When is the best time to trim and transplant forever roses?
Baltimore County Maryland
We are not sure what you mean by 'forever roses'?
Here is one of our Extension publications on roses that may be helpful, which includes pruning information: https://extension.umd.edu/sites/extension.umd.edu/files/_images/programs/hgic/Publications/non_HGIC_...
Generally pruning and transplanting is done in early spring.
Here is a video on rose pruning as well: https://www.youtube.com/watch?v=e1DQskRx4xc&feature=youtu.be