When is a good time to cut roses bushes back and how far back?
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Suggested Project Book
https://www.thespruce.com/roses-how-and-when-to-prune-1403040
February
In general, you will be pruning just before the plant breaks dormancy after spring's final frost. This will be early in the year in warm climates, and anytime between January and April in cold climates.
Please see the link below regarding how much to,prune to determine your personal need.
http://www.bhg.com/gardening/flowers/roses/tips-for-pruning-roses/