North from Taos to Ft. Garland, then over to Alamosa, or alternately cross the gorge to Tres Piedras and head north to Alamosa that way - six of one or half dozen of the other. From Alamosa head north through Leadville and pick up I-70. Indepenence Pass is closed in the winter.
You can also reference this thread for more info. http://forums.epicski.com/showthread.php?t=47877