Mosquito season in Colfax County, NM: when it starts and ends
Mosquito months in Colfax County
In a normal year mosquito season in Colfax County, NM starts around May 5 and ends around October 8, about 22 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Colfax County, and when
- Start tipping out standing water weekly by April 21.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 8.
- 1 West Nile case since 2016 (last 2023): you should use repellent at dusk July, more so if over 60.
Colfax County against the rest of NM
Colfax County has the 26th longest season of 33 NM counties, at 156 days against 268 in Doña Ana County and 114 in Catron County. Its mean temperature is 49.1°F.
- Santa Fe County: May 3 to October 16 (166 days, 14 WNV)
- Torrance County: May 5 to October 10 (158 days, 3 WNV)
- San Miguel County: May 10 to October 7 (150 days, 4 WNV)
- Mora County: May 11 to October 3 (145 days, 1 WNV)
West Nile in Colfax County
From 1999 to 2025, CDC ArboNET counted 9 human West Nile cases in Colfax County (6 neuroinvasive) across 4 years. The worst was 2003 with 6; the latest was 2023.
More: how the dates are worked out · when mosquitoes go away for the winter.