At our outdoor bench factory, we give a realistic range rather than one guaranteed number. If a cedar bench is left completely uncovered outside and receives no regular oiling or sealing, the expected lifespan is usually 8 to 12 years. In mild, dry climates with good airflow and a raised base, a well-built western red cedar or eastern white cedar bench can remain structurally sound for 10 to 15 years. In hot, humid, rainy, or freeze-thaw climates, or if the legs sit directly on soil, 5 to 8 years is more realistic before rot, splitting, or joint failure becomes serious. Uncovered exposure means UV graying, repeated wet-dry cycles, and moisture trapped in end grain, joints, and feet. The bench will not fail all at once; it will gray, check, loosen, and soften at contact points first. To maximize lifespan without a cover, set it on concrete or pavers, keep feet off soil, ensure drainage, and oil it annually. If you leave it fully exposed and do nothing, expect roughly a decade of useful service from a well-made cedar bench, with the first 5 to 8 years looking good and the later years requiring inspection. Normal weathering and rot from uncovered outdoor use are not manufacturing defects.