Aloe tomentosa is a arabic species of aloe from very high elevations. They have survived 0F in my garden now more than once. They look very similar to Aloe vera but get furry flowers and grow very fast once in the ground or a larger container.
I do not guarantee these in a zone 4/5/6/7 because everyones growing conditions are different but this would be a good trial plant to grow in your cold outdoor garden. Try to plant outdoor 90 days before 1st hard freeze.