Your 5-year-old Don Juan climber's reluctance to leaf out on its main canes after a zone 5 winter is characteristic of this variety's marginal hardiness in your area.
Don Juan is considered a "tender climber"—it survives zone 6 reliably but struggles in zone 5 without protection. The horizontal canes on your fence are most exposed to winter wind and temperature extremes, making them vulnerable to dieback.
After harsh winters, canes often deceive: some that look dead (brown, brittle) resprout from latent buds, while others that appear green may be dead inside. The only reliable approach is patience.
Even if main canes are lost, Don Juan often regenerates vigorously from the base. The new basal shoots can be trained to replace the old framework. This rose's exquisite blooms are worth the extra patience it demands in marginal zones.
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