The lifespan of raised beds can vary depending on several factors such as the materials used, the level of maintenance, and the exposure to weather and other elements. Here are some general estimates for the longevity of different types of raised beds: ‌ Wood-raised beds: In general, a well-constructed and well-maintained wooden raised bed can last anywhere from 5 to 20 years. However, untreated softwood may only last for 3-5 years before rotting. ‌ Metal raised beds: Metal raised beds made of materials such as galvanized steel, aluminum or corten steel can last for decades, and often have a lifespan of 20-30 years or more. ‌ It's important to note that regular maintenance such as keeping the beds clean and free of debris and replacing deteriorating materials, can help extend the lifespan of your raised beds.