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I wasn't entirely sure if my little moso seedling would survive it's first winter outside but it managed to pull through and is shooting before any of my other running bamboo!

http://imgur.com/gallery/e5r0UB9

Nice. How cold did it get over in your part of the world?

I believe the coldest we got was anywhere from - 15°C to maybe - 20°C when that winter vortex came through.

Roots and rhizomes can handle some cold, but on the long run, Moso will suffer if temperatures drop to - 20°C.
We've had warm winter here and my Moso seedling that suffered last few winters furiously exploded.
In marginal climates, you can only hope for a decent snow cover which protects the bamboo. It gets way too large and it's not easy to tarp the beast to the ground, snow is the only way. I mulched area around it a few years ago which attracted rodents, so I stopped that as well.

With age, it becomes more hardy. - 15°C could defoliate it this year, but in a year or two, it should handle it without much hassle.