The best thing is, if you have fridge space, put 'em in the fridge. They need to be reasonably somewhat wrapped so they don't shrivel all up, esp. if you have a frostfree fridge; but you don't want 'em to be damp and then sealed tightly into a plastic bag either. Use good judgement
If you do not have fridge space, get some potting soil WITH NO FERTILIZER IN IT (check the label carefully, many have fertilizer already incorporated into them, and you do not want that). Get it somewhat damp but not soggy. Bury the roses completely in the potting soil (I am assuming they are still dormant, no green bits starting to grow yet?). You can do this in an old potting soil bag, or washtub, or just whatever you have that will work. Put the whole shebang somewhere that will stay very cold but not freeze -- an unheated garage? Chicken coop (out of reach of chickens of course)? Against house foundation? Whatever you can arrange. Try to protect against mice, insofar as possible.
Either method should keep them dormant til you can do something with 'em.
(Afterthought -- by any chance is this a late snowfall, with thawed ground underneath it? If so, you can immerse them in potting soil and put under the snow if you don't have anywhere else. Don't do this if your ground is all frozen tho).
If there is already growth starting, you may be somewhat S.O.L. (there are things you can try, but they are not high-percentage tactics).
Good luck,
Pat