Geno, A neighbor of yours just over the hill near Adin puts her plants in a wheelbarrow/garden cart thing. Wheels 'em out to the south face of the house for day sun, wheels 'em in at night. Not too much of a hassle compared with covering and uncovering. She is right at 4.400 feet.
Does she have a heated shed or space in the heated garage for them. Our garage was something like 13F this morning when the wife went out to it.