Certain modern climbing rose varieties do well in Zone 5 climates as long as they have adequate protection against winter weather. The gardener should not feed the plant after August so it has adequate time to harden off. In the process known as hardening off, the plant loses less water through its leaves and develops tougher, darker foliage to better withstand winter conditions.
The gardener should pull mulch away from the plant in late summer or early fall, and mix a bucket of compost or well-seasoned manure into the soil around the roots. Canadian Gardener recommends wrapping the canes in tarps to protect them from extreme cold or laying them on the ground and covering them with old carpet or leaves. At the end of winter, the canes can be raised to an upright position and staked.
Climbers should be lightly pruned, removing dead wood and stems that are narrower than a pencil. If allowed to grow vertically, climbing roses bloom only at the top of the stem. Canadian Gardening suggests bending the main stem horizontally to produce more blossoms. Roses planted against a brick wall enjoy a microclimate that is several degrees warmer than the surrounding soil, which extends the plant's blooming season. Two varieties that flourish in Zone 5 are Climbing Iceburg (also known as Climbing Schneewittchen) and Altissimo (R. Delmut), according to Canadian Gardener.