The best time to prune roses is in late winter or early spring, around the time new growth begins. This could be as early as January or as late as May, depending on your climate.
When should roses be cut back and how much?
Most people in the Pacific Northwest prune their roses in either late February or early March. California growers typically "spring prune" in January. Midwest patrons may have to wait until early May.
Can I prune roses in November?
When should you prune roses? Winter is regarded as the best season to prune most types of roses, so you may be able to prune roses in November or December. However Gardeners' World state rambling roses should be pruned in the summer, immediately after they have flowered.