Experts and BHG readers answer.
Climbing rose has never bloomed
Thanks for writing. Do you know what type of rose it is? Some varieties aren't reliably hardy in Zone 5. It could be that the winters are too harsh for that particular type.
Also: Many climbing roses are grafted onto another rose's roots. If the top part of the rose dies, the roots kick in and start growing the type of plant they are. Many of these rootstock roses don't bloom much, if at all. Unfortunately, if this is the case, there's nothing you can do but replace your rose.
Is your rose growing near your lawn, and do you fertilize the lawn? If so, the rose might be absorbing the high-nitrogen lawn fertilizer and putting in lots of leafy growth at the expense of blooms. Feeding your rose with a more balanced fertilizer or cutting back on the amount of grass fertilizer you use in that corner of your yard might help.
Good luck. I hope this helps!
---Justin, Senior Garden Editor, BHG.com"