Hidden Valley Ranch products can typically last in the refrigerator for about one to two months after opening. It is important to ensure that the bottle is securely sealed when not in use, as this helps to maintain freshness. Additionally, users should always check the product for signs of spoilage, such as an off smell, changes in color, or any separation that may not mix back in. The specific shelf life may vary depending on individual storage practices and environmental conditions, so it is best to refer to the "best by" or "use by" date printed on the bottle. For any further questions or specific inquiries regarding product storage, users may want to visit the official Hidden Valley Ranch website, where they can find additional information and guidance.