For Las Cruces, NM our USDA hardiness zone is: Zone 8a : 10 to 15 (F)
Sunset’s Gardening zone has Las Cruces at zone 10 or 2a for the mountain areas.
There is also Sunset’s Gardening zone: http://www.sunset.com/garden/climate-zones/climate-zones-intro-us-map
Click here to find your state or local hardiness zone ->Plant Hardiness Zone for Your State
Below is New Mexico’s Gardening Hardiness Zone Map.
Plant hardiness zone for your State