There are two times a year you can trim knockout and drift roses, August and February. Trimming them now will promote new growth during the spring blooming season. You’ll want to cut them to about half their size with a hand pruner or a hedge trimmer.
When the new growth comes in, it will look deep red and eventually start to green up. Your roses will bloom from spring into fall, so you have plenty of time to enjoy them! If you have any questions, let us know!