The exact shelf life of BBQ sauce can vary depending on the ingredients and how it's been stored, but in general, opened bottles of BBQ sauce should be used within 3-6 months. Unopened bottles can last up to a year or longer. To ensure that your BBQ sauce stays fresh, it's important to store it in the refrigerator, keep the lid tightly closed, and avoid cross-contamination by using a clean utensil each time you use it. If you notice any signs of spoilage, such as a change in color, consistency, or odor, it's best to discard it.