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

Mosquito months in De Baca County

In a normal year mosquito season in De Baca County, NM starts around April 3 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 De Baca County, and when

• Start tipping out standing water weekly by March 20.
• Book any yard treatment for early April, ahead of the July peak.
• Repellent can go away after November 3.
• No West Nile cases since 2016, so bites in De Baca County are a nuisance; check window screens.

De Baca County against the rest of NM

De Baca County has the 10th longest season of 33 NM counties, at 214 days against 268 in Doña Ana County and 114 in Catron County. Its mean temperature is 59.4°F.

• Socorro County: March 31 to November 3 (217 days, 1 WNV)
• Bernalillo County: March 31 to November 1 (215 days, 87 WNV)
• Quay County: April 4 to November 4 (214 days, 6 WNV)
• Grant County: April 6 to November 4 (212 days, 0 WNV)

West Nile in De Baca County

From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in De Baca County (1 neuroinvasive) across 3 years. The worst was 2003 with 2; the latest was 2014.

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