I have some that have come back 3 or 4 years now. One is not even in a very protected area. I'm thinking they are hardy in zone 7.

i bought these 2 years ago from HD & they have returned every year. i'm also on long island. nice 40 % off find :)

Generally considered marginally hardy in zone 7, like many bulbs with South African origin. Full sun and very well-drained soils should help with the success of overwintering. These are also excellent container plants that are easily stored over winter in less mild areas.

Here is a link that might be useful: Eucomis - pineapple lilies