If there are shoots coming up the root ball is still alive and it is possible for it to come back. It will, of course, take time for it to regrow to it's old stature but it can.

Thanks seil! Should I try pruning the dead wood out now then? How close to the ground should I go?

Are any of your roses starting to bud out yet? If not then wait until they start. If they are and you don't see any leaf buds fattening on it yet I'd go ahead and cut the dead canes right out. But be careful. Towards the bottom the cane may look dark brown and barky but still be alive. Old canes will get that bark look but still be viable. So go by the inside of the pith and cut down to where it is a clear white with a greenish ring just inside the bark.

My William Baffin just laughed off the cold and is leafing out wonderfully. My Livin Easy rose is growing from the ground as all the upper canes look dead and my knockouts are doing the same. All upper canes above the ground look dead with new growth coming from the ground level

Westerland endured a tough winter here. Not as tough as yours though. Some dead cane. Some alive to the top.

What's important is that the regrowth has been uneven, Some canes looked bad but had late growth. Others looked OK, then died. Meanwhile, there is lots of new growth coming from the base.

I agree with Seil. Give it a few more weeks. Then prune out the dead wood. Even if you are down to 6", Westerland will recover quickly and add 4 or 5 feet of cane by mid summer as mine does every year here.