Honestly, it depends entirely on what that bench is made of. I’ve seen cheap pine benches start rotting within two years near the shore, while a well-built teak or aluminum bench can last decades without much fuss. Salt air is brutal—it accelerates rust on ferrous metals, dries out and cracks untreated wood, and can even degrade some plastics that aren’t UV-stabilized.
If your bench has any iron or standard steel hardware or frame, expect surface rust to appear quickly. You’ll need to repaint or treat it every season, and even then, the salt will find its way into joints and fasteners. Stainless steel (316 marine grade, not 304) holds up much better, but it costs more upfront.
Wood benches are trickier. Cedar and redwood have natural oils that resist rot, but they still weather to a silvery gray and can get rough from salt crystals. Teak and shorea are the gold standard for coastal furniture—dense, oily, and naturally resistant to both moisture and salt. White oak is another decent choice, but skip pine, fir, or untreated poplar.
If you want zero maintenance, look for benches made from HDPE (high-density polyethylene) lumber, like the recycled plastic boards used in many boardwalks. They don’t absorb salt, won’t rust, and clean up with a hose. Powder-coated aluminum frames with HDPE slats are my top pick for oceanfront parks. Just make sure the powder coating is thick and the hardware is stainless.
Bottom line: don’t buy a random bench and hope for the best. Check the material tag or product description for “marine grade,” “316 stainless,” “teak,” “shorea,” or “HDPE.” If it just says “wood” or “metal” without specifics, assume it will struggle within a few years of constant salt air. A little research now saves you from hauling a corroded, splintered mess to the dump later.