Thanks for writing. Most rhododendrons don't take very well to heavy pruning, so I'd cut them back lightly --- don't cut branches past where their leaves start.
As for timing, because most varieties bloom on year-old stems, you'll want to prune them back within a month or so after they finish blooming. That way they have plenty of time to make next year's flowers. If you cut them back in summer, winter, or early spring, you could be cutting off the blooms before they get a chance to open.
---Justin, Senior Garden Editor, BHG.com
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