Lawn mower belts typically last between 3 to 5 years, depending on usage and maintenance. If you notice fraying, cracks, or a stretched belt that doesn't sit snugly on the pulleys, it's time for a replacement. Keeping the belt clean and free of debris will help extend its lifespan. Investing in a durable can also reduce wear and tear over time. Waiting until a belt completely fails can leave you stuck mid-mow, so it's better to replace it at the first signs of wear. Checking the belt regularly and keeping pulleys in good condition will ensure smooth operation.