That's an excellent and very practical question! The short answer is: while no outdoor bench is 100% maintenance-free forever, there are benches available that come remarkably close, requiring minimal to almost zero upkeep for decades. The key is understanding what "zero-maintenance" really means in this context. It doesn't mean the bench will look brand new without any intervention, but rather that it won't rot, rust, splinter, or require painting, sealing, or staining to maintain its structural integrity.
The champions of low upkeep are benches made from specific modern materials. First, consider recycled plastic lumber (HDPE). These benches are made from durable plastics and are impervious to moisture, insects, and rot. They won't splinter, never need painting, and typically only require an occasional rinse with a hose. Next, look at powder-coated or galvanized steel/aluminum. A high-quality powder coat over aluminum or galvanized steel provides a incredibly tough finish that resists chipping, rust, and UV fading for years. Finally, pre-cast concrete benches are virtually indestructible and immune to weather, though they can develop a natural patina over time.
For a truly hands-off experience, avoid traditional wood (even pressure-treated), which always requires sealing, and be wary of cheap metals with thin paint coatings that will rust. When shopping, focus on commercial-grade or park-grade furniture, as it's built for durability in public spaces. So, while you may need to wipe off pollen or leaves, yes, you can find outdoor benches that free you from the endless cycle of sanding, staining, and repairing, allowing you to simply sit back and enjoy your garden or patio for years to come.