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

Mosquito months in Socorro County

In a normal year mosquito season in Socorro County, NM starts around March 31 and ends around November 3, about 31 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 Socorro County, and when

• Start tipping out standing water weekly by March 17.
• Book any yard treatment for late March, ahead of the July peak.
• Repellent can go away after November 3.
• 1 West Nile case since 2016 (last 2019): you should use repellent at dusk June to August, more so if over 60.

Socorro County against the rest of NM

Socorro County has the 8th longest season of 33 NM counties, at 217 days against 268 in Doña Ana County and 114 in Catron County. Its mean temperature is 57.8°F.

• Luna County: March 16 to November 13 (242 days, 5 WNV)
• Chaves County: March 31 to November 6 (220 days, 9 WNV)
• Bernalillo County: March 31 to November 1 (215 days, 87 WNV)
• De Baca County: April 3 to November 3 (214 days, 0 WNV)

West Nile in Socorro County

From 1999 to 2025, CDC ArboNET counted 7 human West Nile cases in Socorro County (1 neuroinvasive) across 4 years. The worst was 2003 with 4; the latest was 2019.

See how the dates are worked out, and when mosquitoes go away for the winter.