Most commercially packaged ranch dressing packets that you receive at fast-food restaurants or purchase from stores are designed to be shelf-stable, meaning they do not require refrigeration before opening. These single-serving packets contain ingredients that have been processed and packaged in a way that allows them to remain safe and suitable for consumption at room temperature for an extended period.
Before opening the packet, it can be stored in a cool, dry place, like a pantry or cupboard. Once opened, if you don't use the entire contents, it's best to refrigerate the leftover dressing in a sealed container to maintain its freshness. If you're uncertain about the specific storage instructions for a particular brand or type of ranch dressing packet, you can refer to the packaging, as it often provides storage guidance.
It's important to note that different brands or homemade ranch dressings may have different ingredients, and some variations might require refrigeration before opening. Always follow the specific instructions on the packaging to ensure the product remains safe to eat. When in doubt, it's safer to refrigerate any perishable dressings or sauces to prevent spoilage and potential foodborne illnesses.