Is Green Panda Bamboo Evergreen in My Zone?

The Fargesia rufa 'Green Panda' bamboo that I transplanted outside this Spring is going strong, and is holding its deep green color. It's almost December! I'm wondering if this green panda is supposed to be evergreen in my zone 6a here in central Indiana.

Fargesia rufa 'Green Panda' looking very green on November 29, 2015 in Zone 6a

Every source I can find says that it is indeed cold hardy to zone 5, but I haven't seen anything about it being evergreen. It's certainly doing better than my Japanese painted fern that took a poop at the first snowfall!

Japanese painted fern - Athyrium nipponicum 'Pictum' - decidedly not of the evergreen persuasion