I live in E. WA, and only a few of my roses are growing well. The rest are still waking up, and when you look you can see the new growth under the mulch.

Can you see any green on the canes at all?  If there is green there is hope. Mound them with some kind of compost or mulch and keep them watered. Cut out all of the dead wood if you haven't all ready.

It's really too early to count them out completely. If you aren't seeing any growth by mid-June, then they probably didn't make it through the Winter.  If you have to remove them  take care to get as much of the roots as you can. The rootstock can start to grow years after you've removed the rose.

Best of Luck