If you live in a rainy climate and want an outdoor bench that won’t demand constant care, the hands-down winner is plastic lumber—specifically recycled high-density polyethylene (HDPE). Unlike natural wood, which rots, warps, and attracts mold when soaked repeatedly, plastic lumber shrugs off moisture like a duck’s back. It never needs sealing, staining, or painting. A simple rinse with a garden hose is all the maintenance it requires, year after year.
Why does plastic lumber beat other options? Cedar and teak are popular for their natural rot resistance, but they still require annual oiling to prevent silvering and cracking. Metal benches (aluminum or powder-coated steel) can hold up in the rain, but they get ice-cold in winter, scorching hot in summer, and can rust if the coating chips. Plastic lumber, on the other hand, is designed to stay comfortable in all temperatures and is completely immune to water damage.
Another bonus: recycled plastic benches are often made from post-consumer waste like milk jugs, so you get an eco-friendly choice that lasts 25 to 50 years with zero effort. Just make sure you buy UV-stabilized material—otherwise, sunlight can fade the color over time. For a truly set-it-and-forget-it bench in a rainy climate, plastic lumber is the most low-maintenance, reliable, and user-friendly material you can pick.