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

Mosquito months in Eddy County

In a normal year mosquito season in Eddy County, NM starts around March 5 and ends around November 18, about 37 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 Eddy County, and when

• Start tipping out standing water weekly by February 19.
• Book any yard treatment for early March, ahead of the July peak.
• Repellent can go away after November 18.
• 5 West Nile cases since 2016 (last 2025): you should use repellent at dusk May to September, more so if over 60.

Eddy County against the rest of NM

Eddy County has the 3rd longest season of 33 NM counties, at 258 days against 268 in Doña Ana County and 114 in Catron County. Its mean temperature is 63.5°F.

• Doña Ana County: February 26 to November 21 (268 days, 26 WNV)
• Sierra County: March 1 to November 20 (264 days, 0 WNV)
• Lea County: March 10 to November 23 (258 days, 6 WNV)
• Hidalgo County: March 11 to November 18 (252 days, 0 WNV)

West Nile in Eddy County

From 1999 to 2025, CDC ArboNET counted 13 human West Nile cases in Eddy County (9 neuroinvasive) across 8 years. The worst was 2025 with 4; the latest was 2025.

More: how the dates are worked out · reading the West Nile counts.