Echinocereus coccineus Red Rock NM
Echinocereus coccineus from Red Rock, NM is kind of the border land between var. rosei and regular coccineus in NM. Regardeless these plants can take some serious cold taking -22F in our garden without issue. Plants are generally taller than Colorado forms.
I do not guarantee these in a zone 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.