If you are covering your roses with dirt, that is good winterization and should be enough for your area but only protects the part covered.
I now bury my roses but as it gets sub-zero here I also cover them with leaves in November. Because I bury them I now have some roses feet tall as I used to have to trm them down to twelve to sixteen inches to cover them with leaves.
I grew Austin roses and did not winterize them as I did my Hybrid Teas and within a few years they all died.
Beware of so called cold hardy roses, often that is wishful thinking.
