When is the best time to cut back your knock-out roses??
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Nco23343256
we live in zone 4 and we had a cold winter
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late winter to early spring before the new growth starts to emerge
this may help
https://www.wikihow.com/Prune-Knockout-Roses
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.
http://www.bhg.com/gardening/flowers/roses/tips-for-pruning-roses/