Should climbing roses be trimmed back the...

Yes, but avoid pruning them too much. Novice rose growers often make that mistake. Climbing varieties usually fare better with light pruning. Generally, you should trim them after they bloom, to make room for new blooms. Different varieties behave differently, though, so you should consult your local nursery to find out what is best for your variety. No rose will bloom well if its blossoms don’t get enough sunshine and air because they are too crowded.