November 13 (242 days, 5 WNV)
• Chaves County: March 31 to November 6 (220 days, 9 WNV)

West Nile in Hidalgo County

CDC ArboNET lists no human West Nile cases for Hidalgo County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 1 of those years.

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