Looks like it won't take below 30 ! I found this on Google
larger image Beaumontia grandiflora 'Easter Lily Vine'
$3.25
This lovely vine is grown for the 6 inch, pristine white trumpet-shaped flowers that have the added bonus of having a delightful tropical fragrance. Huge, glossy, dark green leaves showcase lily-like blooms on a 10-20 foot woody vine in full to part sun and moist, well drained soil. Hardy to 30 F. Pkt. 6