Opinions vary as to exactly when is the best time to prune.
On the other hand, plants that are pruned in very late winter are often safer from late frost damage to their new growth. Both approaches are valid and have yielded excellent results for many gardeners. Do not be afraid to experiment with pruning schedules until you discover a routine that works well for your plants. Just remember that pruning is best carried out after the plants have settled completely into dormancy and before buds begin to expand into early spring growth. There are a few general instructions that apply to pruning established plants of any remontant rose variety.