Climbing roses in the winter go dormant. Their leaves drop, growth stops, and the canes harden to survive the cold. This isn't death. It's how these plants save energy underground until spring warmth tells them to start growing again. Every climbing rose in a cold climate goes through this cycle each year. You'll see it happen in your garden too if you grow in zones 7 or colder.
I've watched my zone 5 climbing roses go through this process enough times to know the pattern by heart. In November, the last leaves turn yellow and fall off. By December, the canes look bare and brown. January and February bring the worst cold, but the canes stay firm if the plant hardened off right in fall. Then around mid-March, I spot the first tiny red buds at the nodes. Within four weeks, the whole plant is covered in fresh green growth again.
Climbing roses winter dormancy runs on a stress hormone your plant makes in fall. Shorter days and cooler air trigger it. This hormone does three things. It stops all new growth so tender shoots don't get caught by frost. It thickens cell walls in the canes to resist ice damage. And it moves stored sugars down into the roots where they sit safe below the frost line. Those root reserves act as fuel for spring regrowth when the soil warms up.
Winterizing climbing roses protects the graft union and lower canes from freeze damage. Mound 10 to 12 inches (25 to 30 centimeters) of soil around the base of each plant. Add a thick layer of mulch on top after the ground freezes solid. The detail most gardeners miss is that wet cold does far more damage than dry cold. Good drainage around your rose's base matters as much as the mulch cover you put down.
Get your timing right for the best results. Start after the first hard freeze when nights drop below 28°F (minus 2°C) for a few hours. This lets the plant finish hardening on its own first. Don't wait too long though. Exposed graft unions can take damage once temps stay below 25°F (minus 4°C) for days. That window between the first hard freeze and steady deep cold is when you need to act.
In zones 6 and warmer, most climbing roses survive winter with no help. Cold-hardy William Baffin handles zone 3 at minus 35°F (minus 37°C) on its own. The roses that need the most cover are hybrid tea climbers and tender types at the edge of their zone range. Match your variety to your climate and you'll cut the winter prep work in half.
Pull back your winter cover in stages when spring arrives. Remove mulch and soil mounds over a two-week period as temps warm and frost risk drops. Stripping everything off on one warm day exposes tender new buds to late freezes. I take mine off in three rounds spaced a week apart. Watch the forecast, take it slow, and your climbing rose will push out strong spring growth and set you up for a full season of blooms.
Read the full article: Best Climbing Roses for Your Garden
