Can I cut back my roses in winter?

Babette
by Babette

We have a lot of rose bushes that were getting very over-grown and untidy, but let them go in the fall. Now it is January (and sunny, no snow) and they are so bare (and for the most part, thornless, hooray) we are wondering if it is okay to cut them back at this time? They are all "knockout" rose bushes, by the way.

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