This recipe yields just over 1½ cups of salad dressing. Storage InstructionsHomemade Ranch dressing is perishable and needs to be stored in the refrigerator when not using.You can leave it out at room temperature for up to 2 hours.RefrigerationStore any leftover dressing in an airtight container in the fridge. Mason jars are great storage containers for dressings.The homemade ranch dressing will last up to 2 weeks when stored properly in the refrigerator. This time is based on the freshness of the ingredients you started with.For example if your cream and buttermilk are unopened and not nearing their expiration date when you make the ranch dressing, your dressing will stay fresh longer.FreezerI do not recommend freezing the ranch dressing.