New Rules Coming for Mushroom Grades: What You Need to Know

You might care about this because the U.S. government wants to update how mushrooms are officially graded. The Department of Agriculture's Agricultural Marketing Service (AMS) is proposing changes to the current U.S. Standards for Grades of Mushrooms. These standards are important because they help ensure consistent quality in the marketplace for growers, sellers, and consumers. The current rules are considered outdated and do not fully reflect how mushrooms are grown and handled today. The main goal of these proposed changes is to modernize the standards. This involves adding a new grade specifically for portabella mushrooms, which currently do not have their own federal grade. The proposal also plans to separate size requirements from the quality grade criteria, creating a distinct section just for mushroom sizes. This will make the grading process clearer. In addition, the AMS intends to revise the acceptable levels and types of defects, updating terminology and definitions to match current industry practices. For example, they are defining what counts as "bruising," "cuts," and "spots." These updates are the result of collaboration between the AMS and the American Mushroom Institute, an industry group that asked for these revisions. The public has an opportunity to submit comments on these proposed changes until June 9, 2026, before they are finalized. What is particularly interesting about this proposal is how it brings official government standards in line with modern mushroom farming and market trends. For the first time, there will be a specific U.S. grade for portabella mushrooms. This is a big step because portabellas have become very popular, but growers and distributors have lacked clear federal guidelines for their quality. Adding this new grade acknowledges their importance in the market. The plan to remove size specifications from the quality grades themselves is also notable. This change allows for more flexibility and a clearer distinction between a mushroom's size and its overall quality. A mushroom can still be considered high quality regardless of whether it is small or large, as long as it meets other standards. Furthermore, updating defect tolerances and definitions, such as recognizing "open veils" as a normal characteristic for portabellas but a potential defect for other types, shows a careful consideration of different mushroom varieties. The proposal also allows for "mixed specialty packs" of white and brown mushrooms, which reflects how they are often sold today. These revisions aim to create a more fair and accurate grading system for the industry. People who grow, package, distribute, or sell mushrooms will find this legal document highly relevant. Mushroom farmers, especially those who grow portabella or crimini varieties, need to understand these new grading standards to ensure their products meet official requirements. Businesses that pack and ship mushrooms will be directly affected by the revised defect tolerances and sizing guidelines. This includes knowing what is considered acceptable damage and how to classify different sizes. Retailers who sell mushrooms to consumers will also want to pay attention, as the new standards could influence product labeling and quality assurance. Beyond the immediate industry, food safety regulators and inspectors might be interested because these standards help maintain product quality and consistency in the food supply chain. Academic researchers or students studying agricultural economics or food science might also find this document valuable as an example of how government regulations adapt to industry changes. Finally, consumers who want to better understand how their food is graded and what quality standards are in place could find this information useful, even if indirectly.