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

Mosquito months in Harding County

In a normal year mosquito season in Harding County, NM starts around April 24 and ends around October 20, about 26 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 Harding County, and when

• Start tipping out standing water weekly by April 10.
• Book any yard treatment for late April, ahead of the July peak.
• Repellent can go away after October 20.
• No West Nile cases since 2016, so bites in Harding County are a nuisance; check window screens.

Harding County against the rest of NM

Harding County has the 21st longest season of 33 NM counties, at 179 days against 268 in Doña Ana County and 114 in Catron County. Its mean temperature is 54.5°F.

• Lincoln County: April 24 to October 24 (183 days, 3 WNV)
• Los Alamos County: April 21 to October 17 (179 days, 1 WNV)
• Sandoval County: April 26 to October 20 (177 days, 18 WNV)
• Union County: April 26 to October 17 (174 days, 4 WNV)

West Nile in Harding County

From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Harding County (0 neuroinvasive) across 1 year. The worst was 2014 with 1; the latest was 2014.

Background: when mosquitoes go away for the winter; how the dates are worked out.