Mine are in a 9a with only shade cloth over them and they do fine...if it gets to cold I use smudge pots

I've been growing some here in the UK for a few years, Billbergia nutans, Fasciularia bicolor,Puya Berteroniana, Chilensis, Mirabliis with no problems.

This year I got ,Nidularium fulgens,Aechmea recurvata'' Aztec gold'' .Dyckia, Remotifolia , Frigida and a Greigia sphacelata all waiting for places to be planted

There are still a few others I'm after but they are hard to come by here.

Look at the list, all those listed as surviving 20F or lower should be worth a try.
Here in Rome, zone 9a, A. caudata, distichantha,ornata, recurvata, N. spectabilis, Q. arvensis, T. aeranthos, T. bergeri are long term survivers
Tomas

Here is a link that might be useful: cold hardiness

The weakness of the cold hardy lists are micro climate arent taken into consideration and there are many ways to create those.

i have been growing billbergia nutans, billbergia distachia, aechmea distachantha, dyckia chloristaminae, tillandsia recurvata (its reseeding) in central alabama. i plan to try more this spring.

Thanks for all the info everyone.