If you aren't experienced, the safest time to dig is just after dormancy sets in but (obviously) before the ground freezes. In 5a, you may need to mound tender roses such as hybrid teas in addition to burying the graft a few inches, but opinions differ.

I would pile up the soil and mulch so the graft is buried and you'll have a raised bed.

Yes, as Henry suggests, it's OK to raise the grade for the whole area permanently.

Burying the bud union4-6 inches deep will help protect it but to help any exposed canes survive, you must provide some sort of protection for them also.
If they are growing well now, Leave then be and pile soil over them after the ground freezes. Covering is done to prevent the freeze/thaw cycle not keep the bud union or soil from freezing. A hard freeze causes moisture in the plant tissues to freeze and expand. It's when this moisture freezes that cell damage occurs. When a plant goes dormant it becomes less prone to cell damage so it's important to let the bush experience gradually colder temps to let it go dormant naturally. That's why you don't want to cover it until after the soil freezes in late fall or early winter.
I advise early spring transplanting. Fall transplanting doesn't give the bush any time to grow riits into the surrounding soil and the loose dirt in the planting hole will freeze before the compacted dirt of an established plant. Many fall planted bushes in our zone don't survive winter. Spring transplanting should be done while the bush is still dormant as soon as the soil can be worked and before the bush leafs out. It has all summer to get established before it's subject to cold weather.
I'd pile soil and mulch on them this year or you could build a raised bed which wouldn't require replanting them. Others planted correctly would end up a little deeper but they'd be fine once they adapted.

Thanks or all the replies, I think I will rake the dirt in to a mound once the cold weather sets in.

thanks
Jenn

No, you don't want to take the soil from over the roots. Bring in more soil from elsewhere.

Yes, Michael is right. Most rose rootsare in the top 4-6 inches of soil. Taking soil from around the bush can expose them just when they need the extra cover. Bring it in from another place or use pine straw or oak leaves to cover the bases this year.