Mosquito season in Otero County, NM: when it starts and ends
Mosquito months in Otero County
In a normal year mosquito season in Otero County, NM starts around April 20 and ends around October 30, about 28 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Otero County, and when
- Start tipping out standing water weekly by April 6.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 30.
- 3 West Nile cases since 2016 (last 2025): you should use repellent at dusk June to July, more so if over 60.
Otero County against the rest of NM
Otero County has the 17th longest season of 33 NM counties, at 193 days against 268 in Doña Ana County and 114 in Catron County. Its mean temperature is 54.6°F.
- Curry County: April 8 to November 2 (208 days, 3 WNV)
- Valencia County: April 8 to October 31 (206 days, 20 WNV)
- San Juan County: April 17 to October 25 (191 days, 49 WNV)
- Lincoln County: April 24 to October 24 (183 days, 3 WNV)
West Nile in Otero County
From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Otero County (3 neuroinvasive) across 2 years. The worst was 2025 with 3; the latest was 2025.
Background: when mosquitoes go away for the winter; how the dates are worked out.