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.
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https://www.gardeningknowhow.com/ornamental/flowers/knockout-roses/prune-knockout-roses.htm
South Jan /Feb. Up north march
After the first dreez
You can trim Knock-outs anytime of the year in the South. not so sure about your location.
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/