Another one bites the dust?

I knew that I was taking a chance when I first planted my Viburnum plicatum tomentosum 'Shasta' in 2000. I knew that it was rated as a Zone 5b plant at best (most sources said Zone 6), but our winters had been mild and I guess that I wanted to believe that they would stay that way. And for six years, they did.

During those six years, the 'Shasta' grew into a gorgeous focal point in the outer border. For several weeks in May, it was smothered in large, white lacecap inflorescences, but its architectural beauty captivated me anytime I glanced in the shrub's direction.

Then, last year, a couple days of below zero weather killed a good third of those striking stems. And now, with our most recent temperatures, I'm wondering if there will be anything left come spring.