Does this help?

http://www.thegardenhelper.com/map/hzm-nm1.html

http://www.victoryseeds.com/frost/ia.html

Determine the days to maturity for the crop (you may not want it fully mature and it may be partially frost hardy). Pick your first frost date from the chart and your hardiness zone from the map. Then decide if you're close to having the crop develop before it gets frosted.

Dan O.