In general, most of the Alstromeria (Peruvian Lilies) are tropical, but I know of at least two (or more?) cultivars that are hardier than most - Tangerine Tango is one.
Name: Evan Pioneer Valley south, MA, USA (Zone 6a)
Mark Bridgen is doing his work on Long Island so his introductions should be hardy to at least z7. Zone 6 is indicated, however. Brent and Becky's, Walters and Garden Crossings are listing z5 or z6 depending on cv.
Mark Bridgen intros. I've found:
Tangerine Tango, Mauve Majesty, Sweet Laura
Name: Evan Pioneer Valley south, MA, USA (Zone 6a)
Maybe. I was hoping someone in z6 or even z5 had given one a try. There are a few micro-climates in my yard which are probably 6b (I'm right on the edge of 6a/5b), but there are too many z6 plants and only so much space. They should be right at home with you Sheryl.