Echinocereus pacificus ssp. mombergianus
Echinocereus pacificus ssp. mombergianus is a rare species of claret cup cactus from Baja California. It is likely a zone 6b or 7 plant. It likes fast drainage. Seed was from south of Pedro Martin, BCS, MX.
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.