How long a park, porch, or other outdoor benches last has multiple variables- from the way it’s cared for, to the climate and materials used. A well-kept porch bench or park bench can last over ten years, but you’ll get far fewer years if you select a metal that rusts or untreated wood that warps. Another possible issue for wooden benches is deterioration in insect-heavy areas. For this reason, it’s always important to select materials that make sense for the climate (and upkeep you’re willing to adhere to).