There’s no set schedule for when to rotate stock—every industry is unique, and every store has different needs. In general, consider the length of the demand cycle in your industry, and sell within that time frame. If the demand cycle is moderately long, and products and trends turn over every few years, try to rotate your stock every year to keep your offerings fresh. If your shop has seasonal offerings, such as apparel, you’ll want to rotate your stock before each change of season, or every three months.