I live in the NOrtheast and have always cut my roses back in te early Spring
Late March or early April would be a good time. they will do fine and become vigerous
If you cut in the fall you are just opening up problems with winter freezing/thawing which
may kill portions of the rose. Leaving plenty of length in the stem of the rose allows dieback naturally and then go ahead and do your pruning in the Spring. At the same
time you can also fertilize.