Great question! The short answer is: it depends on the wood. Some outdoor benches are naturally resistant to termites and other pests, while others need regular treatment to stay protected.
If your bench is made from teak, cedar, redwood, cypress, or white oak, you’re in luck. These woods contain natural oils, tannins, or resins that repel termites, carpenter ants, and wood-boring beetles. Teak is especially tough because its high oil content and density make it difficult for pests to chew through. Cedar and redwood also have aromatic compounds insects dislike. With these species, you usually don’t need chemical treatment for pest resistance—though the wood may weather to a silvery gray over time.
However, if your bench is made from pine, fir, spruce, acacia, eucalyptus, or other untreated softwoods, it is more vulnerable. Termites can tunnel through these woods easily, especially if the bench sits directly on soil or stays damp. These benches benefit from a wood preservative, borate treatment, or outdoor wood sealer applied every 1–2 years. Pressure-treated pine is an exception: it’s chemically treated to resist rot and insects, but you still need to seal cut ends and reapply a surface protectant as the outer layer wears down.
The finish matters too. A high-quality exterior varnish, oil, or polyurethane creates a physical barrier that pests must get through first. But no finish is permanent—UV rays, rain, and temperature changes cause cracks. Cracks trap moisture and give pests an entry point. So even naturally resistant benches need occasional cleaning and re-oiling or sealing to keep the wood healthy.
My practical advice: Check the label or product description for the wood species. If it says teak, cedar, redwood, or white oak, you can relax on pest control but still clean and oil it once a year. If it says pine, acacia, or eucalyptus, plan on a borate-based wood treatment before first use, then reseal every year or two. Keep the bench off direct soil—use feet or a stone base—and remove debris from joints. That will dramatically reduce termite and pest problems.
Bottom line: Many outdoor benches are pest resistant, but “resistant” is not the same as “proof.” With the right wood and basic maintenance, you won’t need to treat regularly for termites. With cheaper wood, yes—you’ll need to treat it to get long life.