Is there a cold hardy durian ,,
No such thing as far as I know.
ooh ,, 60 ,, then no way, and i think its hard too inside a green house.
If you had the time and space you could try planting a few thousand durian seeds from different cultivars and hope that maybe one will be more cold tolerant. Then you patent that cultivar and swim in the short lived profits which will probably not cover your expenses for development and experimentation.
Ultra tropical. Might survive low temps here and there for a short period. If temps fall consistenly below 60, then they will start to decline. Heat and humidity are required.
lol @ murahilin ,, thx for the precious advice :D