Hey, great question. The short answer is: it depends entirely on what the bench is made of and how it's designed.
If you're looking at a typical metal bench—especially one with tubular steel or aluminum edges—skateboarders grinding on them will quickly leave deep scratches, gouges, and eventually weaken the structural integrity. Those benches are not built to take that kind of repetitive force. The grinding action wears down the coating, exposes raw metal, and can lead to rust or even bent frames over time.
Concrete benches? Those are a different story. Solid concrete or stone benches can take a lot of abuse. Skateboarders might leave visible scuff marks or chip the edges slightly, but the bench itself rarely fails. The main issue is that concrete is heavy and brittle, so repeated grinding on a thin edge could crack it—but that's uncommon.
Wooden benches? Oh, they're the most vulnerable. Wood splinters, cracks, and rots once the protective seal is broken by grinding. A few good sessions and you'll see exposed grain, jagged edges, and eventually the bench becomes unsafe to sit on.
Then there's the anti-skateboard design movement. Many cities now install benches with all sorts of tricks: angled surfaces, metal studs, or "skatestoppers" that prevent grinding altogether. Those benches hold up fine because they literally make grinding impossible. But they also look kind of aggressive and unwelcoming.
So, will the benches hold up? If they're cheap metal or wood, no—they'll show wear within weeks. If they're heavy-duty stone or specifically engineered to resist grinding, they might last years. But honestly, no bench is truly "skate-proof." It's a constant battle between public seating and skate culture.