Below is a list of National Weather Service Zone Forecast codes for major ski resorts in the West. 

NWS_Resort_Forecast_Zones.pdf (65.00 kb)

Zone Forecast Discussions for Colorado can be found here: http://www.weather.gov/view/prodsByState.php?state=co&prodtype=zone

_{Tip of the hat to http://jlaccess.tripod.com/}

Colorado's zone map is located here: http://www.nws.noaa.gov/mirs/public/prods/maps/state_zone_colorado.htm