In his talk at the CRFG Fruit Festival last year, Jon Verdick had this to say about it (
http://webebananas.com/FESTIVAL%20OF...%20Handout.pdf )
Joe Real's Cold Hardy List, from most hardy to least:
California Gold
Thousand Fingers
Monkey Fingers
Orinoco
Brazilian
Golden Rhinohorn
Dwarf Orinoco
Dwarf Brazilian
Misi Luki
Mysore
Namwah
Raja Puri
Manzano
Ice Cream
Gold Finger
Dwarf Namwah
Sweetheart
Namwah Pearl
Praying Hands
Saba
Cardaba
Williams
Belle
Valery
Generally. Red bananas are less cold tolerant (Tall Red, Dwarf Red,
Cuban Red, Kru Red Iholena, Red Green, Dwarf Red Green, Rose), though
some green bananas are fairly tender as well, such as Kumunamba and Kofi.
Most Reds will barely survive mid 40's for extended periods. Flowering, in winter (induced by an unusually warm week), or after a long winter can impact fruiting (size and quantity).