Take the possibility of rainfall and flash flooding seriously when hiking the canyons of Northern Arizona. It is a good idea before you hike to study maps to identify possible escape routes. Be especially careful hiking the Grand Canyon, Marble Canyon, and Glen Canyon regions.
Own-root roses are propagated by rooting stem cuttings of one variety of rose. From the band size pots tyically sold, the plants will put out a few new full-sized canes each year and then reach mature height and width in 2-5 years, depending on the variety.
Similarly if they are own root roses, they may come back. I would suggest that you contact one of the rose societies in New Jersey and ask for their advice. Perhaps there is someone close by who could come have a look at your plants.I'm including a link to the West Jersey Rose Society which appears to have an excellent rose advice page. If your plants are dead, don't despair, get some local advice and try again. Perhaps try some varieties that are more cold tolerant.o check, carefully dig some soil away around the base of the roses until you can see the graft. If there is sound growth below the soil, your roses should come back just fine. If they are alive, cover them back to their original depth and leave them. I personally would not do anything to them until you see new growth.